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5.5 merge

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This commit is contained in:
Sergei Golubchik 2014-11-20 16:07:34 +01:00
commit 3c12c27907
14 changed files with 351 additions and 14 deletions
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56
mysql-test/suite/sys_vars/r/innodb_stats_modified_counter_basic.result Normal file
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@ -0,0 +1,56 @@
SET @start_global_value = @@global.innodb_stats_modified_counter;
SELECT @start_global_value;
@start_global_value
0
Valid values are one or above
select @@global.innodb_stats_modified_counter >=1;
@@global.innodb_stats_modified_counter >=1
0
select @@global.innodb_stats_modified_counter;
@@global.innodb_stats_modified_counter
0
select @@session.innodb_stats_modified_counter;
ERROR HY000: Variable 'innodb_stats_modified_counter' is a GLOBAL variable
show global variables like 'innodb_stats_modified_counter';
Variable_name Value
innodb_stats_modified_counter 0
show session variables like 'innodb_stats_modified_counter';
Variable_name Value
innodb_stats_modified_counter 0
select * from information_schema.global_variables where variable_name='innodb_stats_modified_counter';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_MODIFIED_COUNTER 0
select * from information_schema.session_variables where variable_name='innodb_stats_modified_counter';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_MODIFIED_COUNTER 0
set global innodb_stats_modified_counter=10;
select @@global.innodb_stats_modified_counter;
@@global.innodb_stats_modified_counter
10
select * from information_schema.global_variables where variable_name='innodb_stats_modified_counter';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_MODIFIED_COUNTER 10
select * from information_schema.session_variables where variable_name='innodb_stats_modified_counter';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_MODIFIED_COUNTER 10
set session innodb_stats_modified_counter=1;
ERROR HY000: Variable 'innodb_stats_modified_counter' is a GLOBAL variable and should be set with SET GLOBAL
set global innodb_stats_modified_counter=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_stats_modified_counter'
set global innodb_stats_modified_counter=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_stats_modified_counter'
set global innodb_stats_modified_counter="foo";
ERROR 42000: Incorrect argument type to variable 'innodb_stats_modified_counter'
set global innodb_stats_modified_counter=-7;
Warnings:
Warning 1292 Truncated incorrect innodb_stats_modified_counter value: '-7'
select @@global.innodb_stats_modified_counter;
@@global.innodb_stats_modified_counter
0
select * from information_schema.global_variables where variable_name='innodb_stats_modified_counter';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_MODIFIED_COUNTER 0
SET @@global.innodb_stats_modified_counter = @start_global_value;
SELECT @@global.innodb_stats_modified_counter;
@@global.innodb_stats_modified_counter
0

92
mysql-test/suite/sys_vars/r/innodb_stats_traditional_basic.result Normal file
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@ -0,0 +1,92 @@
SET @start_global_value = @@global.innodb_stats_traditional;
SELECT @start_global_value;
@start_global_value
0
Valid values are 'ON' and 'OFF'
select @@global.innodb_stats_traditional in (0, 1);
@@global.innodb_stats_traditional in (0, 1)
1
select @@global.innodb_stats_traditional;
@@global.innodb_stats_traditional
0
select @@session.innodb_stats_traditional;
ERROR HY000: Variable 'innodb_stats_traditional' is a GLOBAL variable
show global variables like 'innodb_stats_traditional';
Variable_name Value
innodb_stats_traditional OFF
show session variables like 'innodb_stats_traditional';
Variable_name Value
innodb_stats_traditional OFF
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL OFF
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL OFF
set global innodb_stats_traditional='OFF';
select @@global.innodb_stats_traditional;
@@global.innodb_stats_traditional
0
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL OFF
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL OFF
set @@global.innodb_stats_traditional=1;
select @@global.innodb_stats_traditional;
@@global.innodb_stats_traditional
1
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL ON
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL ON
set global innodb_stats_traditional=0;
select @@global.innodb_stats_traditional;
@@global.innodb_stats_traditional
0
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL OFF
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL OFF
set @@global.innodb_stats_traditional='ON';
select @@global.innodb_stats_traditional;
@@global.innodb_stats_traditional
1
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL ON
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL ON
set session innodb_stats_traditional='OFF';
ERROR HY000: Variable 'innodb_stats_traditional' is a GLOBAL variable and should be set with SET GLOBAL
set @@session.innodb_stats_traditional='ON';
ERROR HY000: Variable 'innodb_stats_traditional' is a GLOBAL variable and should be set with SET GLOBAL
set global innodb_stats_traditional=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_stats_traditional'
set global innodb_stats_traditional=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_stats_traditional'
set global innodb_stats_traditional=2;
ERROR 42000: Variable 'innodb_stats_traditional' can't be set to the value of '2'
set global innodb_stats_traditional=-3;
ERROR 42000: Variable 'innodb_stats_traditional' can't be set to the value of '-3'
select @@global.innodb_stats_traditional;
@@global.innodb_stats_traditional
1
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL ON
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
VARIABLE_NAME VARIABLE_VALUE
INNODB_STATS_TRADITIONAL ON
set global innodb_stats_traditional='AUTO';
ERROR 42000: Variable 'innodb_stats_traditional' can't be set to the value of 'AUTO'
SET @@global.innodb_stats_traditional = @start_global_value;
SELECT @@global.innodb_stats_traditional;
@@global.innodb_stats_traditional
0

