diff --git a/mysql-test/suite/innodb_plugin/r/innodb_bug53756.result b/mysql-test/suite/innodb_plugin/r/innodb_bug53756.result
new file mode 100644
index 00000000000..37453be8201
--- /dev/null
+++ b/mysql-test/suite/innodb_plugin/r/innodb_bug53756.result
@@ -0,0 +1,118 @@
+DROP TABLE IF EXISTS bug_53756 ;
+CREATE TABLE bug_53756 (pk INT, c1 INT) ENGINE=InnoDB;
+ALTER TABLE bug_53756 ADD PRIMARY KEY (pk);
+INSERT INTO bug_53756 VALUES(1, 11), (2, 22), (3, 33), (4, 44);
+
+# Select a less restrictive isolation level.
+SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED;
+SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
+COMMIT;
+
+# Start a transaction in the default connection for isolation.
+START TRANSACTION;
+SELECT @@tx_isolation;
+@@tx_isolation
+READ-COMMITTED
+SELECT * FROM bug_53756;
+pk	c1
+1	11
+2	22
+3	33
+4	44
+
+# connection con1 deletes row 1
+START TRANSACTION;
+SELECT @@tx_isolation;
+@@tx_isolation
+READ-COMMITTED
+DELETE FROM bug_53756 WHERE pk=1;
+
+# connection con2 deletes row 2
+START TRANSACTION;
+SELECT @@tx_isolation;
+@@tx_isolation
+READ-COMMITTED
+DELETE FROM bug_53756 WHERE pk=2;
+
+# connection con3 updates row 3
+START TRANSACTION;
+SELECT @@tx_isolation;
+@@tx_isolation
+READ-COMMITTED
+UPDATE bug_53756 SET c1=77 WHERE pk=3;
+
+# connection con4 updates row 4
+START TRANSACTION;
+SELECT @@tx_isolation;
+@@tx_isolation
+READ-COMMITTED
+UPDATE bug_53756 SET c1=88 WHERE pk=4;
+
+# connection con5 inserts row 5
+START TRANSACTION;
+SELECT @@tx_isolation;
+@@tx_isolation
+READ-COMMITTED
+INSERT INTO bug_53756 VALUES(5, 55);
+
+# connection con6 inserts row 6
+START TRANSACTION;
+SELECT @@tx_isolation;
+@@tx_isolation
+READ-COMMITTED
+INSERT INTO bug_53756 VALUES(6, 66);
+
+# connection con1 commits.
+COMMIT;
+
+# connection con3 commits.
+COMMIT;
+
+# connection con4 rolls back.
+ROLLBACK;
+
+# connection con6 rolls back.
+ROLLBACK;
+
+# The connections 2 and 5 stay open.
+
+# connection default selects resulting data.
+# Delete of row 1 was committed.
+# Update of row 3 was committed.
+# Due to isolation level read committed, these should be included.
+# All other changes should not be included.
+SELECT * FROM bug_53756;
+pk	c1
+2	22
+3	77
+4	44
+
+# connection default
+#
+# Crash server.
+START TRANSACTION;
+INSERT INTO bug_53756 VALUES (666,666);
+SET SESSION debug="+d,crash_commit_before";
+COMMIT;
+ERROR HY000: Lost connection to MySQL server during query
+
+#
+# disconnect con1, con2, con3, con4, con5, con6.
+#
+# Restart server.
+
+#
+# Select recovered data.
+# Delete of row 1 was committed.
+# Update of row 3 was committed.
+# These should be included.
+# All other changes should not be included.
+# Delete of row 2 and insert of row 5 should be rolled back
+SELECT * FROM bug_53756;
+pk	c1
+2	22
+3	77
+4	44
+
+# Clean up.
+DROP TABLE bug_53756;
diff --git a/mysql-test/suite/innodb_plugin/t/innodb_bug53756-master.opt b/mysql-test/suite/innodb_plugin/t/innodb_bug53756-master.opt
new file mode 100644
index 00000000000..425fda95086
--- /dev/null
+++ b/mysql-test/suite/innodb_plugin/t/innodb_bug53756-master.opt
@@ -0,0 +1 @@
+--skip-stack-trace --skip-core-file
diff --git a/mysql-test/suite/innodb_plugin/t/innodb_bug53756.test b/mysql-test/suite/innodb_plugin/t/innodb_bug53756.test
new file mode 100644
index 00000000000..0623be1d0ae
--- /dev/null
+++ b/mysql-test/suite/innodb_plugin/t/innodb_bug53756.test
@@ -0,0 +1,184 @@
+# This is the test case for bug #53756. Alter table operation could
+# leave a deleted record for the temp table (later renamed to the altered
+# table) in the SYS_TABLES secondary index, we should ignore this row and
+# find the first non-deleted row for the specified table_id when load table
+# metadata in the function dict_load_table_on_id() during crash recovery.
+
+#
+# innobackup needs to connect to the server. Not supported in embedded.
+--source include/not_embedded.inc
+#
+# This test case needs to crash the server. Needs a debug server.
+--source include/have_debug.inc
+#
+# Don't test this under valgrind, memory leaks will occur.
+--source include/not_valgrind.inc
+#
+# This test case needs InnoDB.
+-- source include/have_innodb_plugin.inc
+
+#
+# Precautionary clean up.
+#
+--disable_warnings
+DROP TABLE IF EXISTS bug_53756 ;
+--enable_warnings
+
+#
+# Create test data.
+#
+CREATE TABLE bug_53756 (pk INT, c1 INT) ENGINE=InnoDB;
+ALTER TABLE bug_53756 ADD PRIMARY KEY (pk);
+INSERT INTO bug_53756 VALUES(1, 11), (2, 22), (3, 33), (4, 44);
+
+--echo
+--echo # Select a less restrictive isolation level.
+# Don't use user variables. They won't survive server crash.
+--let $global_isolation= `SELECT @@global.tx_isolation`;
+--let $session_isolation= `SELECT @@session.tx_isolation`;
+SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED;
+SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
+COMMIT;
+
+--echo
+--echo # Start a transaction in the default connection for isolation.
+START TRANSACTION;
+SELECT @@tx_isolation;
+SELECT * FROM bug_53756;
+
+--echo
+--echo # connection con1 deletes row 1
+--connect (con1,localhost,root,,)
+START TRANSACTION;
+SELECT @@tx_isolation;
+DELETE FROM bug_53756 WHERE pk=1;
+
+--echo
+--echo # connection con2 deletes row 2
+--connect (con2,localhost,root,,)
+START TRANSACTION;
+SELECT @@tx_isolation;
+DELETE FROM bug_53756 WHERE pk=2;
+
+--echo
+--echo # connection con3 updates row 3
+--connect (con3,localhost,root,,)
+START TRANSACTION;
+SELECT @@tx_isolation;
+UPDATE bug_53756 SET c1=77 WHERE pk=3;
+
+--echo
+--echo # connection con4 updates row 4
+--connect (con4,localhost,root,,)
+START TRANSACTION;
+SELECT @@tx_isolation;
+UPDATE bug_53756 SET c1=88 WHERE pk=4;
+
+--echo
+--echo # connection con5 inserts row 5
+--connect (con5,localhost,root,,)
+START TRANSACTION;
+SELECT @@tx_isolation;
+INSERT INTO bug_53756 VALUES(5, 55);
+
+--echo
+--echo # connection con6 inserts row 6
+--connect (con6,localhost,root,,)
+START TRANSACTION;
+SELECT @@tx_isolation;
+INSERT INTO bug_53756 VALUES(6, 66);
+
+--echo
+--echo # connection con1 commits.
+--connection con1
+COMMIT;
+
+--echo
+--echo # connection con3 commits.
+--connection con3
+COMMIT;
+
+--echo
+--echo # connection con4 rolls back.
+--connection con4
+ROLLBACK;
+
+--echo
+--echo # connection con6 rolls back.
+--connection con6
+ROLLBACK;
+
+--echo
+--echo # The connections 2 and 5 stay open.
+
+--echo
+--echo # connection default selects resulting data.
+--echo # Delete of row 1 was committed.
+--echo # Update of row 3 was committed.
+--echo # Due to isolation level read committed, these should be included.
+--echo # All other changes should not be included.
+--connection default
+SELECT * FROM bug_53756;
+
+--echo
+--echo # connection default
+--connection default
+--echo #
+--echo # Crash server.
+#
+# Write file to make mysql-test-run.pl expect the "crash", but don't start
+# it until it's told to
+--exec echo "wait" > $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+#
+START TRANSACTION;
+INSERT INTO bug_53756 VALUES (666,666);
+#
+# Request a crash on next execution of commit.
+SET SESSION debug="+d,crash_commit_before";
+#
+# Execute the statement that causes the crash.
+--error 2013
+COMMIT;
+--echo
+--echo #
+--echo # disconnect con1, con2, con3, con4, con5, con6.
+--disconnect con1
+--disconnect con2
+--disconnect con3
+--disconnect con4
+--disconnect con5
+--disconnect con6
+--echo #
+--echo # Restart server.
+#
+# Write file to make mysql-test-run.pl start up the server again
+--exec echo "restart" > $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+#
+# Turn on reconnect
+--enable_reconnect
+#
+# Call script that will poll the server waiting for it to be back online again
+--source include/wait_until_connected_again.inc
+#
+# Turn off reconnect again
+--disable_reconnect
+--echo
+
+--echo #
+--echo # Select recovered data.
+--echo # Delete of row 1 was committed.
+--echo # Update of row 3 was committed.
+--echo # These should be included.
+--echo # All other changes should not be included.
+--echo # Delete of row 2 and insert of row 5 should be rolled back
+SELECT * FROM bug_53756;
+
+--echo
+--echo # Clean up.
+DROP TABLE bug_53756;
+
+--disable_query_log
+eval SET GLOBAL tx_isolation= '$global_isolation';
+eval SET SESSION tx_isolation= '$session_isolation';
+--enable_query_log
+
diff --git a/storage/innobase/btr/btr0btr.c b/storage/innobase/btr/btr0btr.c
index 5e8831b5d5e..b1b59227883 100644
--- a/storage/innobase/btr/btr0btr.c
+++ b/storage/innobase/btr/btr0btr.c
@@ -2060,7 +2060,6 @@ btr_compress(
 	ulint		n_recs;
 	ulint		max_ins_size;
 	ulint		max_ins_size_reorg;
-	ulint		level;
 	ulint		comp;
 
