Commit 1dff7838 authored by bell@52.0.168.192.in-addr.arpa's avatar bell@52.0.168.192.in-addr.arpa
Browse files

block using QC in case of having tables locked by LOCK... (BUG#12385)

parent 518745ab

mysql-test/r/query_cache_noembeded.result

0 → 100644
+18 −0
Original line number Diff line number Diff line 
set GLOBAL query_cache_size=1355776;

reset query cache;

flush status;

CREATE TABLE t1 ( a INT NOT NULL PRIMARY KEY AUTO_INCREMENT ) ENGINE =

MyISAM;

LOCK TABLE t1 READ LOCAL;

INSERT INTO t1 VALUES (), (), ();

SELECT * FROM t1;

a

SELECT * FROM t1;

a

1

2

3

SELECT * FROM t1;

a

drop table t1;

set GLOBAL query_cache_size=default;

mysql-test/t/query_cache_noembeded.test

0 → 100644
+33 −0
Original line number Diff line number Diff line 
-- source include/have_query_cache.inc

-- source include/not_embedded.inc



#

# Tests with query cache

#

set GLOBAL query_cache_size=1355776;



# Reset query cache variables.



reset query cache;

flush status;



#

# do not use QC if tables locked (BUG#12385)

#

connect (root,localhost,root,,test,$MASTER_MYPORT,master.sock);

connection root;

CREATE TABLE t1 ( a INT NOT NULL PRIMARY KEY AUTO_INCREMENT ) ENGINE =

MyISAM;

LOCK TABLE t1 READ LOCAL;

connect (root2,localhost,root,,test,$MASTER_MYPORT,master.sock);

connection root2;

INSERT INTO t1 VALUES (), (), ();

connection root;

SELECT * FROM t1;

connection root2;

SELECT * FROM t1;

connection root;

SELECT * FROM t1;

drop table t1;



set GLOBAL query_cache_size=default;

sql/sql_cache.cc

+5 −2
Original line number Diff line number Diff line
@@ -739,7 +739,7 @@ void Query_cache::store_query(THD *thd, TABLE_LIST *tables_used) 
  TABLE_COUNTER_TYPE local_tables;

  ulong tot_length;

  DBUG_ENTER("Query_cache::store_query");

  if (query_cache_size == 0)

  if (query_cache_size == 0 || thd->locked_tables)

    DBUG_VOID_RETURN;



  if ((local_tables= is_cacheable(thd, thd->query_length,
@@ -750,7 +750,10 @@ void Query_cache::store_query(THD *thd, TABLE_LIST *tables_used) 
    STRUCT_LOCK(&structure_guard_mutex);



    if (query_cache_size == 0)

    {

      STRUCT_UNLOCK(&structure_guard_mutex);

      DBUG_VOID_RETURN;

    }

    DUMP(this);



    /* Key is query + database + flag */
@@ -874,7 +877,7 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length) 
  byte flags;

  DBUG_ENTER("Query_cache::send_result_to_client");



  if (query_cache_size == 0 ||

  if (query_cache_size == 0 || thd->locked_tables ||

      /*

	it is not possible to check has_transactions() function of handler

	because tables not opened yet