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6a834d1f4f
The problem is that the query cache was storing partial results if the statement failed when sending the results to the client. This could cause clients to hang when trying to read the results from the cache as they would, for example, wait indefinitely for a eof packet that wasn't saved. The solution is to always discard the caching of a query that failed to send its results to the associated client.
363 lines
5.8 KiB
Text
363 lines
5.8 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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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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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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DROP TABLE IF EXISTS t1;
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FLUSH STATUS;
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SET GLOBAL query_cache_size=1048576;
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CREATE TABLE t1 (a INT);
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INSERT INTO t1 VALUES (1),(2),(3),(4),(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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LOCK TABLES t1 WRITE;
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SELECT * FROM t1;
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UNLOCK TABLES;
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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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DROP TABLE t1;
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SET GLOBAL query_cache_size= default;
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