 	page = btr_cur_get_page(cursor);
@@ -2072,7 +2071,6 @@ btr_compress(
 				MTR_MEMO_X_LOCK));
 	ut_ad(mtr_memo_contains(mtr, buf_block_align(page),
 				MTR_MEMO_PAGE_X_FIX));
-	level = btr_page_get_level(page, mtr);
 	space = dict_index_get_space(index);
 
 	left_page_no = btr_page_get_prev(page, mtr);
diff --git a/storage/innobase/btr/btr0cur.c b/storage/innobase/btr/btr0cur.c
index d2a2e4d2157..a7160d74a32 100644
--- a/storage/innobase/btr/btr0cur.c
+++ b/storage/innobase/btr/btr0cur.c
@@ -3365,7 +3365,9 @@ btr_store_big_rec_extern_fields(
 	page_t*	page;
 	ulint	space_id;
 	page_t*	prev_page;
+#ifdef UNIV_SYNC_DEBUG
 	page_t*	rec_page;
+#endif /* UNIV_SYNC_DEBUG */
 	ulint	prev_page_no;
 	ulint	hint_page_no;
 	ulint	i;
@@ -3460,9 +3462,12 @@ btr_store_big_rec_extern_fields(
 
 			extern_len -= store_len;
 
-			rec_page = buf_page_get(space_id,
-						buf_frame_get_page_no(data),
-						RW_X_LATCH, &mtr);
+#ifdef UNIV_SYNC_DEBUG
+			rec_page =
+#endif /* UNIV_SYNC_DEBUG */
+			buf_page_get(space_id,
+				     buf_frame_get_page_no(data),
+				     RW_X_LATCH, &mtr);
 #ifdef UNIV_SYNC_DEBUG
 			buf_page_dbg_add_level(rec_page, SYNC_NO_ORDER_CHECK);
 #endif /* UNIV_SYNC_DEBUG */
@@ -3536,10 +3541,11 @@ btr_free_externally_stored_field(
 					X-latch to the index tree */
 {
 	page_t*	page;
+#ifdef UNIV_SYNC_DEBUG
 	page_t*	rec_page;
+#endif /* UNIV_SYNC_DEBUG */
 	ulint	space_id;
 	ulint	page_no;
-	ulint	offset;
 	ulint	extern_len;
 	ulint	next_page_no;
 	ulint	part_len;
@@ -3556,9 +3562,12 @@ btr_free_externally_stored_field(
 	for (;;) {
 		mtr_start(&mtr);
 
-		rec_page = buf_page_get(buf_frame_get_space_id(data),
-					buf_frame_get_page_no(data),
-					RW_X_LATCH, &mtr);
+#ifdef UNIV_SYNC_DEBUG
+		rec_page =
+#endif /* UNIV_SYNC_DEBUG */
+		buf_page_get(buf_frame_get_space_id(data),
+			     buf_frame_get_page_no(data),
+			     RW_X_LATCH, &mtr);
 #ifdef UNIV_SYNC_DEBUG
 		buf_page_dbg_add_level(rec_page, SYNC_NO_ORDER_CHECK);
 #endif /* UNIV_SYNC_DEBUG */
@@ -3568,8 +3577,6 @@ btr_free_externally_stored_field(
 		page_no = mach_read_from_4(data + local_len
 					   + BTR_EXTERN_PAGE_NO);
 
-		offset = mach_read_from_4(data + local_len
-					  + BTR_EXTERN_OFFSET);
 		extern_len = mach_read_from_4(data + local_len
 					      + BTR_EXTERN_LEN + 4);
 
diff --git a/storage/innobase/btr/btr0pcur.c b/storage/innobase/btr/btr0pcur.c
index 65b3c90c809..f73e82fb597 100644
--- a/storage/innobase/btr/btr0pcur.c
+++ b/storage/innobase/btr/btr0pcur.c
@@ -429,7 +429,6 @@ btr_pcur_move_backward_from_page(
 	mtr_t*		mtr)	/* in: mtr */
 {
 	ulint	prev_page_no;
-	ulint	space;
 	page_t*	page;
 	page_t*	prev_page;
 	ulint	latch_mode;
@@ -465,7 +464,6 @@ btr_pcur_move_backward_from_page(
 	page = btr_pcur_get_page(cursor);
 
 	prev_page_no = btr_page_get_prev(page, mtr);
-	space = buf_frame_get_space_id(page);
 
 	if (btr_pcur_is_before_first_on_page(cursor, mtr)
 	    && (prev_page_no != FIL_NULL)) {
diff --git a/storage/innobase/btr/btr0sea.c b/storage/innobase/btr/btr0sea.c
index 84ad0e27110..97c9f89db72 100644
--- a/storage/innobase/btr/btr0sea.c
+++ b/storage/innobase/btr/btr0sea.c
@@ -1401,7 +1401,6 @@ btr_search_update_hash_on_delete(
 	rec_t*		rec;
 	ulint		fold;
 	dulint		index_id;
-	ibool		found;
 	ulint		offsets_[REC_OFFS_NORMAL_SIZE];
 	mem_heap_t*	heap		= NULL;
 	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
@@ -1433,7 +1432,7 @@ btr_search_update_hash_on_delete(
 	}
 	rw_lock_x_lock(&btr_search_latch);
 
-	found = ha_search_and_delete_if_found(table, fold, rec);
+	ha_search_and_delete_if_found(table, fold, rec);
 
 	rw_lock_x_unlock(&btr_search_latch);
 }
diff --git a/storage/innobase/buf/buf0flu.c b/storage/innobase/buf/buf0flu.c
index 7533205d695..24fa306c127 100644
--- a/storage/innobase/buf/buf0flu.c
+++ b/storage/innobase/buf/buf0flu.c
@@ -841,7 +841,6 @@ buf_flush_batch(
 {
 	buf_block_t*	block;
 	ulint		page_count	= 0;
-	ulint		old_page_count;
 	ulint		space;
 	ulint		offset;
 	ibool		found;
@@ -913,15 +912,9 @@ buf_flush_batch(
 				mutex_exit(&block->mutex);
 				mutex_exit(&(buf_pool->mutex));
 
-				old_page_count = page_count;
-
 				/* Try to flush also all the neighbors */
 				page_count += buf_flush_try_neighbors(
 					space, offset, flush_type);
-				/* fprintf(stderr,
-				"Flush type %lu, page no %lu, neighb %lu\n",
-				flush_type, offset,
-				page_count - old_page_count); */
 
 				mutex_enter(&(buf_pool->mutex));
 
diff --git a/storage/innobase/eval/eval0eval.c b/storage/innobase/eval/eval0eval.c
index cbc47ec508f..52e9923fc05 100644
--- a/storage/innobase/eval/eval0eval.c
+++ b/storage/innobase/eval/eval0eval.c
@@ -367,18 +367,13 @@ eval_notfound(
 /*==========*/
 	func_node_t*	func_node)	/* in: function node */
 {
-	que_node_t*	arg1;
-	que_node_t*	arg2;
 	sym_node_t*	cursor;
 	sel_node_t*	sel_node;
 	ibool		ibool_val;
 
-	arg1 = func_node->args;
-	arg2 = que_node_get_next(arg1);
-
 	ut_ad(func_node->func == PARS_NOTFOUND_TOKEN);
 
