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