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67 lines
2.4 KiB
Text
67 lines
2.4 KiB
Text
create table t1 (
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a varchar(255),
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b varchar(255),
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c varchar(255),
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d varchar(255),
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primary key(a,b,c,d)
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) engine=innodb character set latin1;
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SET unique_checks=0, foreign_key_checks= 0;
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begin;
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insert into t1 select
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repeat(uuid(), 7),
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repeat(uuid(), 7),
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repeat(uuid(), 7),
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repeat(uuid(), 7)
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from seq_1_to_16384;
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insert into t1 values ('z','z','z','z');
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commit;
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# Restart the server to make sure we have an empty InnoDB Buffer Pool
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# (in the test's .opt file we've disabled buffer pool saving/loading
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# and also tried to disable any background activity)
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SET GLOBAL innodb_fast_shutdown=0;
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# restart
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set @innodb_pages_read0=
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(select variable_value
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from information_schema.session_status
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where variable_name like 'innodb_pages_read');
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set @js='$analyze_output';
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set @js=json_extract(@js, '$.query_block.nested_loop[0].table.r_engine_stats');
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set @pages_accessed= cast(json_value(@js,'$.pages_accessed') as INT);
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set @pages_read_count= cast(json_value(@js,'$.pages_read_count') as INT);
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set @pages_prefetch_read_count= cast(json_value(@js,'$.pages_prefetch_read_count') as INT);
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select @pages_accessed > 1000 and @pages_accessed < 1500;
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@pages_accessed > 1000 and @pages_accessed < 1500
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1
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set @total_read = (@pages_read_count + @pages_prefetch_read_count);
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set @low_ok= @pages_accessed*0.75 < @total_read;
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set @high_ok= @total_read < @pages_accessed*1.50;
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select @low_ok, @high_ok;
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@low_ok @high_ok
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1 1
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select
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if(@low_ok and @high_ok,0,@pages_accessed) unexpected_accessed,
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if(@low_ok and @high_ok,0,@total_read) unexpected_read;
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unexpected_accessed unexpected_read
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0 0
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set @innodb_pages_read1=
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(select variable_value
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from information_schema.session_status
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where variable_name like 'innodb_pages_read');
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set @innodb_pages_read_incr= (@innodb_pages_read1 - @innodb_pages_read0);
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select @innodb_pages_read_incr > 1000, @innodb_pages_read_incr < 1500;
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@innodb_pages_read_incr > 1000 @innodb_pages_read_incr < 1500
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1 1
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set @js='$analyze_output';
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set @js=json_extract(@js, '$.query_block.nested_loop[0].table.r_engine_stats');
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# This must just print pages_accessed. No page reads or prefetch reads,
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# because the previous query has read all the needed pages into the
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# buffer pool, which is set to be large enough to accomodate the whole
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# table.
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select @js;
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@js
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{"pages_accessed": NUMBER}
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set @pages_accessed2= cast(json_value(@js,'$.pages_accessed') as INT);
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select @pages_accessed2 = @pages_accessed;
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@pages_accessed2 = @pages_accessed
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1
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drop table t1;
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