-	cursor = arg1;
+	cursor = func_node->args;
 
 	ut_ad(que_node_get_type(cursor) == QUE_NODE_SYMBOL);
 
diff --git a/storage/innobase/handler/ha_innodb.cc b/storage/innobase/handler/ha_innodb.cc
index 4688b5fd16c..cfd4b229ce0 100644
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -5966,7 +5966,6 @@ innobase_drop_database(
 	trx_t*	parent_trx;
 	trx_t*	trx;
 	char*	ptr;
-	int	error;
 	char*	namebuf;
 	THD*	thd		= current_thd;
 
@@ -6004,7 +6003,7 @@ innobase_drop_database(
 		trx->check_foreigns = FALSE;
 	}
 
-	error = row_drop_database_for_mysql(namebuf, trx);
+	row_drop_database_for_mysql(namebuf, trx);
 	my_free(namebuf, MYF(0));
 
 	/* Flush the log to reduce probability that the .frm files and
@@ -6020,13 +6019,7 @@ innobase_drop_database(
 
 	innobase_commit_low(trx);
 	trx_free_for_mysql(trx);
-#ifdef NO_LONGER_INTERESTED_IN_DROP_DB_ERROR
-	error = convert_error_code_to_mysql(error, NULL);
-
-	return(error);
-#else
 	return;
-#endif
 }
 
 /*************************************************************************
@@ -7543,12 +7536,9 @@ innodb_show_status(
 
 	mutex_exit_noninline(&srv_monitor_file_mutex);
 
-	bool result = FALSE;
+	stat_print(thd, innobase_hton_name, (uint) strlen(innobase_hton_name),
+		   STRING_WITH_LEN(""), str, flen);
 
-	if (stat_print(thd, innobase_hton_name, (uint) strlen(innobase_hton_name),
-			STRING_WITH_LEN(""), str, flen)) {
-		result= TRUE;
-	}
 	my_free(str, MYF(0));
 
 	DBUG_RETURN(FALSE);
diff --git a/storage/innobase/include/ut0rnd.ic b/storage/innobase/include/ut0rnd.ic
index 625c378489a..dc4c0d62f56 100644
--- a/storage/innobase/include/ut0rnd.ic
+++ b/storage/innobase/include/ut0rnd.ic
@@ -67,9 +67,6 @@ ut_rnd_gen_ulint(void)
 			/* out: the 'random' number */
 {
 	ulint	rnd;
-	ulint	n_bits;
-
-	n_bits = 8 * sizeof(ulint);
 
 	ut_rnd_ulint_counter = UT_RND1 * ut_rnd_ulint_counter + UT_RND2;
 
diff --git a/storage/innobase/lock/lock0lock.c b/storage/innobase/lock/lock0lock.c
index 04240960b3a..57df99fb401 100644
--- a/storage/innobase/lock/lock0lock.c
+++ b/storage/innobase/lock/lock0lock.c
@@ -4296,7 +4296,6 @@ lock_print_info_all_transactions(
 	lock_t*	lock;
 	ulint	space;
 	ulint	page_no;
-	page_t*	page;
 	ibool	load_page_first = TRUE;
 	ulint	nth_trx		= 0;
 	ulint	nth_lock	= 0;
@@ -4410,8 +4409,7 @@ loop:
 
 			mtr_start(&mtr);
 
-			page = buf_page_get_with_no_latch(
-				space, page_no, &mtr);
+			buf_page_get_with_no_latch(space, page_no, &mtr);
 
 			mtr_commit(&mtr);
 
diff --git a/storage/innobase/log/log0recv.c b/storage/innobase/log/log0recv.c
index e6524eeefbf..6e1ca58cb15 100644
--- a/storage/innobase/log/log0recv.c
+++ b/storage/innobase/log/log0recv.c
@@ -400,10 +400,8 @@ recv_synchronize_groups(
 	dulint		start_lsn;
 	dulint		end_lsn;
 	dulint		recovered_lsn;
-	dulint		limit_lsn;
 
 	recovered_lsn = recv_sys->recovered_lsn;
-	limit_lsn = recv_sys->limit_lsn;
 
 	/* Read the last recovered log block to the recovery system buffer:
 	the block is always incomplete */
@@ -2506,7 +2504,9 @@ recv_recovery_from_checkpoint_start(
 	dulint		old_scanned_lsn;
 	dulint		group_scanned_lsn;
 	dulint		contiguous_lsn;
+#ifdef UNIV_LOG_ARCHIVE
 	dulint		archived_lsn;
+#endif /* UNIV_LOG_ARCHIVE */
 	ulint		capacity;
 	byte*		buf;
 	byte		log_hdr_buf[LOG_FILE_HDR_SIZE];
@@ -2552,7 +2552,9 @@ recv_recovery_from_checkpoint_start(
 
 	checkpoint_lsn = mach_read_from_8(buf + LOG_CHECKPOINT_LSN);
 	checkpoint_no = mach_read_from_8(buf + LOG_CHECKPOINT_NO);
+#ifdef UNIV_LOG_ARCHIVE
 	archived_lsn = mach_read_from_8(buf + LOG_CHECKPOINT_ARCHIVED_LSN);
+#endif /* UNIV_LOG_ARCHIVE */
 
 	/* Read the first log file header to print a note if this is
 	a recovery from a restored InnoDB Hot Backup */
diff --git a/storage/innobase/os/os0file.c b/storage/innobase/os/os0file.c
index 3396d1adf2f..a995aee5fab 100644
--- a/storage/innobase/os/os0file.c
+++ b/storage/innobase/os/os0file.c
@@ -1314,8 +1314,6 @@ try_again:
 	int		create_flag;
 	ibool		retry;
 	const char*	mode_str	= NULL;
-	const char*	type_str	= NULL;
-	const char*	purpose_str	= NULL;
 
 try_again:
 	ut_a(name);
@@ -1335,26 +1333,9 @@ try_again:
 		ut_error;
 	}
 
-	if (type == OS_LOG_FILE) {
-		type_str = "LOG";
-	} else if (type == OS_DATA_FILE) {
-		type_str = "DATA";
-	} else {
-		ut_error;
-	}
+	ut_a(type == OS_LOG_FILE || type == OS_DATA_FILE);
+	ut_a(purpose == OS_FILE_AIO || purpose == OS_FILE_NORMAL);
 
-	if (purpose == OS_FILE_AIO) {
-		purpose_str = "AIO";
-	} else if (purpose == OS_FILE_NORMAL) {
-		purpose_str = "NORMAL";
-	} else {
-		ut_error;
-	}
-
-#if 0
-	fprintf(stderr, "Opening file %s, mode %s, type %s, purpose %s\n",
-		name, mode_str, type_str, purpose_str);
-#endif
 #ifdef O_SYNC
 	/* We let O_SYNC only affect log files; note that we map O_DSYNC to
 	O_SYNC because the datasync options seemed to corrupt files in 2001
diff --git a/storage/innobase/que/que0que.c b/storage/innobase/que/que0que.c
index bf83f28f04e..1a76823ca4d 100644
--- a/storage/innobase/que/que0que.c
+++ b/storage/innobase/que/que0que.c
@@ -802,13 +802,11 @@ que_thr_dec_refer_count(
 {
 	que_fork_t*	fork;
 	trx_t*		trx;
-	sess_t*		sess;
 	ulint		fork_type;
 	ibool		stopped;
 
 	fork = thr->common.parent;
 	trx = thr_get_trx(thr);
-	sess = trx->sess;
 
 	mutex_enter(&kernel_mutex);
 
@@ -1292,18 +1290,13 @@ que_run_threads_low(
 	que_thr_t*	thr)	/* in: query thread */
 {
 	que_thr_t*	next_thr;
-	ulint		cumul_resource;
 	ulint		loop_count;
 
 	ut_ad(thr->state == QUE_THR_RUNNING);
 	ut_a(thr_get_trx(thr)->error_state == DB_SUCCESS);
 	ut_ad(!mutex_own(&kernel_mutex));
 
-	/* cumul_resource counts how much resources the OS thread (NOT the
-	query thread) has spent in this function */
-
 	loop_count = QUE_MAX_LOOPS_WITHOUT_CHECK;
-	cumul_resource = 0;
 loop:
 	/* Check that there is enough space in the log to accommodate
 	possible log entries by this query step; if the operation can touch
diff --git a/storage/innobase/row/row0mysql.c b/storage/innobase/row/row0mysql.c
index 4a834c4efc2..2058363c786 100644
--- a/storage/innobase/row/row0mysql.c
+++ b/storage/innobase/row/row0mysql.c
@@ -1447,7 +1447,12 @@ run_again:
 		srv_n_rows_updated++;
 	}
 