47
mysql-test/suite/sys_vars/t/innodb_stats_modified_counter_basic.test Normal file
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@ -0,0 +1,47 @@
--source include/have_innodb.inc
SET @start_global_value = @@global.innodb_stats_modified_counter;
SELECT @start_global_value;
#
# exists as global only
#
--echo Valid values are one or above
select @@global.innodb_stats_modified_counter >=1;
select @@global.innodb_stats_modified_counter;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.innodb_stats_modified_counter;
show global variables like 'innodb_stats_modified_counter';
show session variables like 'innodb_stats_modified_counter';
select * from information_schema.global_variables where variable_name='innodb_stats_modified_counter';
select * from information_schema.session_variables where variable_name='innodb_stats_modified_counter';
#
# show that it's writable
#
set global innodb_stats_modified_counter=10;
select @@global.innodb_stats_modified_counter;
select * from information_schema.global_variables where variable_name='innodb_stats_modified_counter';
select * from information_schema.session_variables where variable_name='innodb_stats_modified_counter';
--error ER_GLOBAL_VARIABLE
set session innodb_stats_modified_counter=1;
#
# incorrect types
#
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_stats_modified_counter=1.1;
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_stats_modified_counter=1e1;
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_stats_modified_counter="foo";
set global innodb_stats_modified_counter=-7;
select @@global.innodb_stats_modified_counter;
select * from information_schema.global_variables where variable_name='innodb_stats_modified_counter';
#
# cleanup
#
SET @@global.innodb_stats_modified_counter = @start_global_value;
SELECT @@global.innodb_stats_modified_counter;

65
mysql-test/suite/sys_vars/t/innodb_stats_traditional_basic.test Normal file
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@ -0,0 +1,65 @@
--source include/have_innodb.inc
SET @start_global_value = @@global.innodb_stats_traditional;
SELECT @start_global_value;
#
# exists as global only
#
--echo Valid values are 'ON' and 'OFF'
select @@global.innodb_stats_traditional in (0, 1);
select @@global.innodb_stats_traditional;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.innodb_stats_traditional;
show global variables like 'innodb_stats_traditional';
show session variables like 'innodb_stats_traditional';
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
#
# show that it's writable
#
set global innodb_stats_traditional='OFF';
select @@global.innodb_stats_traditional;
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
set @@global.innodb_stats_traditional=1;
select @@global.innodb_stats_traditional;
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
set global innodb_stats_traditional=0;
select @@global.innodb_stats_traditional;
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
set @@global.innodb_stats_traditional='ON';
select @@global.innodb_stats_traditional;
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
--error ER_GLOBAL_VARIABLE
set session innodb_stats_traditional='OFF';
--error ER_GLOBAL_VARIABLE
set @@session.innodb_stats_traditional='ON';
#
# incorrect types
#
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_stats_traditional=1.1;
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_stats_traditional=1e1;
--error ER_WRONG_VALUE_FOR_VAR
set global innodb_stats_traditional=2;
--error ER_WRONG_VALUE_FOR_VAR
set global innodb_stats_traditional=-3;
select @@global.innodb_stats_traditional;
select * from information_schema.global_variables where variable_name='innodb_stats_traditional';
select * from information_schema.session_variables where variable_name='innodb_stats_traditional';
--error ER_WRONG_VALUE_FOR_VAR
set global innodb_stats_traditional='AUTO';
#
# Cleanup
#
SET @@global.innodb_stats_traditional = @start_global_value;
SELECT @@global.innodb_stats_traditional;

