Heim >Datenbank >MySQL-Tutorial >MySQL两种表存储结构性能比较测试过程_MySQL

MySQL两种表存储结构性能比较测试过程_MySQL

WBOY
WBOYOriginal
2016-06-01 14:11:49852Durchsuche

  MySQL支持的两种主要表存储格式MyISAM,InnoDB,上个月做个项目时,先使用了InnoDB,结果速度特别慢,1秒钟只能插入10几条。后来换成MyISAM格式,一秒钟插入上万条。当时觉的这两个表的性能也差别太大了吧。后来自己推测,不应该差别这么慢,估计是写的插入语句有问题,决定做个测试:
  
  测试环境:Redhat Linux9,4CPU,内存2G,MySQL版本为4.1.6-gamma-standard
  
  测试程序:Python+Python-MySQL模块。
  
  测试方案:
  
  1、MyISAM格式分别测试,事务和不用事务两种情况:
  
  2、InnoDB格式分别测试AutoCommit=1(不用begin transaction和用begin transaction模式),
  
  AutoCommit=0 (不用begin transaction和用begin transaction模式)四种情况。
  
  测试方法为插入10000条记录。为了测试不互相影响,单独建立了专用的测试表,建表语句如下:
  
  1、MyISAM不用事务表:
  
  CREATE TABLE `MyISAM_NT` (
  
  `TableId` int(11) NOT NULL default '0',
  
  `TableString` varchar(21) NOT NULL default ''
  
  ) ENGINE=MyISAM;
  
  2、MyISAM用事务表:
  
  CREATE TABLE `MyISAM_TS` (
  
  `TableId` int(11) NOT NULL default '0',
  
  `TableString` varchar(21) NOT NULL default ''
  
  ) ENGINE=MyISAM;
  
  3、InnoDB关闭AutoCommit,不用事务:
  
  CREATE TABLE `INNODB_NA_NB` (
  
  `TableId` int(11) NOT NULL default '0',
  
  `TableString` varchar(21) NOT NULL default ''
  
  ) ENGINE=InnoDB;
  
  4、InnoDB关闭AutoCommit,用事务:
  
  CREATE TABLE `INNODB_NA_BE` (
  
  `TableId` int(11) NOT NULL default '0',
  
  `TableString` varchar(21) NOT NULL default ''
  
  ) ENGINE=InnoDB;
  
  5、InnoDB开启AutoCommit,不用事务:
  
  CREATE TABLE `INNODB_AU_NB` (
  
  `TableId` int(11) NOT NULL default '0',
  
  `TableString` varchar(21) NOT NULL default ''
  
  ) ENGINE=InnoDB;
  
  6、InnoDB开启AutoCommit,用事务:
  
  CREATE TABLE `INNODB_AU_BE` (
  
  `TableId` int(11) NOT NULL default '0',
  
  `TableString` varchar(21) NOT NULL default ''
  
  ) ENGINE=InnoDB;
  
  测试的Python脚本如下:
  
  #!/usr/bin/env Python
  
  '''
  
  MyISAM,InnoDB性能比较
  
  作者:空心菜(Invalid)
  
  时间:2004-10-22
  
  '''
  
  import MySQLdb
  
  import sys
  
  import os
  
  import string
  
  import time
  
  c = None
  
  testtables = [("MyISAM_NT",None,0),
  
  ("MyISAM_TS",None,1),
  
  ("INNODB_NA_NB",0,0),
  
  ("INNODB_NA_BE",0,1),
  
  ("INNODB_AU_NB",1,0),
  
  ("INNODB_AU_BE",1,1)
  
  ]
  
  def BeginTrans():
  
  print "ExecSQL:BEGIN;"
  
  c.execute("BEGIN;")
  
  return
  
  def Commit():
  
  print "ExecSQL:COMMIT;"
  
  c.execute("COMMIT;")
  
  return
  
  def AutoCommit(flag):
  
  print "ExecSQL:Set AUTOCOMMIT = "+str(flag)
  
  c.execute("Set AUTOCOMMIT = "+str(flag))
  
  return
  
  def getcount(table):
  