-	row_update_statistics_if_needed(prebuilt->table);
+	/* We update table statistics only if it is a DELETE or UPDATE
+	that changes indexed columns, UPDATEs that change only non-indexed
+	columns would not affect statistics. */
+	if (node->is_delete || !(node->cmpl_info & UPD_NODE_NO_ORD_CHANGE)) {
+		row_update_statistics_if_needed(prebuilt->table);
+	}
 
 	trx->op_info = "";
 
diff --git a/storage/innobase/row/row0purge.c b/storage/innobase/row/row0purge.c
index 1fef47da13f..deec3b0a454 100644
--- a/storage/innobase/row/row0purge.c
+++ b/storage/innobase/row/row0purge.c
@@ -667,7 +667,7 @@ row_purge_step(
 
 	err = row_purge(node, thr);
 
-	ut_ad(err == DB_SUCCESS);
+	ut_a(err == DB_SUCCESS);
 
 	return(thr);
 }
diff --git a/storage/innobase/row/row0umod.c b/storage/innobase/row/row0umod.c
index 68139da116e..a3333fcc536 100644
--- a/storage/innobase/row/row0umod.c
+++ b/storage/innobase/row/row0umod.c
@@ -89,12 +89,17 @@ row_undo_mod_clust_low(
 	btr_pcur_t*	pcur;
 	btr_cur_t*	btr_cur;
 	ulint		err;
+#ifdef UNIV_DEBUG
 	ibool		success;
+#endif /* UNIV_DEBUG */
 
 	pcur = &(node->pcur);
 	btr_cur = btr_pcur_get_btr_cur(pcur);
 
-	success = btr_pcur_restore_position(mode, pcur, mtr);
+#ifdef UNIV_DEBUG
+	success =
+#endif /* UNIV_DEBUG */
+	btr_pcur_restore_position(mode, pcur, mtr);
 
 	ut_ad(success);
 
diff --git a/storage/innobase/row/row0upd.c b/storage/innobase/row/row0upd.c
index c91cc449b96..034b7010410 100644
--- a/storage/innobase/row/row0upd.c
+++ b/storage/innobase/row/row0upd.c
@@ -2037,7 +2037,9 @@ row_upd_in_place_in_select(
 	upd_node_t*	node;
 	btr_pcur_t*	pcur;
 	btr_cur_t*	btr_cur;
+#ifdef UNIV_DEBUG
 	ulint		err;
+#endif /* UNIV_DEBUG */
 	mem_heap_t*	heap		= NULL;
 	ulint		offsets_[REC_OFFS_NORMAL_SIZE];
 	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
@@ -2074,8 +2076,11 @@ row_upd_in_place_in_select(
 	ut_ad(node->cmpl_info & UPD_NODE_NO_ORD_CHANGE);
 	ut_ad(node->select_will_do_update);
 
-	err = btr_cur_update_in_place(BTR_NO_LOCKING_FLAG, btr_cur,
-				      node->update, node->cmpl_info,
-				      thr, mtr);
+#ifdef UNIV_DEBUG
+	err =
+#endif /* UNIV_DEBUG */
+	btr_cur_update_in_place(BTR_NO_LOCKING_FLAG, btr_cur,
+				node->update, node->cmpl_info,
+				thr, mtr);
 	ut_ad(err == DB_SUCCESS);
 }
diff --git a/storage/innobase/row/row0vers.c b/storage/innobase/row/row0vers.c
index 03d9a2f1203..f4adfa855df 100644
--- a/storage/innobase/row/row0vers.c
+++ b/storage/innobase/row/row0vers.c
@@ -59,7 +59,9 @@ row_vers_impl_x_locked_off_kernel(
 	trx_t*		trx;
 	ulint		vers_del;
 	ulint		rec_del;
+#ifdef UNIV_DEBUG
 	ulint		err;
+#endif /* UNIV_DEBUG */
 	mtr_t		mtr;
 	ulint		comp;
 
@@ -152,9 +154,12 @@ row_vers_impl_x_locked_off_kernel(
 
 		heap2 = heap;
 		heap = mem_heap_create(1024);
-		err = trx_undo_prev_version_build(clust_rec, &mtr, version,
-						  clust_index, clust_offsets,
-						  heap, &prev_version);
+#ifdef UNIV_DEBUG
+		err =
+#endif /* UNIV_DEBUG */
+		trx_undo_prev_version_build(clust_rec, &mtr, version,
+					    clust_index, clust_offsets,
+					    heap, &prev_version);
 		mem_heap_free(heap2); /* free version and clust_offsets */
 
 		if (prev_version) {
diff --git a/storage/innobase/trx/trx0purge.c b/storage/innobase/trx/trx0purge.c
index f0f300d918e..9e09efc82b2 100644
--- a/storage/innobase/trx/trx0purge.c
+++ b/storage/innobase/trx/trx0purge.c
@@ -249,9 +249,10 @@ trx_purge_add_update_undo_to_history(
 	trx_undo_t*	undo;
 	trx_rseg_t*	rseg;
 	trx_rsegf_t*	rseg_header;
+#ifdef UNIV_DEBUG
 	trx_usegf_t*	seg_header;
+#endif /* UNIV_DEBUG */
 	trx_ulogf_t*	undo_header;
-	trx_upagef_t*	page_header;
 	ulint		hist_size;
 
 	undo = trx->update_undo;
@@ -265,8 +266,9 @@ trx_purge_add_update_undo_to_history(
 	rseg_header = trx_rsegf_get(rseg->space, rseg->page_no, mtr);
 
 	undo_header = undo_page + undo->hdr_offset;
+#ifdef UNIV_DEBUG
 	seg_header  = undo_page + TRX_UNDO_SEG_HDR;
-	page_header = undo_page + TRX_UNDO_PAGE_HDR;
+#endif /* UNIV_DEBUG */
 
 	if (undo->state != TRX_UNDO_CACHED) {
 		/* The undo log segment will not be reused */
@@ -594,7 +596,6 @@ trx_purge_rseg_get_next_history_log(
 {
 	page_t*		undo_page;
 	trx_ulogf_t*	log_hdr;
-	trx_usegf_t*	seg_hdr;
 	fil_addr_t	prev_log_addr;
 	dulint		trx_no;
 	ibool		del_marks;
@@ -615,7 +616,6 @@ trx_purge_rseg_get_next_history_log(
 	undo_page = trx_undo_page_get_s_latched(rseg->space,
 						rseg->last_page_no, &mtr);
 	log_hdr = undo_page + rseg->last_offset;
-	seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
 
 	/* Increase the purge page count by one for every handled log */
 
@@ -1004,12 +1004,8 @@ trx_purge_rec_release(
 /*==================*/
 	trx_undo_inf_t*	cell)	/* in: storage cell */
 {
-	trx_undo_arr_t*	arr;
-
 	mutex_enter(&(purge_sys->mutex));
 
-	arr = purge_sys->arr;
-
 	trx_purge_arr_remove_info(cell);
 
 	mutex_exit(&(purge_sys->mutex));
diff --git a/storage/innobase/trx/trx0roll.c b/storage/innobase/trx/trx0roll.c
index 8934fe87c7e..285e30796a5 100644
--- a/storage/innobase/trx/trx0roll.c
+++ b/storage/innobase/trx/trx0roll.c
@@ -713,13 +713,8 @@ trx_undo_arr_remove_info(
 	dulint		undo_no)/* in: undo number */
 {
 	trx_undo_inf_t*	cell;
-	ulint		n_used;
-	ulint		n;
 	ulint		i;
 
-	n_used = arr->n_used;
-	n = 0;
-
 	for (i = 0;; i++) {
 		cell = trx_undo_arr_get_nth_info(arr, i);
 
diff --git a/storage/innobase/trx/trx0sys.c b/storage/innobase/trx/trx0sys.c
index f732aca93f5..137771b71ed 100644
--- a/storage/innobase/trx/trx0sys.c
+++ b/storage/innobase/trx/trx0sys.c
@@ -165,7 +165,9 @@ trx_sys_create_doublewrite_buf(void)
 {
 	page_t*	page;
 	page_t*	page2;
+#ifdef UNIV_SYNC_DEBUG
 	page_t*	new_page;
+#endif /* UNIV_SYNC_DEBUG */
 	byte*	doublewrite;
 	byte*	fseg_header;
 	ulint	page_no;
@@ -271,8 +273,11 @@ start_again:
 			the page position in the tablespace, then the page
 			has not been written to in doublewrite. */
 