25
storage/innobase/btr/btr0cur.cc
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@ -3870,16 +3870,29 @@ btr_estimate_number_of_different_key_vals(
ut_error; ut_error;
} }
/* It makes no sense to test more pages than are contained if (srv_stats_sample_traditional) {
in the index, thus we lower the number if it is too high */ /* It makes no sense to test more pages than are contained
if (srv_stats_transient_sample_pages > index->stat_index_size) { in the index, thus we lower the number if it is too high */
if (srv_stats_transient_sample_pages > index->stat_index_size) {
if (index->stat_index_size > 0) {
n_sample_pages = index->stat_index_size;
} else {
n_sample_pages = 1;
}
} else {
n_sample_pages = srv_stats_transient_sample_pages;
}
} else {
/* New logaritmic number of pages that are estimated. We
first pick minimun from srv_stats_transient_sample_pages and number of
pages on index. Then we pick maximum from previous number of
pages and log2(number of index pages) * srv_stats_transient_sample_pages. */
if (index->stat_index_size > 0) { if (index->stat_index_size > 0) {
n_sample_pages = index->stat_index_size; n_sample_pages = ut_max(ut_min(srv_stats_transient_sample_pages, index->stat_index_size),
log2(index->stat_index_size)*srv_stats_transient_sample_pages);
} else { } else {
n_sample_pages = 1; n_sample_pages = 1;
} }
} else {
n_sample_pages = srv_stats_transient_sample_pages;
} }
/* We sample some pages in the index to get an estimate */ /* We sample some pages in the index to get an estimate */

12
storage/innobase/handler/ha_innodb.cc
View File

@ -16364,6 +16364,16 @@ static MYSQL_SYSVAR_ULONGLONG(stats_persistent_sample_pages,
"statistics (by ANALYZE, default 20)", "statistics (by ANALYZE, default 20)",
NULL, NULL, 20, 1, ~0ULL, 0); NULL, NULL, 20, 1, ~0ULL, 0);
static MYSQL_SYSVAR_ULONGLONG(stats_modified_counter, srv_stats_modified_counter,
PLUGIN_VAR_RQCMDARG,
"The number of rows modified before we calculate new statistics (default 0 = current limits)",
NULL, NULL, 0, 0, ~0ULL, 0);
static MYSQL_SYSVAR_BOOL(stats_traditional, srv_stats_sample_traditional,
PLUGIN_VAR_RQCMDARG,
"Enable traditional statistic calculation based on number of configured pages (default false)",
NULL, NULL, FALSE);
static MYSQL_SYSVAR_BOOL(adaptive_hash_index, btr_search_enabled, static MYSQL_SYSVAR_BOOL(adaptive_hash_index, btr_search_enabled,
PLUGIN_VAR_OPCMDARG, PLUGIN_VAR_OPCMDARG,
"Enable InnoDB adaptive hash index (enabled by default). " "Enable InnoDB adaptive hash index (enabled by default). "
@ -16989,6 +16999,8 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
MYSQL_SYSVAR(stats_persistent), MYSQL_SYSVAR(stats_persistent),
MYSQL_SYSVAR(stats_persistent_sample_pages), MYSQL_SYSVAR(stats_persistent_sample_pages),
MYSQL_SYSVAR(stats_auto_recalc), MYSQL_SYSVAR(stats_auto_recalc),
MYSQL_SYSVAR(stats_modified_counter),
MYSQL_SYSVAR(stats_traditional),
MYSQL_SYSVAR(adaptive_hash_index), MYSQL_SYSVAR(adaptive_hash_index),
MYSQL_SYSVAR(stats_method), MYSQL_SYSVAR(stats_method),
MYSQL_SYSVAR(replication_delay), MYSQL_SYSVAR(replication_delay),

2
storage/innobase/include/srv0srv.h
View File

@ -356,6 +356,8 @@ extern unsigned long long srv_stats_transient_sample_pages;
extern my_bool srv_stats_persistent; extern my_bool srv_stats_persistent;
extern unsigned long long srv_stats_persistent_sample_pages; extern unsigned long long srv_stats_persistent_sample_pages;
extern my_bool srv_stats_auto_recalc; extern my_bool srv_stats_auto_recalc;
extern unsigned long long srv_stats_modified_counter;
extern my_bool srv_stats_sample_traditional;
extern ibool srv_use_doublewrite_buf; extern ibool srv_use_doublewrite_buf;
extern ulong srv_doublewrite_batch_size; extern ulong srv_doublewrite_batch_size;

