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Counting hits for queries in query cache.

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Added hit_count field to Query_cache_query and methods to get and increment it.
The counter is incremented when query results are read from query cache.
This commit is contained in:
Peter Shchuchkin 2017-08-25 12:43:28 +03:00 committed by Sergey Vojtovich
parent 5dd8e1bf2d
commit cf3a74eb60
2 changed files with 5 additions and 1 deletions
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3
sql/sql_cache.cc
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@ -961,7 +961,7 @@ inline void Query_cache_query::unlock_reading()
void Query_cache_query::init_n_lock()
{
DBUG_ENTER("Query_cache_query::init_n_lock");
res=0; wri = 0; len = 0; ready= 0;
res=0; wri = 0; len = 0; ready= 0; hit_count = 0;
mysql_rwlock_init(key_rwlock_query_cache_query_lock, &lock);
lock_writing();
DBUG_PRINT("qcache", ("inited & locked query for block 0x%lx",
@ -2142,6 +2142,7 @@ lookup:
}
move_to_query_list_end(query_block);
hits++;
query->increment_hits();
unlock();
/*

3
sql/sql_cache.h
View File

@ -159,6 +159,7 @@ struct Query_cache_query
unsigned int last_pkt_nr;
uint8 tbls_type;
uint8 ready;
ulonglong hit_count;
Query_cache_query() {} /* Remove gcc warning */
inline void init_n_lock();
@ -184,6 +185,8 @@ struct Query_cache_query
*/
inline void set_results_ready() { ready= 1; }
inline bool is_results_ready() { return ready; }
inline void increment_hits() { hit_count++; }
inline ulong hits() { return hit_count; }
void lock_writing();
void lock_reading();
bool try_lock_writing();