-			new_page = buf_page_get(TRX_SYS_SPACE, page_no,
-						RW_X_LATCH, &mtr);
+#ifdef UNIV_SYNC_DEBUG
+			new_page =
+#endif /* UNIV_SYNC_DEBUG */
+			buf_page_get(TRX_SYS_SPACE, page_no,
+				     RW_X_LATCH, &mtr);
 #ifdef UNIV_SYNC_DEBUG
 			buf_page_dbg_add_level(new_page, SYNC_NO_ORDER_CHECK);
 #endif /* UNIV_SYNC_DEBUG */
diff --git a/storage/innobase/trx/trx0trx.c b/storage/innobase/trx/trx0trx.c
index 545226a5994..21f75e0818f 100644
--- a/storage/innobase/trx/trx0trx.c
+++ b/storage/innobase/trx/trx0trx.c
@@ -1827,7 +1827,6 @@ trx_prepare_off_kernel(
 /*===================*/
 	trx_t*	trx)	/* in: transaction */
 {
-	page_t*		update_hdr_page;
 	trx_rseg_t*	rseg;
 	ibool		must_flush_log	= FALSE;
 	dulint		lsn;
@@ -1863,7 +1862,7 @@ trx_prepare_off_kernel(
 		}
 
 		if (trx->update_undo) {
-			update_hdr_page = trx_undo_set_state_at_prepare(
+			trx_undo_set_state_at_prepare(
 				trx, trx->update_undo, &mtr);
 		}
 
diff --git a/storage/innobase/trx/trx0undo.c b/storage/innobase/trx/trx0undo.c
index deb6c85e6e3..4547ee9ea64 100644
--- a/storage/innobase/trx/trx0undo.c
+++ b/storage/innobase/trx/trx0undo.c
@@ -1012,14 +1012,11 @@ trx_undo_truncate_end(
 	ulint		last_page_no;
 	trx_undo_rec_t* rec;
 	trx_undo_rec_t* trunc_here;
-	trx_rseg_t*	rseg;
 	mtr_t		mtr;
 
 	ut_ad(mutex_own(&(trx->undo_mutex)));
 	ut_ad(mutex_own(&(trx->rseg->mutex)));
 
-	rseg = trx->rseg;
-
 	for (;;) {
 		mtr_start(&mtr);
 
@@ -1798,7 +1795,6 @@ trx_undo_set_state_at_prepare(
 	mtr_t*		mtr)	/* in: mtr */
 {
 	trx_usegf_t*	seg_hdr;
-	trx_upagef_t*	page_hdr;
 	trx_ulogf_t*	undo_header;
 	page_t*		undo_page;
 	ulint		offset;
@@ -1815,7 +1811,6 @@ trx_undo_set_state_at_prepare(
 	undo_page = trx_undo_page_get(undo->space, undo->hdr_page_no, mtr);
 
 	seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
-	page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
 
 	/*------------------------------*/
 	undo->state = TRX_UNDO_PREPARED;
diff --git a/storage/innodb_plugin/ChangeLog b/storage/innodb_plugin/ChangeLog
index 538cd40dd5b..19ff64562fc 100644
--- a/storage/innodb_plugin/ChangeLog
+++ b/storage/innodb_plugin/ChangeLog
@@ -1,3 +1,7 @@
+2010-09-06	The InnoDB Team
+	* dict/dict0load.c, innodb_bug53756.test innodb_bug53756.result
+	Fix Bug #53756 	ALTER TABLE ADD PRIMARY KEY affects crash recovery
+
 2010-08-24	The InnoDB Team
 
 	* handler/ha_innodb.c, dict/dict0dict.c:
diff --git a/storage/innodb_plugin/btr/btr0btr.c b/storage/innodb_plugin/btr/btr0btr.c
index 02677e0a71c..29cd470e650 100644
--- a/storage/innodb_plugin/btr/btr0btr.c
+++ b/storage/innodb_plugin/btr/btr0btr.c
@@ -1895,7 +1895,6 @@ btr_page_split_and_insert(
 	buf_block_t*	left_block;
 	buf_block_t*	right_block;
 	buf_block_t*	insert_block;
-	page_t*		insert_page;
 	page_cur_t*	page_cursor;
 	rec_t*		first_rec;
 	byte*		buf = 0; /* remove warning */
@@ -2153,8 +2152,6 @@ insert_empty:
 		insert_block = right_block;
 	}
 
-	insert_page = buf_block_get_frame(insert_block);
-
 	/* 7. Reposition the cursor for insert and try insertion */
 	page_cursor = btr_cur_get_page_cur(cursor);
 
@@ -2166,8 +2163,12 @@ insert_empty:
 
 #ifdef UNIV_ZIP_DEBUG
 	{
+		page_t*		insert_page
+			= buf_block_get_frame(insert_block);
+
 		page_zip_des_t*	insert_page_zip
 			= buf_block_get_page_zip(insert_block);
+
 		ut_a(!insert_page_zip
 		     || page_zip_validate(insert_page_zip, insert_page));
 	}
@@ -2560,7 +2561,6 @@ btr_compress(
 	ulint		n_recs;
 	ulint		max_ins_size;
 	ulint		max_ins_size_reorg;
-	ulint		level;
 
 	block = btr_cur_get_block(cursor);
 	page = btr_cur_get_page(cursor);
@@ -2570,7 +2570,6 @@ btr_compress(
 	ut_ad(mtr_memo_contains(mtr, dict_index_get_lock(index),
 				MTR_MEMO_X_LOCK));
 	ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX));
-	level = btr_page_get_level(page, mtr);
 	space = dict_index_get_space(index);
 	zip_size = dict_table_zip_size(index->table);
 
diff --git a/storage/innodb_plugin/btr/btr0cur.c b/storage/innodb_plugin/btr/btr0cur.c
index 7fa7d42320a..884b7fed8dd 100644
--- a/storage/innodb_plugin/btr/btr0cur.c
+++ b/storage/innodb_plugin/btr/btr0cur.c
@@ -1836,7 +1836,6 @@ btr_cur_optimistic_update(
 	page_t*		page;
 	page_zip_des_t*	page_zip;
 	rec_t*		rec;
-	rec_t*		orig_rec;
 	ulint		max_size;
 	ulint		new_rec_size;
 	ulint		old_rec_size;
@@ -1850,7 +1849,7 @@ btr_cur_optimistic_update(
 
 	block = btr_cur_get_block(cursor);
 	page = buf_block_get_frame(block);
-	orig_rec = rec = btr_cur_get_rec(cursor);
+	rec = btr_cur_get_rec(cursor);
 	index = cursor->index;
 	ut_ad(!!page_rec_is_comp(rec) == dict_table_is_comp(index->table));
 	ut_ad(mtr_memo_contains(mtr, block, MTR_MEMO_PAGE_X_FIX));
@@ -4279,12 +4278,17 @@ btr_free_externally_stored_field(
 	}
 
 	for (;;) {
+#ifdef UNIV_SYNC_DEBUG
 		buf_block_t*	rec_block;
+#endif /* UNIV_SYNC_DEBUG */
 		buf_block_t*	ext_block;
 
 		mtr_start(&mtr);
 
-		rec_block = buf_page_get(page_get_space_id(
+#ifdef UNIV_SYNC_DEBUG
+		rec_block =
+#endif /* UNIV_SYNC_DEBUG */
+			buf_page_get(page_get_space_id(
 						 page_align(field_ref)),
 					 rec_zip_size,
 					 page_get_page_no(
diff --git a/storage/innodb_plugin/btr/btr0pcur.c b/storage/innodb_plugin/btr/btr0pcur.c
index 658901208ef..056896c7927 100644
--- a/storage/innodb_plugin/btr/btr0pcur.c
+++ b/storage/innodb_plugin/btr/btr0pcur.c
@@ -452,7 +452,6 @@ btr_pcur_move_backward_from_page(
 	mtr_t*		mtr)	/*!< in: mtr */
 {
 	ulint		prev_page_no;
-	ulint		space;
 	page_t*		page;
 	buf_block_t*	prev_block;
 	ulint		latch_mode;
@@ -488,7 +487,6 @@ btr_pcur_move_backward_from_page(
 	page = btr_pcur_get_page(cursor);
 
 	prev_page_no = btr_page_get_prev(page, mtr);
-	space = buf_block_get_space(btr_pcur_get_block(cursor));
 
 	if (prev_page_no == FIL_NULL) {
 	} else if (btr_pcur_is_before_first_on_page(cursor)) {
diff --git a/storage/innodb_plugin/btr/btr0sea.c b/storage/innodb_plugin/btr/btr0sea.c
index f3ffe07a951..035fdbb61d2 100644
--- a/storage/innodb_plugin/btr/btr0sea.c
+++ b/storage/innodb_plugin/btr/btr0sea.c
@@ -1495,7 +1495,6 @@ btr_search_update_hash_on_delete(
 	rec_t*		rec;
 	ulint		fold;
 	dulint		index_id;
-	ibool		found;
 	ulint		offsets_[REC_OFFS_NORMAL_SIZE];
 	mem_heap_t*	heap		= NULL;
 	rec_offs_init(offsets_);
@@ -1528,7 +1527,7 @@ btr_search_update_hash_on_delete(
 	}
 	rw_lock_x_lock(&btr_search_latch);
 
-	found = ha_search_and_delete_if_found(table, fold, rec);
+	ha_search_and_delete_if_found(table, fold, rec);
 
 	rw_lock_x_unlock(&btr_search_latch);
 }
diff --git a/storage/innodb_plugin/buf/buf0flu.c b/storage/innodb_plugin/buf/buf0flu.c
index d8c0497fa1e..747ce65879d 100644
--- a/storage/innodb_plugin/buf/buf0flu.c
+++ b/storage/innodb_plugin/buf/buf0flu.c
@@ -128,10 +128,15 @@ buf_flush_delete_from_flush_rbt(
 	buf_page_t*	bpage)		/*!< in: bpage to be removed. */
 {
 