6
storage/innobase/row/row0mysql.cc
View File

@ -1055,8 +1055,12 @@ row_update_statistics_if_needed(
since the last time a statistics batch was run. since the last time a statistics batch was run.
We calculate statistics at most every 16th round, since we may have We calculate statistics at most every 16th round, since we may have
a counter table which is very small and updated very often. */ a counter table which is very small and updated very often. */
ib_uint64_t threshold= 16 + n_rows / 16; /* 6.25% */
if (srv_stats_modified_counter)
threshold= ut_min(srv_stats_modified_counter, threshold);
if (counter > 16 + n_rows / 16 /* 6.25% */) { if (counter > threshold) {
ib_uint64_t threshold= 16 + n_rows / 16; /* 6.25% */
ut_ad(!mutex_own(&dict_sys->mutex)); ut_ad(!mutex_own(&dict_sys->mutex));
/* this will reset table->stat_modified_counter to 0 */ /* this will reset table->stat_modified_counter to 0 */

8
storage/innobase/srv/srv0srv.cc
View File

@ -340,6 +340,14 @@ UNIV_INTERN my_bool srv_stats_persistent = TRUE;
UNIV_INTERN unsigned long long srv_stats_persistent_sample_pages = 20; UNIV_INTERN unsigned long long srv_stats_persistent_sample_pages = 20;
UNIV_INTERN my_bool srv_stats_auto_recalc = TRUE; UNIV_INTERN my_bool srv_stats_auto_recalc = TRUE;
/* The number of rows modified before we calculate new statistics (default 0
= current limits) */
UNIV_INTERN unsigned long long srv_stats_modified_counter = 0;
/* Enable traditional statistic calculation based on number of configured
pages default false. */
UNIV_INTERN my_bool srv_stats_sample_traditional = FALSE;
UNIV_INTERN ibool srv_use_doublewrite_buf = TRUE; UNIV_INTERN ibool srv_use_doublewrite_buf = TRUE;
/** doublewrite buffer is 1MB is size i.e.: it can hold 128 16K pages. /** doublewrite buffer is 1MB is size i.e.: it can hold 128 16K pages.

25
storage/xtradb/btr/btr0cur.cc
View File

@ -4061,16 +4061,29 @@ btr_estimate_number_of_different_key_vals(
ut_error; ut_error;
} }
/* It makes no sense to test more pages than are contained if (srv_stats_sample_traditional) {
in the index, thus we lower the number if it is too high */ /* It makes no sense to test more pages than are contained
if (srv_stats_transient_sample_pages > index->stat_index_size) { in the index, thus we lower the number if it is too high */
if (srv_stats_transient_sample_pages > index->stat_index_size) {
if (index->stat_index_size > 0) {
n_sample_pages = index->stat_index_size;
} else {
n_sample_pages = 1;
}
} else {
n_sample_pages = srv_stats_transient_sample_pages;
}
} else {
/* New logaritmic number of pages that are estimated. We
first pick minimun from srv_stats_transient_sample_pages and number of
pages on index. Then we pick maximum from previous number of
pages and log2(number of index pages) * srv_stats_transient_sample_pages. */
if (index->stat_index_size > 0) { if (index->stat_index_size > 0) {
n_sample_pages = index->stat_index_size; n_sample_pages = ut_max(ut_min(srv_stats_transient_sample_pages, index->stat_index_size),
log2(index->stat_index_size)*srv_stats_transient_sample_pages);
} else { } else {
n_sample_pages = 1; n_sample_pages = 1;
} }
} else {
n_sample_pages = srv_stats_transient_sample_pages;
} }
/* We sample some pages in the index to get an estimate */ /* We sample some pages in the index to get an estimate */

