innodb_max_dirty_pages_pct_func.test

################# mysql-test\t\innodb_max_dirty_pages_pct_func.test  ##########
#                                                                             #
# Variable Name: innodb_max_dirty_pages_pct                                   #
# Scope: GLOBAL                                                               #
# Access Type: Dynamic                                                        #
# Data Type: Numeric                                                          #
# Default Value: 90                                                           #
# Range: 0-100                                                                #
#                                                                             #
#                                                                             #
# Creation Date: 2008-03-08                                                   #
# Author:  Rizwan                                                             #
#                                                                             #
#Description: Test Cases of Dynamic System Variable innodb_max_dirty_pages_pct#
#             that checks the behavior of this variable                       #
#                                                                             #
# Reference: http://dev.mysql.com/doc/refman/5.1/en/                          #
#  server-system-variables.html                                               #
#                                                                             #
###############################################################################

--source include/have_innodb.inc
--echo '#--------------------FN_DYNVARS_044_02-------------------------#'
###########################################################################
# Check if setting innodb_max_dirty_pages_pct is changed in new connection# 
###########################################################################

SET @old_innodb_max_dirty_pages_pct= @@global.innodb_max_dirty_pages_pct;

SET @@global.innodb_max_dirty_pages_pct = 80;
--echo 'connect (con1,localhost,root,,,,)'
connect (con1,localhost,root,,,,);
--echo 'connection con1'
connection con1;
SELECT @@global.innodb_max_dirty_pages_pct;
SET @@global.innodb_max_dirty_pages_pct = 70;
--echo 'connect (con2,localhost,root,,,,)'
connect (con2,localhost,root,,,,);
--echo 'connection con2'
connection con2;
SELECT @@global.innodb_max_dirty_pages_pct;
disconnect con2;
disconnect con1;

--echo '#--------------------FN_DYNVARS_044_02-------------------------#'
###################################################################
# Begin the functionality Testing of innodb_max_dirty_pages_pct   #
###################################################################

--echo 'connection default'
connection default;

--disable_query_log

--disable_warnings
DROP PROCEDURE IF EXISTS add_records;
DROP PROCEDURE IF EXISTS add_until;
DROP PROCEDURE IF EXISTS check_pct;
DROP FUNCTION IF EXISTS dirty_pct;
DROP TABLE IF EXISTS t1;
--enable_warnings

DELIMITER //;
CREATE PROCEDURE add_records(IN NUM INT)
BEGIN
   START TRANSACTION;
   WHILE (NUM>0) DO
      INSERT INTO t1(b) VALUES('MYSQL');
      SET NUM = NUM - 1;
   END WHILE;
   COMMIT;
END//

CREATE FUNCTION dirty_pct() RETURNS DECIMAL(20,17)
BEGIN
  DECLARE res DECIMAL(20,17);
  DECLARE a1,b1 VARCHAR(256);
  DECLARE a2,b2 VARCHAR(256);
  DECLARE dirty CURSOR FOR SELECT * FROM information_schema.global_status 
                WHERE variable_name LIKE 'Innodb_buffer_pool_pages_dirty'
                     UNION SELECT * FROM information_schema.session_status 
                WHERE variable_name LIKE 'Innodb_buffer_pool_pages_dirty';
  DECLARE total CURSOR FOR SELECT * FROM information_schema.global_status
                WHERE variable_name LIKE 'Innodb_buffer_pool_pages_total'
                     UNION SELECT * FROM information_schema.session_status
                WHERE variable_name LIKE 'Innodb_buffer_pool_pages_total';
 
  OPEN dirty;
  OPEN total;

  FETCH dirty INTO a1, b1;
  FETCH total INTO a2, b2;
  
  SET res = ( CONVERT(b1,DECIMAL)*100)/CONVERT(b2,DECIMAL);

  CLOSE dirty;
  CLOSE total;
  RETURN res;
END//

CREATE PROCEDURE add_until(IN NUM DECIMAL)
BEGIN
   DECLARE pct,last DECIMAL(20,17);

   SET pct = dirty_pct();
   SET last = 0;
   WHILE (pct<NUM and pct<100) DO
      CALL add_records(500);
      SET pct = dirty_pct();
      IF (pct<last) THEN
         SET pct = NUM+1;
      ELSE
         SET last = pct;
      END IF;
   END WHILE;
END//

CREATE PROCEDURE check_pct(IN NUM DECIMAL)
BEGIN
   IF (dirty_pct() < NUM) THEN
      SELECT 'BELOW_MAX' AS PCT_VALUE;
   ELSE
      SELECT 'ABOVE_MAX' AS PCT_VALUE;
   END IF;
END//

DELIMITER ;//

CREATE TABLE t1(
a INT AUTO_INCREMENT PRIMARY KEY,
b CHAR(200)
)ENGINE=INNODB;

--enable_query_log

#==========================================================
--echo '---Check when innodb_max_dirty_pages_pct is 10---'
#==========================================================

SET @@global.innodb_max_dirty_pages_pct = 10;

FLUSH STATUS;

# add rows until dirty pages pct is less than this value
CALL add_until(10);

# give server some time to flush dirty pages
FLUSH TABLES;
CALL add_records(500);
--echo '--sleep 5'
--sleep 5

--echo 'We expect dirty pages pct to be BELOW_MAX'
CALL check_pct(10);

#SHOW STATUS LIKE 'innodb%';

DROP PROCEDURE add_records;
DROP PROCEDURE add_until;
DROP PROCEDURE check_pct;
DROP FUNCTION dirty_pct;
DROP TABLE t1;
SET @@global.innodb_max_dirty_pages_pct = @old_innodb_max_dirty_pages_pct;

##################################################################
# End of functionality Testing for innodb_max_dirty_pages_pct    #
##################################################################