+#ifdef UNIV_DEBUG
 	ibool	ret = FALSE;
+#endif /* UNIV_DEBUG */
 
 	ut_ad(buf_pool_mutex_own());
-	ret = rbt_delete(buf_pool->flush_rbt, &bpage);
+#ifdef UNIV_DEBUG
+	ret =
+#endif /* UNIV_DEBUG */
+	rbt_delete(buf_pool->flush_rbt, &bpage);
 	ut_ad(ret);
 }
 
@@ -1266,7 +1271,6 @@ buf_flush_batch(
 {
 	buf_page_t*	bpage;
 	ulint		page_count	= 0;
-	ulint		old_page_count;
 	ulint		space;
 	ulint		offset;
 
@@ -1338,15 +1342,9 @@ flush_next:
 
 				buf_pool_mutex_exit();
 
-				old_page_count = page_count;
-
 				/* Try to flush also all the neighbors */
 				page_count += buf_flush_try_neighbors(
 					space, offset, flush_type);
-				/* fprintf(stderr,
-				"Flush type %lu, page no %lu, neighb %lu\n",
-				flush_type, offset,
-				page_count - old_page_count); */
 
 				buf_pool_mutex_enter();
 				goto flush_next;
diff --git a/storage/innodb_plugin/dict/dict0crea.c b/storage/innodb_plugin/dict/dict0crea.c
index 09353c45c8c..e63f8bc3e6a 100644
--- a/storage/innodb_plugin/dict/dict0crea.c
+++ b/storage/innodb_plugin/dict/dict0crea.c
@@ -627,7 +627,6 @@ dict_create_index_tree_step(
 {
 	dict_index_t*	index;
 	dict_table_t*	sys_indexes;
-	dict_table_t*	table;
 	dtuple_t*	search_tuple;
 	ulint		zip_size;
 	btr_pcur_t	pcur;
@@ -636,7 +635,6 @@ dict_create_index_tree_step(
 	ut_ad(mutex_own(&(dict_sys->mutex)));
 
 	index = node->index;
-	table = node->table;
 
 	sys_indexes = dict_sys->sys_indexes;
 
diff --git a/storage/innodb_plugin/dict/dict0dict.c b/storage/innodb_plugin/dict/dict0dict.c
index 560534345f9..a3575c283cd 100644
--- a/storage/innodb_plugin/dict/dict0dict.c
+++ b/storage/innodb_plugin/dict/dict0dict.c
@@ -4441,7 +4441,6 @@ dict_index_print_low(
 {
 	ib_int64_t	n_vals;
 	ulint		i;
-	const char*	type_string;
 
 	ut_ad(mutex_own(&(dict_sys->mutex)));
 
@@ -4456,14 +4455,6 @@ dict_index_print_low(
 
 	dict_index_stat_mutex_exit(index);
 
-	if (dict_index_is_clust(index)) {
-		type_string = "clustered index";
-	} else if (dict_index_is_unique(index)) {
-		type_string = "unique index";
-	} else {
-		type_string = "secondary index";
-	}
-
 	fprintf(stderr,
 		"  INDEX: name %s, id %lu %lu, fields %lu/%lu,"
 		" uniq %lu, type %lu\n"
diff --git a/storage/innodb_plugin/dict/dict0load.c b/storage/innodb_plugin/dict/dict0load.c
index 3c495d21786..e20c9c57379 100644
--- a/storage/innodb_plugin/dict/dict0load.c
+++ b/storage/innodb_plugin/dict/dict0load.c
@@ -1072,6 +1072,8 @@ dict_load_table_on_id(
 
 	ut_ad(mutex_own(&(dict_sys->mutex)));
 
+	table = NULL;
+
 	/* NOTE that the operation of this function is protected by
 	the dictionary mutex, and therefore no deadlocks can occur
 	with other dictionary operations. */
@@ -1098,15 +1100,17 @@ dict_load_table_on_id(
 				  BTR_SEARCH_LEAF, &pcur, &mtr);
 	rec = btr_pcur_get_rec(&pcur);
 
-	if (!btr_pcur_is_on_user_rec(&pcur)
-	    || rec_get_deleted_flag(rec, 0)) {
+	if (!btr_pcur_is_on_user_rec(&pcur)) {
 		/* Not found */
+		goto func_exit;
+	}
 
-		btr_pcur_close(&pcur);
-		mtr_commit(&mtr);
-		mem_heap_free(heap);
-
-		return(NULL);
+	/* Find the first record that is not delete marked */
+	while (rec_get_deleted_flag(rec, 0)) {
+		if (!btr_pcur_move_to_next_user_rec(&pcur, &mtr)) {
+			goto func_exit;
+		}
+		rec = btr_pcur_get_rec(&pcur);
 	}
 
 	/*---------------------------------------------------*/
@@ -1119,19 +1123,14 @@ dict_load_table_on_id(
 
 	/* Check if the table id in record is the one searched for */
 	if (ut_dulint_cmp(table_id, mach_read_from_8(field)) != 0) {
-
-		btr_pcur_close(&pcur);
-		mtr_commit(&mtr);
-		mem_heap_free(heap);
-
-		return(NULL);
+		goto func_exit;
 	}
 
 	/* Now we get the table name from the record */
 	field = rec_get_nth_field_old(rec, 1, &len);
 	/* Load the table definition to memory */
 	table = dict_load_table(mem_heap_strdupl(heap, (char*) field, len));
-
+func_exit:
 	btr_pcur_close(&pcur);
 	mtr_commit(&mtr);
 	mem_heap_free(heap);
diff --git a/storage/innodb_plugin/eval/eval0eval.c b/storage/innodb_plugin/eval/eval0eval.c
index 589b0fa1576..dcd416adeee 100644
--- a/storage/innodb_plugin/eval/eval0eval.c
+++ b/storage/innodb_plugin/eval/eval0eval.c
@@ -384,18 +384,13 @@ eval_notfound(
 /*==========*/
 	func_node_t*	func_node)	/*!< in: function node */
 {
-	que_node_t*	arg1;
-	que_node_t*	arg2;
 	sym_node_t*	cursor;
 	sel_node_t*	sel_node;
 	ibool		ibool_val;
 
-	arg1 = func_node->args;
-	arg2 = que_node_get_next(arg1);
-
 	ut_ad(func_node->func == PARS_NOTFOUND_TOKEN);
 
-	cursor = arg1;
+	cursor = func_node->args;
 
 	ut_ad(que_node_get_type(cursor) == QUE_NODE_SYMBOL);
 
diff --git a/storage/innodb_plugin/handler/ha_innodb.cc b/storage/innodb_plugin/handler/ha_innodb.cc
index c7474109d4f..a7635a402a6 100644
--- a/storage/innodb_plugin/handler/ha_innodb.cc
+++ b/storage/innodb_plugin/handler/ha_innodb.cc
@@ -7007,7 +7007,6 @@ innobase_drop_database(
 	ulint	len		= 0;
 	trx_t*	trx;
 	char*	ptr;
-	int	error;
 	char*	namebuf;
 	THD*	thd		= current_thd;
 
@@ -7050,7 +7049,7 @@ innobase_drop_database(
 #else
 	trx = innobase_trx_allocate(thd);
 #endif
-	error = row_drop_database_for_mysql(namebuf, trx);
+	row_drop_database_for_mysql(namebuf, trx);
 	my_free(namebuf, MYF(0));
 
 	/* Flush the log to reduce probability that the .frm files and
@@ -8848,12 +8847,9 @@ innodb_show_status(
 
 	mutex_exit(&srv_monitor_file_mutex);
 
-	bool result = FALSE;
+	stat_print(thd, innobase_hton_name, (uint) strlen(innobase_hton_name),
+		   STRING_WITH_LEN(""), str, flen);
 
-	if (stat_print(thd, innobase_hton_name, (uint) strlen(innobase_hton_name),
-			STRING_WITH_LEN(""), str, flen)) {
-		result= TRUE;
-	}
 	my_free(str, MYF(0));
 
 	DBUG_RETURN(FALSE);
diff --git a/storage/innodb_plugin/handler/i_s.cc b/storage/innodb_plugin/handler/i_s.cc
index 524fe696de2..9ad2d656365 100644
--- a/storage/innodb_plugin/handler/i_s.cc
+++ b/storage/innodb_plugin/handler/i_s.cc
@@ -1012,6 +1012,7 @@ trx_i_s_common_fill_table(
 	deadlock occurs between the mysqld server and mysql client,
 	see http://bugs.mysql.com/29900 ; when that bug is resolved
 	we can enable the DBUG_RETURN(ret) above */
+	ret++;  // silence a gcc46 warning
 	DBUG_RETURN(0);
 #endif
 }
diff --git a/storage/innodb_plugin/include/os0sync.h b/storage/innodb_plugin/include/os0sync.h
index 0c22162b900..f32e7ab710a 100644
--- a/storage/innodb_plugin/include/os0sync.h
+++ b/storage/innodb_plugin/include/os0sync.h
@@ -330,7 +330,7 @@ amount of increment. */
 Returns the old value of *ptr, atomically sets *ptr to new_val */
 
