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Change the default @@optimizer_switch settings:

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- semijoin=on
- firstmatch=on
- loosescan=on
This commit is contained in:
Sergey Petrunya
2011-11-02 13:48:41 +04:00
parent 6498687325
commit 47861a6577
18 changed files with 861 additions and 98 deletions
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5
sql/mysql_priv.h
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@ -609,7 +609,10 @@ enabled by default, add OPTIMIZER_SWITCH_MATERIALIZATION
OPTIMIZER_SWITCH_JOIN_CACHE_INCREMENTAL | \
OPTIMIZER_SWITCH_JOIN_CACHE_HASHED | \
OPTIMIZER_SWITCH_JOIN_CACHE_BKA | \
OPTIMIZER_SWITCH_SUBQUERY_CACHE)
OPTIMIZER_SWITCH_SUBQUERY_CACHE |\
OPTIMIZER_SWITCH_SEMIJOIN | \
OPTIMIZER_SWITCH_FIRSTMATCH | \
OPTIMIZER_SWITCH_LOOSE_SCAN )
/*
Replication uses 8 bytes to store SQL_MODE in the binary log. The day you