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Current File : /www/server/mysql/mysql-test/suite/perfschema/t/thread_cache.test
# Tests for PERFORMANCE_SCHEMA

--source include/not_embedded.inc
--source include/have_perfschema.inc

# Setup

flush status;

SET @saved_thread_cache_size = @@global.thread_cache_size;

set global thread_cache_size = 0;

show variables like "thread_cache_size";

connect (con1, localhost, root, , );

let $con1_ID=`select connection_id()`;

let $con1_THREAD_ID=`select thread_id from performance_schema.threads
  where PROCESSLIST_ID = connection_id()`;

connect (con2, localhost, root, , );

let $con2_ID=`select connection_id()`;

let $con2_THREAD_ID=`select thread_id from performance_schema.threads
  where PROCESSLIST_ID = connection_id()`;

--connection default

--disable_query_log
eval select ($con2_ID - $con1_ID) into @id_increment;
eval select ($con2_THREAD_ID - $con1_THREAD_ID) into @thread_id_increment;
--enable_query_log

# Expect 1, connection_id() is incremented for each new connection
select @id_increment;
# Expect 1, THREAD_ID is incremented for each new connection
select @thread_id_increment;

--disconnect con2

--connection default

# Wait for the disconnect con2 to complete
let $wait_condition=
  select count(*) = 2 from performance_schema.threads
  where name like "thread/sql/one_connection";
--source include/wait_condition.inc

connect (con3, localhost, root, , );

let $con3_ID=`select connection_id()`;

let $con3_THREAD_ID=`select thread_id from performance_schema.threads
  where PROCESSLIST_ID = connection_id()`;

--disconnect con3
--disconnect con1

--connection default

# Wait for the disconnect con1 and con3 to complete
let $wait_condition=
  select count(*) = 1 from performance_schema.threads
  where name like "thread/sql/one_connection";
--source include/wait_condition.inc

--disable_query_log
eval select ($con3_ID - $con2_ID) into @id_increment;
eval select ($con3_THREAD_ID - $con2_THREAD_ID) into @thread_id_increment;
--enable_query_log

select @id_increment;
select @thread_id_increment;

set global thread_cache_size = 100;

show variables like "thread_cache_size";

connect (con1, localhost, root, , );

let $con1_ID=`select connection_id()`;

let $con1_THREAD_ID=`select thread_id from performance_schema.threads
  where PROCESSLIST_ID = connection_id()`;

connect (con2, localhost, root, , );

let $con2_ID=`select connection_id()`;

let $con2_THREAD_ID=`select thread_id from performance_schema.threads
  where PROCESSLIST_ID = connection_id()`;

--connection default

--disable_query_log
eval select ($con2_ID - $con1_ID) into @id_increment;
eval select ($con2_THREAD_ID - $con1_THREAD_ID) into @thread_id_increment;
--enable_query_log

select @id_increment;
select @thread_id_increment;

--disconnect con2

--connection default

# Wait for the disconnect con2 to complete
let $wait_condition=
  select count(*) = 2 from performance_schema.threads
  where name like "thread/sql/one_connection";
--source include/wait_condition.inc

connect (con3, localhost, root, , );

let $con3_ID=`select connection_id()`;

let $con3_THREAD_ID=`select thread_id from performance_schema.threads
  where PROCESSLIST_ID = connection_id()`;

--disconnect con3
--disconnect con1

--connection default

# Wait for the disconnect con1 and con3 to complete
let $wait_condition=
  select count(*) = 1 from performance_schema.threads
  where name like "thread/sql/one_connection";
--source include/wait_condition.inc

--disable_query_log
eval select ($con3_ID - $con2_ID) into @id_increment;
eval select ($con3_THREAD_ID - $con2_THREAD_ID) into @thread_id_increment;
--enable_query_log

# When caching threads, the pthread that executed con2 was parked in the
# cache on disconnect, and then picked up con3.

# Still expect a new connection_id()
select @id_increment;

# And expect a new instrumentation: the THREAD_ID of old connections should not be reused.
select @thread_id_increment;

set global thread_cache_size = @saved_thread_cache_size;

show status like "performance_schema_thread%";

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