 # define os_atomic_test_and_set_byte(ptr, new_val) \
-	__sync_lock_test_and_set(ptr, new_val)
+	__sync_lock_test_and_set(ptr, (byte) new_val)
 
 #elif defined(HAVE_IB_SOLARIS_ATOMICS)
 
diff --git a/storage/innodb_plugin/include/univ.i b/storage/innodb_plugin/include/univ.i
index 66b712a0355..ee77582d7f1 100644
--- a/storage/innodb_plugin/include/univ.i
+++ b/storage/innodb_plugin/include/univ.i
@@ -46,7 +46,7 @@ Created 1/20/1994 Heikki Tuuri
 
 #define INNODB_VERSION_MAJOR	1
 #define INNODB_VERSION_MINOR	0
-#define INNODB_VERSION_BUGFIX	12
+#define INNODB_VERSION_BUGFIX	13
 
 /* The following is the InnoDB version as shown in
 SELECT plugin_version FROM information_schema.plugins;
diff --git a/storage/innodb_plugin/include/ut0rnd.ic b/storage/innodb_plugin/include/ut0rnd.ic
index c3dbd86923c..a33813037ea 100644
--- a/storage/innodb_plugin/include/ut0rnd.ic
+++ b/storage/innodb_plugin/include/ut0rnd.ic
@@ -85,9 +85,6 @@ ut_rnd_gen_ulint(void)
 /*==================*/
 {
 	ulint	rnd;
-	ulint	n_bits;
-
-	n_bits = 8 * sizeof(ulint);
 
 	ut_rnd_ulint_counter = UT_RND1 * ut_rnd_ulint_counter + UT_RND2;
 
diff --git a/storage/innodb_plugin/log/log0recv.c b/storage/innodb_plugin/log/log0recv.c
index a727d6be768..c1d12dad413 100644
--- a/storage/innodb_plugin/log/log0recv.c
+++ b/storage/innodb_plugin/log/log0recv.c
@@ -559,10 +559,8 @@ recv_synchronize_groups(
 	ib_uint64_t	start_lsn;
 	ib_uint64_t	end_lsn;
 	ib_uint64_t	recovered_lsn;
-	ib_uint64_t	limit_lsn;
 
 	recovered_lsn = recv_sys->recovered_lsn;
-	limit_lsn = recv_sys->limit_lsn;
 
 	/* Read the last recovered log block to the recovery system buffer:
 	the block is always incomplete */
@@ -2891,7 +2889,9 @@ recv_recovery_from_checkpoint_start_func(
 	ib_uint64_t	old_scanned_lsn;
 	ib_uint64_t	group_scanned_lsn;
 	ib_uint64_t	contiguous_lsn;
+#ifdef UNIV_LOG_ARCHIVE
 	ib_uint64_t	archived_lsn;
+#endif /* UNIV_LOG_ARCHIVE */
 	byte*		buf;
 	byte		log_hdr_buf[LOG_FILE_HDR_SIZE];
 	ulint		err;
@@ -2946,7 +2946,9 @@ recv_recovery_from_checkpoint_start_func(
 
 	checkpoint_lsn = mach_read_ull(buf + LOG_CHECKPOINT_LSN);
 	checkpoint_no = mach_read_ull(buf + LOG_CHECKPOINT_NO);
+#ifdef UNIV_LOG_ARCHIVE
 	archived_lsn = mach_read_ull(buf + LOG_CHECKPOINT_ARCHIVED_LSN);
+#endif /* UNIV_LOG_ARCHIVE */
 
 	/* Read the first log file header to print a note if this is
 	a recovery from a restored InnoDB Hot Backup */
diff --git a/storage/innodb_plugin/os/os0file.c b/storage/innodb_plugin/os/os0file.c
index 9f937b9def2..6a0d6ea5363 100644
--- a/storage/innodb_plugin/os/os0file.c
+++ b/storage/innodb_plugin/os/os0file.c
@@ -1367,8 +1367,6 @@ try_again:
 	int		create_flag;
 	ibool		retry;
 	const char*	mode_str	= NULL;
-	const char*	type_str	= NULL;
-	const char*	purpose_str	= NULL;
 
 try_again:
 	ut_a(name);
@@ -1388,26 +1386,9 @@ try_again:
 		ut_error;
 	}
 
-	if (type == OS_LOG_FILE) {
-		type_str = "LOG";
-	} else if (type == OS_DATA_FILE) {
-		type_str = "DATA";
-	} else {
-		ut_error;
-	}
+	ut_a(type == OS_LOG_FILE || type == OS_DATA_FILE);
+	ut_a(purpose == OS_FILE_AIO || purpose == OS_FILE_NORMAL);
 
-	if (purpose == OS_FILE_AIO) {
-		purpose_str = "AIO";
-	} else if (purpose == OS_FILE_NORMAL) {
-		purpose_str = "NORMAL";
-	} else {
-		ut_error;
-	}
-
-#if 0
-	fprintf(stderr, "Opening file %s, mode %s, type %s, purpose %s\n",
-		name, mode_str, type_str, purpose_str);
-#endif
 #ifdef O_SYNC
 	/* We let O_SYNC only affect log files; note that we map O_DSYNC to
 	O_SYNC because the datasync options seemed to corrupt files in 2001
diff --git a/storage/innodb_plugin/que/que0que.c b/storage/innodb_plugin/que/que0que.c
index 2fe046fa9b8..b616b3d9c14 100644
--- a/storage/innodb_plugin/que/que0que.c
+++ b/storage/innodb_plugin/que/que0que.c
@@ -1284,18 +1284,13 @@ que_run_threads_low(
 	que_thr_t*	thr)	/*!< in: query thread */
 {
 	que_thr_t*	next_thr;
-	ulint		cumul_resource;
 	ulint		loop_count;
 
 	ut_ad(thr->state == QUE_THR_RUNNING);
 	ut_a(thr_get_trx(thr)->error_state == DB_SUCCESS);
 	ut_ad(!mutex_own(&kernel_mutex));
 
-	/* cumul_resource counts how much resources the OS thread (NOT the
-	query thread) has spent in this function */
-
 	loop_count = QUE_MAX_LOOPS_WITHOUT_CHECK;
-	cumul_resource = 0;
 loop:
 	/* Check that there is enough space in the log to accommodate
 	possible log entries by this query step; if the operation can touch
diff --git a/storage/innodb_plugin/row/row0mysql.c b/storage/innodb_plugin/row/row0mysql.c
index feeb7fc80b7..813a99049fc 100644
--- a/storage/innodb_plugin/row/row0mysql.c
+++ b/storage/innodb_plugin/row/row0mysql.c
@@ -1422,7 +1422,12 @@ run_again:
 		srv_n_rows_updated++;
 	}
 
-	row_update_statistics_if_needed(prebuilt->table);
+	/* We update table statistics only if it is a DELETE or UPDATE
+	that changes indexed columns, UPDATEs that change only non-indexed
+	columns would not affect statistics. */
+	if (node->is_delete || !(node->cmpl_info & UPD_NODE_NO_ORD_CHANGE)) {
+		row_update_statistics_if_needed(prebuilt->table);
+	}
 
 	trx->op_info = "";
 
diff --git a/storage/innodb_plugin/row/row0purge.c b/storage/innodb_plugin/row/row0purge.c
index 835af990672..31b255cf2d4 100644
--- a/storage/innodb_plugin/row/row0purge.c
+++ b/storage/innodb_plugin/row/row0purge.c
@@ -684,7 +684,9 @@ row_purge_step(
 	que_thr_t*	thr)	/*!< in: query thread */
 {
 	purge_node_t*	node;
+#ifdef UNIV_DEBUG
 	ulint		err;
+#endif /* UNIV_DEBUG */
 
 	ut_ad(thr);
 
@@ -692,7 +694,10 @@ row_purge_step(
 
 	ut_ad(que_node_get_type(node) == QUE_NODE_PURGE);
 
-	err = row_purge(node, thr);
+#ifdef UNIV_DEBUG
+	err =
+#endif /* UNIV_DEBUG */
+	row_purge(node, thr);
 
 	ut_ad(err == DB_SUCCESS);
 
diff --git a/storage/innodb_plugin/row/row0umod.c b/storage/innodb_plugin/row/row0umod.c
index 8464b0f95cc..5998dadd16d 100644
--- a/storage/innodb_plugin/row/row0umod.c
+++ b/storage/innodb_plugin/row/row0umod.c
@@ -114,12 +114,17 @@ row_undo_mod_clust_low(
 	btr_pcur_t*	pcur;
 	btr_cur_t*	btr_cur;
 	ulint		err;
+#ifdef UNIV_DEBUG
 	ibool		success;
+#endif /* UNIV_DEBUG */
 
 	pcur = &(node->pcur);
 	btr_cur = btr_pcur_get_btr_cur(pcur);
 