  #print "ExecSQL:select count(*) from "+table
  
  c.execute("select count(*) from "+table)
  
  return c.fetchall()[0][0]
  
  def AddTable (Table,TableId,TableString):
  
  sql = "INSERT INTO "+Table+"(TableId, TableString) VALUES( "+ TableId+ ",'" + TableString +"')"
  
  try:
  
  c.execute(sql)
  
  except MySQLdb.OperationalError,error:
  
  print "AddTable Error:",error
  
  return -1;
  
  return c.rowcount
  
  def main():
  
  argv = sys.argv
  
  if len(argv)   
  print 'Usage:',argv[0],' TableId TestCount \n'
  
  sys.exit(1)
  
  global c #mysql访问cursor
  
  db_host = "localhost"
  
  db_name = "demo"
  
  db_user = "root"
  
  db_user_passwd = ""
  
  print "Config:[%s %s/%s %s] DB\n"%(db_host,db_user,db_user_passwd,db_name)
  
  if len(argv) > 2:
  
  tableid = argv[1]
  
  testcount = int(argv[2]) #
  
  for test in testtables:
  
  #每次操作前都重写建立数据库连接
  
  try:
  
  mdb = MySQLdb.connect(db_host, db_user, db_user_passwd, db_name)
  
  except MySQLDb.OperationalError,error:
  
  print "Connect Mysql[%s %s/%s %s] DB Error:"%(db_host,db_user,db_user_passwd,db_name),error,"\n"
  
  sys.exit(1)
  
  else:
  
  c = mdb.cursor()
  
  table,autocommit,trans = test
  
  starttime = time.time()
  
  print table," ",time.strftime("%y-%m-%d %H:%M:%S",time.localtime())
  
  if autocommit != None:
  
  AutoCommit(autocommit)
  
  if trans == 1:
  
  BeginTrans()
  
  for i in xrange(testcount):
  
  tablestring = "%020d"%i
  
  if (AddTable(table,tableid,tablestring)  
  print "AddTable Error",tablestring
  
  if trans == 1:
  
  Commit()
  
  print time.strftime("%y-%m-%d %H:%M:%S",time.localtime())
  
  endtime = time.time()
  
  usedtime = endtime-starttime
  
  print table,"count:",getcount(table)," used time:",usedtime
  
  c.close()
  
  mdb.close()
  
  if __name__ == '__main__':
  
  main()
  
  测试结果如下:
  
  Config:[localhost root/ demo] DB
  
  MyISAM_NT 04-10-22 16:33:24
  
  04-10-22 16:33:26
  
  MyISAM_NT count: 10000 used time: 2.1132440567
  
  MyISAM_TS 04-10-22 16:33:26
  
  ExecSQL:BEGIN;
  
  ExecSQL:COMMIT;
  
  04-10-22 16:33:29
  
  MyISAM_TS count: 10000 used time: 2.65475201607
  
  INNODB_NA_NB 04-10-22 16:33:29
  
  ExecSQL:Set AUTOCOMMIT = 0
  
  04-10-22 16:33:31
  
  INNODB_NA_NB count: 10000 used time: 2.51947999001
  
  INNODB_NA_BE 04-10-22 16:33:31
  
  ExecSQL:Set AUTOCOMMIT = 0
  
  ExecSQL:BEGIN;
  
  ExecSQL:COMMIT;
  
  04-10-22 16:33:35
  
  INNODB_NA_BE count: 10000 used time: 3.85625100136
  
  INNODB_AU_NB 04-10-22 16:33:35
  
  ExecSQL:Set AUTOCOMMIT = 1
  
  04-10-22 16:34:19
  
  INNODB_AU_NB count: 10000 used time: 43.7153041363
  
  INNODB_AU_BE 04-10-22 16:34:19
  
  ExecSQL:Set AUTOCOMMIT = 1
  
  ExecSQL:BEGIN;
  
  ExecSQL:COMMIT;
  
  04-10-22 16:34:22
  
  INNODB_AU_BE count: 10000 used time: 3.14328193665
  
  结论:
  
  由此得知影响速度的主要原因是AUTOCOMMIT默认设置是打开的,我当时的程序没有显式调用BEGIN;开始事务,导致每插入一条都自动Commit,严重影响了速度。
Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn