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Bug#28211 RENAME DATABASE and query cache don't play nicely together

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When all table blocks were removed from the query cache the client session
hung in a tight loop waiting on an impossible condition while consuming a lot
of CPU.

This patch also corrects an error which caused valid tables to sometimes be
removed from the query cache.
This commit is contained in:
thek@adventure.(none)
2007-06-18 17:46:29 +02:00
parent 783b1738c7
commit 2da91b2316
3 changed files with 145 additions and 27 deletions
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48
mysql-test/r/query_cache.result
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@@ -1437,3 +1437,51 @@ set GLOBAL query_cache_type=default;
set GLOBAL query_cache_limit=default;
set GLOBAL query_cache_min_res_unit=default;
set GLOBAL query_cache_size= default;
drop database if exists db1;
drop database if exists db2;
set GLOBAL query_cache_size=15*1024*1024;
create database db1;
use db1;
create table t1(c1 int)engine=myisam;
insert into t1(c1) values (1);
select * from db1.t1 f;
c1
1
show status like 'Qcache_queries_in_cache';
Variable_name Value
Qcache_queries_in_cache 1
rename schema db1 to db2;
show status like 'Qcache_queries_in_cache';
Variable_name Value
Qcache_queries_in_cache 0
drop database db2;
set global query_cache_size=default;
drop database if exists db1;
drop database if exists db3;
set GLOBAL query_cache_size=15*1024*1024;
create database db1;
create database db3;
use db1;
create table t1(c1 int) engine=myisam;
use db3;
create table t1(c1 int) engine=myisam;
use db1;
insert into t1(c1) values (1);
use mysql;
select * from db1.t1;
c1
1
select c1+1 from db1.t1;
c1+1
2
select * from db3.t1;
c1
show status like 'Qcache_queries_in_cache';
Variable_name Value
Qcache_queries_in_cache 3
rename schema db1 to db2;
show status like 'Qcache_queries_in_cache';
Variable_name Value
Qcache_queries_in_cache 1
drop database db2;
drop database db3;