-	success = btr_pcur_restore_position(mode, pcur, mtr);
+#ifdef UNIV_DEBUG
+	success =
+#endif /* UNIV_DEBUG */
+	btr_pcur_restore_position(mode, pcur, mtr);
 
 	ut_ad(success);
 
diff --git a/storage/innodb_plugin/row/row0vers.c b/storage/innodb_plugin/row/row0vers.c
index a4fbb5289aa..b6d35363f08 100644
--- a/storage/innodb_plugin/row/row0vers.c
+++ b/storage/innodb_plugin/row/row0vers.c
@@ -71,7 +71,9 @@ row_vers_impl_x_locked_off_kernel(
 					warning */
 	trx_t*		trx;
 	ulint		rec_del;
+#ifdef UNIV_DEBUG
 	ulint		err;
+#endif /* UNIV_DEBUG */
 	mtr_t		mtr;
 	ulint		comp;
 
@@ -169,9 +171,12 @@ row_vers_impl_x_locked_off_kernel(
 
 		heap2 = heap;
 		heap = mem_heap_create(1024);
-		err = trx_undo_prev_version_build(clust_rec, &mtr, version,
-						  clust_index, clust_offsets,
-						  heap, &prev_version);
+#ifdef UNIV_DEBUG
+		err =
+#endif /* UNIV_DEBUG */
+		trx_undo_prev_version_build(clust_rec, &mtr, version,
+					    clust_index, clust_offsets,
+					    heap, &prev_version);
 		mem_heap_free(heap2); /* free version and clust_offsets */
 
 		if (prev_version == NULL) {
diff --git a/storage/innodb_plugin/trx/trx0purge.c b/storage/innodb_plugin/trx/trx0purge.c
index abbfa3d7f81..1a70750083a 100644
--- a/storage/innodb_plugin/trx/trx0purge.c
+++ b/storage/innodb_plugin/trx/trx0purge.c
@@ -304,9 +304,10 @@ trx_purge_add_update_undo_to_history(
 	trx_undo_t*	undo;
 	trx_rseg_t*	rseg;
 	trx_rsegf_t*	rseg_header;
+#ifdef UNIV_DEBUG
 	trx_usegf_t*	seg_header;
+#endif /* UNIV_DEBUG */
 	trx_ulogf_t*	undo_header;
-	trx_upagef_t*	page_header;
 	ulint		hist_size;
 
 	undo = trx->update_undo;
@@ -321,8 +322,9 @@ trx_purge_add_update_undo_to_history(
 				    rseg->page_no, mtr);
 
 	undo_header = undo_page + undo->hdr_offset;
+#ifdef UNIV_DEBUG
 	seg_header  = undo_page + TRX_UNDO_SEG_HDR;
-	page_header = undo_page + TRX_UNDO_PAGE_HDR;
+#endif /* UNIV_DEBUG */
 
 	if (undo->state != TRX_UNDO_CACHED) {
 		/* The undo log segment will not be reused */
@@ -655,7 +657,6 @@ trx_purge_rseg_get_next_history_log(
 {
 	page_t*		undo_page;
 	trx_ulogf_t*	log_hdr;
-	trx_usegf_t*	seg_hdr;
 	fil_addr_t	prev_log_addr;
 	trx_id_t	trx_no;
 	ibool		del_marks;
@@ -676,7 +677,6 @@ trx_purge_rseg_get_next_history_log(
 	undo_page = trx_undo_page_get_s_latched(rseg->space, rseg->zip_size,
 						rseg->last_page_no, &mtr);
 	log_hdr = undo_page + rseg->last_offset;
-	seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
 
 	/* Increase the purge page count by one for every handled log */
 
@@ -1068,12 +1068,8 @@ trx_purge_rec_release(
 /*==================*/
 	trx_undo_inf_t*	cell)	/*!< in: storage cell */
 {
-	trx_undo_arr_t*	arr;
-
 	mutex_enter(&(purge_sys->mutex));
 
-	arr = purge_sys->arr;
-
 	trx_purge_arr_remove_info(cell);
 
 	mutex_exit(&(purge_sys->mutex));
diff --git a/storage/innodb_plugin/trx/trx0roll.c b/storage/innodb_plugin/trx/trx0roll.c
index c925478cdf4..1a43e419214 100644
--- a/storage/innodb_plugin/trx/trx0roll.c
+++ b/storage/innodb_plugin/trx/trx0roll.c
@@ -740,13 +740,8 @@ trx_undo_arr_remove_info(
 	undo_no_t	undo_no)/*!< in: undo number */
 {
 	trx_undo_inf_t*	cell;
-	ulint		n_used;
-	ulint		n;
 	ulint		i;
 
-	n_used = arr->n_used;
-	n = 0;
-
 	for (i = 0;; i++) {
 		cell = trx_undo_arr_get_nth_info(arr, i);
 
diff --git a/storage/innodb_plugin/trx/trx0sys.c b/storage/innodb_plugin/trx/trx0sys.c
index 410c55f132d..6eb356947cc 100644
--- a/storage/innodb_plugin/trx/trx0sys.c
+++ b/storage/innodb_plugin/trx/trx0sys.c
@@ -241,7 +241,9 @@ trx_sys_create_doublewrite_buf(void)
 {
 	buf_block_t*	block;
 	buf_block_t*	block2;
+#ifdef UNIV_SYNC_DEBUG
 	buf_block_t*	new_block;
+#endif /* UNIV_SYNC_DEBUG */
 	byte*	doublewrite;
 	byte*	fseg_header;
 	ulint	page_no;
@@ -344,8 +346,11 @@ start_again:
 			the page position in the tablespace, then the page
 			has not been written to in doublewrite. */
 
-			new_block = buf_page_get(TRX_SYS_SPACE, 0, page_no,
-						 RW_X_LATCH, &mtr);
+#ifdef UNIV_SYNC_DEBUG
+			new_block =
+#endif /* UNIV_SYNC_DEBUG */
+			buf_page_get(TRX_SYS_SPACE, 0, page_no,
+				     RW_X_LATCH, &mtr);
 			buf_block_dbg_add_level(new_block,
 						SYNC_NO_ORDER_CHECK);
 
diff --git a/storage/innodb_plugin/trx/trx0trx.c b/storage/innodb_plugin/trx/trx0trx.c
index 9722bb59a5e..ee744fd58b1 100644
--- a/storage/innodb_plugin/trx/trx0trx.c
+++ b/storage/innodb_plugin/trx/trx0trx.c
@@ -1805,7 +1805,6 @@ trx_prepare_off_kernel(
 /*===================*/
 	trx_t*	trx)	/*!< in: transaction */
 {
-	page_t*		update_hdr_page;
 	trx_rseg_t*	rseg;
 	ib_uint64_t	lsn		= 0;
 	mtr_t		mtr;
@@ -1838,7 +1837,7 @@ trx_prepare_off_kernel(
 		}
 
 		if (trx->update_undo) {
-			update_hdr_page = trx_undo_set_state_at_prepare(
+			trx_undo_set_state_at_prepare(
 				trx, trx->update_undo, &mtr);
 		}
 
diff --git a/storage/innodb_plugin/trx/trx0undo.c b/storage/innodb_plugin/trx/trx0undo.c
index eb5112c4d31..c8a4b15e48b 100644
--- a/storage/innodb_plugin/trx/trx0undo.c
+++ b/storage/innodb_plugin/trx/trx0undo.c
@@ -1066,14 +1066,11 @@ trx_undo_truncate_end(
 	ulint		last_page_no;
 	trx_undo_rec_t* rec;
 	trx_undo_rec_t* trunc_here;
-	trx_rseg_t*	rseg;
 	mtr_t		mtr;
 
 	ut_ad(mutex_own(&(trx->undo_mutex)));
 	ut_ad(mutex_own(&(trx->rseg->mutex)));
 
-	rseg = trx->rseg;
-
 	for (;;) {
 		mtr_start(&mtr);
 
@@ -1868,7 +1865,6 @@ trx_undo_set_state_at_prepare(
 	mtr_t*		mtr)	/*!< in: mtr */
 {
 	trx_usegf_t*	seg_hdr;
-	trx_upagef_t*	page_hdr;
 	trx_ulogf_t*	undo_header;
 	page_t*		undo_page;
 	ulint		offset;
@@ -1886,7 +1882,6 @@ trx_undo_set_state_at_prepare(
 				      undo->hdr_page_no, mtr);
 
 	seg_hdr = undo_page + TRX_UNDO_SEG_HDR;
-	page_hdr = undo_page + TRX_UNDO_PAGE_HDR;
 
 	/*------------------------------*/
 	undo->state = TRX_UNDO_PREPARED;