database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

Bug#38551 query cache can still consume [very little] cpu time even when it is off.

Browse Source 
When the query cache is disabled, the server shouldn't attempt to take the 
query cache mutex.
                             
By using the command line option --query_cache_type=0, the user can disable
   
(backport from mysql-pe)
This commit is contained in:
Kristofer Pettersson
2009-10-29 12:19:36 +01:00
parent 800ba382d9
commit 2d6a356abf
7 changed files with 124 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
sql/sql_cache.h
View File

@ -281,8 +281,11 @@ private:
enum Cache_lock_status { UNLOCKED, LOCKED_NO_WAIT, LOCKED };
Cache_lock_status m_cache_lock_status;
bool m_query_cache_is_disabled;
void free_query_internal(Query_cache_block *point);
void invalidate_table_internal(THD *thd, uchar *key, uint32 key_length);
void disable_query_cache(void) { m_query_cache_is_disabled= TRUE; }
protected:
/*
@ -426,6 +429,8 @@ protected:
uint def_query_hash_size = QUERY_CACHE_DEF_QUERY_HASH_SIZE,
uint def_table_hash_size = QUERY_CACHE_DEF_TABLE_HASH_SIZE);
bool is_disabled(void) { return m_query_cache_is_disabled; }
/* initialize cache (mutex) */
void init();
/* resize query cache (return real query size, 0 if disabled) */