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mysql查询日志计数统计

2024-07-24 12:36:15
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  分析统计MySQL general日志 找出查询次数最多的SQL
  当我们需要优化MySQL查询时,第一想到的是开启慢日志,慢日志可以看到执行消耗超过一定时间的SQL语句和未使用索引的SQL。但如果我们想分析所有SQL查询的分布,即哪类SQL查询次数最多的时候,我们可以开启general log来统计。
 
  开启general log
  mysql> show  variables like '%general%';
  +——————+————————————-+
  | Variable_name | Value |
  +——————+————————————-+
  | general_log | OFF |
  | general_log_file | /usr/local/mysql/data/localhost.log |
  +——————+————————————-+
 
  mysql> set global general_log = "ON";
  analysis-general-log.py脚本
  #!/usr/bin/python
  
  # sort and count mysql general log
  # Author: Jason
  # Url: www.centos.bz
  # Email: admin#centos.bz
  # Created: UTC 2015-02-15 17:51:53
  
  import re
  import sys
  import os
  
  if len(sys.argv) == 2:
      logPath = sys.argv[1]
      if not os.path.exists(logPath):
          print ("file " + logPath + " does not exists.")
          sys.exit(1)
  else:
      print ("Usage: " + sys.argv[0] + " logPath")
      sys.exit(1)
  
  logFo = open(logPath)
  match = 0
  
  for line in logFo:
      line = re.sub(r"/n","",line)
      if match == 0:
          # match line begin with numbers
          lineMatch = re.match(r"/s+[0-9]+/s+.*",line,flags=re.I)
          if lineMatch:
              lineTmp = lineMatch.group(0)
              match = match + 1
              continue
  
      elif match == 1:
          # match line begin with numbers
          lineMatch = re.match(r"/s+[0-9]+/s+.*",line,flags=re.I)
          if lineMatch:
              # match only query
              lineMatchQuery = re.match(r".*Query/s+(.*)",lineTmp,flags=re.I)
              if lineMatchQuery:
                  lineTmp = lineMatchQuery.group(1)
                  # remove extra space
                  lineTmp = re.sub(r"/s+", " ",lineTmp)
                  # replace values (value) to values (x)
                  lineTmp = re.sub(r"values/s*/(.*?/)", "values (x)",lineTmp,flags=re.I)
                  # replace filed = 'value' to filed = 'x'
                  lineTmp = re.sub(r"(=|>|<|>=|<=)/s*('|/").*?/2","//1 'x'",lineTmp)
                  # replace filed = value to filed = x
                  lineTmp = re.sub(r"(=|>|<|>=|<=)/s*[0-9]+","//1 x",lineTmp)
                  # replace like 'value' to like 'x'
                  lineTmp = re.sub(r"like/s+('|/").*?/1","like 'x'",lineTmp,flags=re.I)
                  # replace in (value) to in (x)
                  lineTmp = re.sub(r"in/s+/(.*?/)","in (x)",lineTmp,flags=re.I)
                  # replace limit x,y to limit
                  lineTmp = re.sub(r"limit.*","limit",lineTmp,flags=re.I)
                  
                  print (lineTmp)
  
              match = 1
              lineTmp = lineMatch.group(0)
          else:    
              lineTmp += line
              match = 1
  
  logFo.close()
  使用方法:
 
  analysis-general-log.py general.log | sort | uniq -c | sort -nr
  该python脚本使用与python2.7以上环境.

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