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by brian
clean slate |
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drop table if exists t1, t2;
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create table t1 (
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a int not null auto_increment,
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b char(16) not null,
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primary key (a),
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key (b)
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);
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create table t2(
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a int not null auto_increment,
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b char(16) not null,
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primary key (a),
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key (b)
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);
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insert into t1(b) values
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('test0'),
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('test1'),
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('test2'),
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('test3'),
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('test4'),
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('test5'),
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('test6'),
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('test7');
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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insert into t2(b) select b from t1;
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insert into t1(b) select b from t2;
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select count(*) from t1;
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count(*)
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33448
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select count(*) from t2;
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count(*)
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20672
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flush tables;
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flush status;
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 0
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Key_reads 0
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select count(*) from t1 where b = 'test1';
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count(*)
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4181
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 294
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Key_reads 60
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select count(*) from t1 where b = 'test1';
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count(*)
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4181
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 588
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Key_reads 60
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flush tables;
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flush status;
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select @@preload_buffer_size;
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@@preload_buffer_size
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32768
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load index into cache t1;
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Table Op Msg_type Msg_text
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test.t1 preload_keys status OK
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 774
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Key_reads 774
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select count(*) from t1 where b = 'test1';
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count(*)
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4181
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 1068
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Key_reads 774
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flush tables;
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flush status;
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 0
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Key_reads 0
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set session preload_buffer_size=256*1024;
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select @@preload_buffer_size;
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@@preload_buffer_size
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262144
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load index into cache t1 ignore leaves;
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Table Op Msg_type Msg_text
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test.t1 preload_keys status OK
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 17
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Key_reads 17
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select count(*) from t1 where b = 'test1';
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count(*)
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4181
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 311
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Key_reads 75
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flush tables;
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flush status;
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 0
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Key_reads 0
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set session preload_buffer_size=1*1024;
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select @@preload_buffer_size;
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@@preload_buffer_size
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1024
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load index into cache t1, t2 key (primary,b) ignore leaves;
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Table Op Msg_type Msg_text
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test.t1 preload_keys status OK
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test.t2 preload_keys status OK
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 785
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Key_reads 785
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select count(*) from t1 where b = 'test1';
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count(*)
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4181
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select count(*) from t2 where b = 'test1';
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count(*)
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2584
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 1266
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Key_reads 821
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flush tables;
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flush status;
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 0
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Key_reads 0
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load index into cache t3, t2 key (primary,b) ;
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Table Op Msg_type Msg_text
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test.t3 preload_keys Error Table 'test.t3' doesn't exist
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test.t3 preload_keys error Corrupt
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test.t2 preload_keys status OK
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 478
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Key_reads 478
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flush tables;
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flush status;
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 0
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Key_reads 0
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load index into cache t3 key (b), t2 key (c) ;
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Table Op Msg_type Msg_text
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test.t3 preload_keys Error Table 'test.t3' doesn't exist
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test.t3 preload_keys error Corrupt
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test.t2 preload_keys Error Key 'c' doesn't exist in table 't2'
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test.t2 preload_keys status Operation failed
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show status like "key_read%";
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Variable_name Value
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Key_read_requests 0
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Key_reads 0
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drop table t1, t2;
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