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112 lines
4.2 KiB
Text
112 lines
4.2 KiB
Text
# Tests for PERFORMANCE_SCHEMA table io
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# Show the impact of an index
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# Setup
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--source include/not_embedded.inc
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--source include/have_perfschema.inc
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let $engine_type= MyISAM;
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--disable_warnings
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drop table if exists test.no_index_tab;
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drop table if exists test.index_tab;
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--enable_warnings
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let $table_io_select= select SUM(NUMBER_OF_BYTES)
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from performance_schema.events_waits_history_long
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where event_name like 'wait/io/table/%'
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and object_schema = 'test'
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and object_name = ;
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--source ../include/table_io_setup_helper.inc
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# Code to test
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eval create table test.no_index_tab
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( a int, b char(30) default 'Default') engine = $engine_type;
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eval create table test.index_tab
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( a int, b char(30) default 'Default', unique key uidx(a)) engine = $engine_type;
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# Make sure the proper engine is used
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show create table test.no_index_tab;
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show create table test.index_tab;
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truncate table performance_schema.events_waits_history_long;
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update performance_schema.setup_consumers set enabled='YES';
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--echo # Printing of 100 inserts per table is suppressed
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--disable_query_log
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let $run= 100;
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while ($run)
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{
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eval insert into test.no_index_tab set a = $run;
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eval insert into test.index_tab set a = $run;
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dec $run;
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}
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--enable_query_log
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update performance_schema.setup_consumers set enabled='NO';
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eval $table_io_select 'no_index_tab';
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# Attention: There is no visible impact of index maintenance on table io
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# because the maintenance is handled by the storage engine themself.
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eval $table_io_select 'index_tab';
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select count(*) from test.no_index_tab;
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select count(*) from test.index_tab;
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# Testing Code
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# For getting avg(a) inspection of
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# - all rows (test.no_index_tab)
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# - all unique index values (test.index_tab, assuming the optimizer decides to
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# process only the unique index)
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# --> No difference between numvber of accesses for no_index_tab and index_tab
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truncate table performance_schema.events_waits_history_long;
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update performance_schema.setup_consumers set enabled='YES';
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select avg(a) from test.no_index_tab;
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update performance_schema.setup_consumers set enabled='NO';
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eval $table_io_select 'no_index_tab';
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truncate table performance_schema.events_waits_history_long;
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update performance_schema.setup_consumers set enabled='YES';
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select avg(a) from test.index_tab;
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update performance_schema.setup_consumers set enabled='NO';
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eval $table_io_select 'index_tab';
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# With where a = 50 inspection of
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# - all rows (test.no_index_tab)
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# - 1 up to maybe a few unique index values (test.index_tab, assuming that the
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# optimizer decides to exploit the unique index)
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# --> index_tab requires much less accesses than no_index_tab
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truncate table performance_schema.events_waits_history_long;
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update performance_schema.setup_consumers set enabled='YES';
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select 1 as my_column from test.no_index_tab where a = 50;
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update performance_schema.setup_consumers set enabled='NO';
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eval $table_io_select 'no_index_tab';
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truncate table performance_schema.events_waits_history_long;
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update performance_schema.setup_consumers set enabled='YES';
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select 1 as my_column from test.index_tab where a = 50;
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update performance_schema.setup_consumers set enabled='NO';
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eval $table_io_select 'index_tab';
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# With where a = 50 inspection of
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# - all rows (test.no_index_tab)
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# - 1 up to maybe a few unique index values (test.index_tab, assuming that the
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# optimizer decides to exploit the unique index)
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# and remove one row for both cases
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# --> index_tab requires much less accesses than no_index_tab
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truncate table performance_schema.events_waits_history_long;
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update performance_schema.setup_consumers set enabled='YES';
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delete from test.no_index_tab where a = 51;
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update performance_schema.setup_consumers set enabled='NO';
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eval $table_io_select 'no_index_tab';
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truncate table performance_schema.events_waits_history_long;
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update performance_schema.setup_consumers set enabled='YES';
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delete from test.index_tab where a = 51;
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update performance_schema.setup_consumers set enabled='NO';
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eval $table_io_select 'index_tab';
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# In case of failures, this will tell if table io are lost.
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show global status like 'performance_schema_%';
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# Cleanup
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drop table test.no_index_tab;
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drop table test.index_tab;
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--source ../include/table_io_cleanup_helper.inc
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