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1ee8a58882
------------------------------------------------------------ revno: 2476.784.3 committer: davi@moksha.local timestamp: Tue 2007-10-02 21:27:31 -0300 message: Bug#25858 Some DROP TABLE under LOCK TABLES can cause deadlocks When a client (connection) holds a lock on a table and attempts to drop (obtain a exclusive lock) on a second table that is already held by a second client and the second client then attempts to drop the table that is held by the first client, leads to a circular wait deadlock. This scenario is very similar to trying to drop (or rename) a table while holding read locks and are correctly forbidden. The solution is to allow a drop table operation to continue only if the table being dropped is write (exclusively) locked, or if the table is temporary, or if the client is not holding any locks. Using this scheme prevents the creation of a circular chain in which each client is waiting for one table that the next client in the chain is holding. This is incompatible change, as can be seen by number of tests cases that needed to be fixed, but is consistent with respect to behavior of the different scenarios in which the circular wait might happen.
385 lines
6.6 KiB
Text
385 lines
6.6 KiB
Text
set GLOBAL query_cache_size=1355776;
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flush query cache;
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flush query cache;
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reset query cache;
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flush status;
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drop table if exists t1, t2, t3, t11, t21;
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create table t1 (a int not null);
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insert into t1 values (1),(2),(3);
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create table t2 (a int not null);
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insert into t2 values (1),(2),(3);
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select * from t1;
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a
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1
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2
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3
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select * from t2;
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a
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1
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2
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3
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insert into t1 values (4);
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show status like "Qcache_free_blocks";
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Variable_name Value
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Qcache_free_blocks 2
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flush query cache;
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show status like "Qcache_free_blocks";
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Variable_name Value
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Qcache_free_blocks 1
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drop table t1, t2;
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create table t1 (a text not null);
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create table t11 (a text not null);
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create table t2 (a text not null);
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create table t21 (a text not null);
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create table t3 (a text not null);
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insert into t1 values("1111111111111111111111111111111111111111111111111111");
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t11 select * from t1;
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insert into t21 select * from t1;
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insert into t1 select * from t2;
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insert into t2 select * from t1;
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insert into t1 select * from t2;
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insert into t3 select * from t1;
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insert into t3 select * from t2;
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insert into t3 select * from t1;
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select * from t11;
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select * from t21;
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show status like "Qcache_total_blocks";
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Variable_name Value
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Qcache_total_blocks 7
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show status like "Qcache_free_blocks";
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Variable_name Value
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Qcache_free_blocks 1
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insert into t11 values("");
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select * from t3;
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show status like "Qcache_total_blocks";
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Variable_name Value
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Qcache_total_blocks 8
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show status like "Qcache_free_blocks";
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Variable_name Value
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Qcache_free_blocks 1
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flush query cache;
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show status like "Qcache_total_blocks";
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Variable_name Value
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Qcache_total_blocks 7
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show status like "Qcache_free_blocks";
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Variable_name Value
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Qcache_free_blocks 1
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drop table t1, t2, t3, t11, t21;
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CREATE TABLE t1 ( a INT NOT NULL PRIMARY KEY AUTO_INCREMENT ) ENGINE =
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MyISAM;
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LOCK TABLE t1 READ LOCAL;
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INSERT INTO t1 VALUES (), (), ();
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SELECT * FROM t1;
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a
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SELECT * FROM t1;
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a
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1
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2
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3
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SELECT * FROM t1;
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a
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UNLOCK TABLES;
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drop table t1;
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flush query cache;
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reset query cache;
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flush status;
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create table t1 (s1 int)//
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create procedure f1 () begin
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select sql_cache * from t1;
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select sql_cache * from t1;
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select sql_cache * from t1;
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end;//
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create procedure f2 () begin
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select sql_cache * from t1 where s1=1;
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select sql_cache * from t1;
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end;//
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create procedure f3 () begin
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select sql_cache * from t1;
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select sql_cache * from t1 where s1=1;
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end;//
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create procedure f4 () begin
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select sql_cache * from t1;
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select sql_cache * from t1 where s1=1;
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select sql_cache * from t1;
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select sql_cache * from t1 where s1=1;
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select sql_cache * from t1 where s1=1;
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end;//
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call f1();
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s1
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s1
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s1
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 3
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show status like "Qcache_inserts";
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Variable_name Value
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Qcache_inserts 3
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 0
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call f1();
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s1
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s1
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s1
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 3
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show status like "Qcache_inserts";
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Variable_name Value
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Qcache_inserts 3
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 3
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call f1();
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s1
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s1
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s1
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select sql_cache * from t1;
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s1
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 4
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show status like "Qcache_inserts";
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Variable_name Value
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Qcache_inserts 4
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 6
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insert into t1 values (1);
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select sql_cache * from t1;
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s1
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1
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 1
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show status like "Qcache_inserts";
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Variable_name Value
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Qcache_inserts 5
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 6
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call f1();
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s1
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1
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s1
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1
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s1
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1
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call f1();
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s1
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1
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s1
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1
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s1
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1
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select sql_cache * from t1;
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s1
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1
