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214 lines
4.5 KiB
Text
214 lines
4.5 KiB
Text
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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 217
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Key_reads 45
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Key_write_requests 0
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Key_writes 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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 434
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Key_reads 45
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Key_write_requests 0
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Key_writes 0
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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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preload t1 keys;
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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 "preload_%";
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Variable_name Value
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show status like "key_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 217
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Key_reads 45
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Key_write_requests 0
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Key_writes 0
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flush tables;
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flush status;
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show status like "key_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 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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preload t1 keys 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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 217
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Key_reads 45
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Key_write_requests 0
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Key_writes 0
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flush tables;
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flush status;
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show status like "key_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 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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preload t1 keys, t2 keys (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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 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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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_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 351
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Key_reads 73
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Key_write_requests 0
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Key_writes 0
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flush tables;
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flush status;
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show status like "key_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 0
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preload t3 keys, t2 keys (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.t2 preload_keys status OK
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show status like "key_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 0
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flush tables;
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flush status;
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show status like "key_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 0
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preload t3 keys (b), t2 keys (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.t2 preload_keys error Key column 'c' doesn't exist in table
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test.t2 preload_keys status Operation failed
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show status like "key_%";
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Variable_name Value
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Key_blocks_used 918
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Key_read_requests 0
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Key_reads 0
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Key_write_requests 0
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Key_writes 0
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drop table t1, t2;
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