12
storage/xtradb/handler/ha_innodb.cc
View File

@ -17462,6 +17462,16 @@ static MYSQL_SYSVAR_ULONGLONG(stats_persistent_sample_pages,
"statistics (by ANALYZE, default 20)", "statistics (by ANALYZE, default 20)",
NULL, NULL, 20, 1, ~0ULL, 0); NULL, NULL, 20, 1, ~0ULL, 0);
static MYSQL_SYSVAR_ULONGLONG(stats_modified_counter, srv_stats_modified_counter,
PLUGIN_VAR_RQCMDARG,
"The number of rows modified before we calculate new statistics (default 0 = current limits)",
NULL, NULL, 0, 0, ~0ULL, 0);
static MYSQL_SYSVAR_BOOL(stats_traditional, srv_stats_sample_traditional,
PLUGIN_VAR_RQCMDARG,
"Enable traditional statistic calculation based on number of configured pages (default false)",
NULL, NULL, FALSE);
static MYSQL_SYSVAR_BOOL(adaptive_hash_index, btr_search_enabled, static MYSQL_SYSVAR_BOOL(adaptive_hash_index, btr_search_enabled,
PLUGIN_VAR_OPCMDARG, PLUGIN_VAR_OPCMDARG,
"Enable InnoDB adaptive hash index (enabled by default). " "Enable InnoDB adaptive hash index (enabled by default). "
@ -18284,6 +18294,8 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
MYSQL_SYSVAR(stats_persistent), MYSQL_SYSVAR(stats_persistent),
MYSQL_SYSVAR(stats_persistent_sample_pages), MYSQL_SYSVAR(stats_persistent_sample_pages),
MYSQL_SYSVAR(stats_auto_recalc), MYSQL_SYSVAR(stats_auto_recalc),
MYSQL_SYSVAR(stats_modified_counter),
MYSQL_SYSVAR(stats_traditional),
MYSQL_SYSVAR(adaptive_hash_index), MYSQL_SYSVAR(adaptive_hash_index),
MYSQL_SYSVAR(adaptive_hash_index_partitions), MYSQL_SYSVAR(adaptive_hash_index_partitions),
MYSQL_SYSVAR(stats_method), MYSQL_SYSVAR(stats_method),

2
storage/xtradb/include/srv0srv.h
View File

@ -427,6 +427,8 @@ extern unsigned long long srv_stats_transient_sample_pages;
extern my_bool srv_stats_persistent; extern my_bool srv_stats_persistent;
extern unsigned long long srv_stats_persistent_sample_pages; extern unsigned long long srv_stats_persistent_sample_pages;
extern my_bool srv_stats_auto_recalc; extern my_bool srv_stats_auto_recalc;
extern unsigned long long srv_stats_modified_counter;
extern my_bool srv_stats_sample_traditional;
extern ibool srv_use_doublewrite_buf; extern ibool srv_use_doublewrite_buf;
extern ulong srv_doublewrite_batch_size; extern ulong srv_doublewrite_batch_size;

5
storage/xtradb/row/row0mysql.cc
View File

@ -1054,8 +1054,11 @@ row_update_statistics_if_needed(
since the last time a statistics batch was run. since the last time a statistics batch was run.
We calculate statistics at most every 16th round, since we may have We calculate statistics at most every 16th round, since we may have
a counter table which is very small and updated very often. */ a counter table which is very small and updated very often. */
ib_uint64_t threshold= 16 + n_rows / 16; /* 6.25% */
if (srv_stats_modified_counter)
threshold= ut_min(srv_stats_modified_counter, threshold);
if (counter > 16 + n_rows / 16 /* 6.25% */) { if (counter > threshold) {
ut_ad(!mutex_own(&dict_sys->mutex)); ut_ad(!mutex_own(&dict_sys->mutex));
/* this will reset table->stat_modified_counter to 0 */ /* this will reset table->stat_modified_counter to 0 */

8
storage/xtradb/srv/srv0srv.cc
View File

@ -457,6 +457,14 @@ UNIV_INTERN my_bool srv_stats_persistent = TRUE;
UNIV_INTERN unsigned long long srv_stats_persistent_sample_pages = 20; UNIV_INTERN unsigned long long srv_stats_persistent_sample_pages = 20;
UNIV_INTERN my_bool srv_stats_auto_recalc = TRUE; UNIV_INTERN my_bool srv_stats_auto_recalc = TRUE;
/* The number of rows modified before we calculate new statistics (default 0
= current limits) */
UNIV_INTERN unsigned long long srv_stats_modified_counter = 0;
/* Enable traditional statistic calculation based on number of configured
pages default false. */
UNIV_INTERN my_bool srv_stats_sample_traditional = FALSE;
UNIV_INTERN ibool srv_use_doublewrite_buf = TRUE; UNIV_INTERN ibool srv_use_doublewrite_buf = TRUE;
UNIV_INTERN ibool srv_use_atomic_writes = FALSE; UNIV_INTERN ibool srv_use_atomic_writes = FALSE;
#ifdef HAVE_POSIX_FALLOCATE #ifdef HAVE_POSIX_FALLOCATE