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show status like "Qcache_queries_in_cache";
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Variable_name Value
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Qcache_queries_in_cache 4
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show status like "Qcache_inserts";
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Variable_name Value
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Qcache_inserts 8
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show status like "Qcache_hits";
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Variable_name Value
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Qcache_hits 10
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flush query cache;
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reset query cache;
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flush status;
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select sql_cache * from t1;
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s1
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1
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select sql_cache * from t1 where s1=1;
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s1
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1
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call f1();
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s1
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1
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s1
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1
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s1
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1
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call f2();
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s1
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1
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s1
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1
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call f3();
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s1
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1
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s1
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1
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call f4();
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s1
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1
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s1
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1
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s1
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1
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s1
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1
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s1
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1
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call f4();
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s1
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1
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s1
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1
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s1
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1
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s1
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1
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s1
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1
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call f3();
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s1
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1
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s1
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1
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call f2();
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s1
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1
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s1
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1
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select sql_cache * from t1 where s1=1;
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s1
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1
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insert into t1 values (2);
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call f1();
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s1
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1
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2
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s1
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1
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2
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s1
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1
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2
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select sql_cache * from t1 where s1=1;
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s1
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1
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select sql_cache * from t1;
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s1
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1
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2
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call f1();
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s1
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1
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2
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s1
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1
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2
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s1
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1
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2
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call f3();
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s1
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1
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2
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s1
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1
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call f3();
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s1
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1
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2
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s1
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1
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call f1();
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s1
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1
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2
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s1
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1
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2
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s1
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1
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2
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drop procedure f1;
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drop procedure f2;
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drop procedure f3;
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drop procedure f4;
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drop table t1;
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SET @old_log_bin_trust_function_creators= @@global.log_bin_trust_function_creators;
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SET GLOBAL log_bin_trust_function_creators = 1;
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reset query cache;
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drop function if exists f1;
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create table t1 (id int);
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create function f1 ()
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returns int
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begin
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declare i_var int;
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set i_var = sleep(3);
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insert into t1 values(3);
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set i_var = sleep(3);
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return 0;
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end;|
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select f1();
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select sleep(4);
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sleep(4)
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0
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select * from t1;
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id
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3
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f1()
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0
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select * from t1;
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id
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3
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reset query cache;
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select * from t1;
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id
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3
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drop table t1;
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drop function f1;
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set GLOBAL query_cache_size=0;
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SET @@global.log_bin_trust_function_creators = @old_log_bin_trust_function_creators;
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DROP DATABASE IF EXISTS bug30269;
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FLUSH STATUS;
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CREATE DATABASE bug30269;
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USE bug30269;
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CREATE TABLE test1 (id int, name varchar(23));
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CREATE VIEW view1 AS SELECT * FROM test1;
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INSERT INTO test1 VALUES (5, 'testit');
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GRANT SELECT (id) ON TABLE bug30269.test1 TO 'bug30269'@'localhost';
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GRANT SELECT ON TABLE bug30269.view1 TO 'bug30269'@'localhost';
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set global query_cache_size= 81920;
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USE bug30269;
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show status like 'Qcache_queries_in_cache';
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Variable_name Value
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Qcache_queries_in_cache 0
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# Select statement not stored in query cache because of column privileges.
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SELECT id FROM test1 WHERE id>2;
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id
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5
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show status like 'Qcache_queries_in_cache';
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Variable_name Value
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Qcache_queries_in_cache 0
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SELECT id FROM view1 WHERE id>2;
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id
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5
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show status like 'Qcache_queries_in_cache';
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Variable_name Value
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Qcache_queries_in_cache 1
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USE test;
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DROP DATABASE bug30269;
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DROP USER 'bug30269'@'localhost';
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set GLOBAL query_cache_type=default;
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set GLOBAL query_cache_limit=default;
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set GLOBAL query_cache_min_res_unit=default;
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set GLOBAL query_cache_size=default;
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