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# # Bug#12427262 : 60961: SHOW TABLES VERY SLOW WHEN NOT IN SYSTEM DISK CACHE. # create database show_table_lw_db; use show_table_lw_db; create table t1 (c1 int); create table t2 (c1 int); create table t3 (c1 int); create table t4 (c1 int); create table t5 (c1 int); create table t6 (c1 int); create table t7 (c1 int); create table t8 (c1 int); create table t9 (c1 int); create table t10 (c1 int); select Sum(ALL(COUNT_READ)) from performance_schema.file_summary_by_instance where FILE_NAME like "%show_table_lw_db%" AND FILE_NAME like "%.frm%" AND EVENT_NAME='wait/io/file/sql/FRM' into @count_read_before; Warnings: Warning 1287 '<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead show tables; Tables_in_show_table_lw_db t1 t10 t2 t3 t4 t5 t6 t7 t8 t9 select Sum(ALL(COUNT_READ)) from performance_schema.file_summary_by_instance where FILE_NAME like "%show_table_lw_db%" AND FILE_NAME like "%.frm%" AND EVENT_NAME='wait/io/file/sql/FRM' into @count_read_after; Warnings: Warning 1287 '<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead select @count_read_after-@count_read_before; @count_read_after-@count_read_before 0.00000000000000000000000000000000000000 show full tables; Tables_in_show_table_lw_db Table_type t1 BASE TABLE t10 BASE TABLE t2 BASE TABLE t3 BASE TABLE t4 BASE TABLE t5 BASE TABLE t6 BASE TABLE t7 BASE TABLE t8 BASE TABLE t9 BASE TABLE select Sum(ALL(COUNT_READ)) from performance_schema.file_summary_by_instance where FILE_NAME like "%show_table_lw_db%" AND FILE_NAME like "%.frm%" AND EVENT_NAME='wait/io/file/sql/FRM' into @count_read_after; Warnings: Warning 1287 '<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead select @count_read_after-@count_read_before; @count_read_after-@count_read_before 10.00000000000000000000000000000000000000 drop table t1; drop database show_table_lw_db;