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InnoDB: Do not get a lock for consistent reads (Bug #3894)

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marko@hundin.mysql.fi 2004-05-31 16:33:45 +03:00
parent ce55ee9cd9
commit df8f605609
1 changed files with 11 additions and 0 deletions
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11
sql/ha_innodb.cc
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@ -4504,6 +4504,17 @@ ha_innobase::start_stmt(
prepared for an update of a row */
prebuilt->select_lock_type = LOCK_X;
} else {
/* For other than temporary tables, we obtain
no lock for consistent read (plain SELECT), and
an exclusive lock for SELECT ... FOR UPDATE or
SELECT ... LOCK IN SHARE MODE. */
prebuilt->select_lock_type =
thd->lex.sql_command == SQLCOM_SELECT
&& thd->lex.lock_option == TL_READ
? LOCK_NONE
: LOCK_X;
}
/* Set the MySQL flag to mark that there is an active transaction */