database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

MDEV-17255: New optimizer defaults and ANALYZE TABLE

Browse Source 
Added to new values to the server variable use_stat_tables.
The values are COMPLEMENTARY_FOR_QUERIES and PREFERABLY_FOR_QUERIES.
Both these values don't allow to collect EITS for queries like
    analyze table t1;
To collect EITS we would need to use the syntax with persistent like
   analyze table t1 persistent for columns (col1,col2...) index (idx1, idx2...) / ALL

Changing the default value from NEVER to PREFERABLY_FOR_QUERIES.
This commit is contained in:
Varun Gupta
2018-12-09 13:25:27 +05:30
parent 93c360e3a5
commit 9207a838ed
12 changed files with 199 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
sql/sql_statistics.h
View File

@ -16,12 +16,26 @@
#ifndef SQL_STATISTICS_H
#define SQL_STATISTICS_H
/*
For COMPLEMENTARY_FOR_QUERIES and PREFERABLY_FOR_QUERIES they are
similar to the COMPLEMENTARY and PREFERABLY respectively except that
with these values we would not be collecting EITS for queries like
ANALYZE TABLE t1;
To collect EITS with these values, we have to use PERSISITENT FOR
analyze table t1 persistent for
columns (col1,col2...) index (idx1, idx2...)
or
analyze table t1 persistent for all
*/
typedef
enum enum_use_stat_tables_mode
{
NEVER,
COMPLEMENTARY,
PREFERABLY,
COMPLEMENTARY_FOR_QUERIES,
PREFERABLY_FOR_QUERIES
} Use_stat_tables_mode;
typedef
@ -87,6 +101,19 @@ Use_stat_tables_mode get_use_stat_tables_mode(THD *thd)
{
return (Use_stat_tables_mode) (thd->variables.use_stat_tables);
}
inline
bool check_eits_collection_allowed(THD *thd)
{
return (get_use_stat_tables_mode(thd) == COMPLEMENTARY ||
get_use_stat_tables_mode(thd) == PREFERABLY);
}
inline
bool check_eits_preferred(THD *thd)
{
return (get_use_stat_tables_mode(thd) == PREFERABLY ||
get_use_stat_tables_mode(thd) == PREFERABLY_FOR_QUERIES);
}
int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables);
int collect_statistics_for_table(THD *thd, TABLE *table);