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    分析统计MySQL general日志 找出查询次数最多的SQL

    作者:admin来源:网络浏览:时间:2020-09-30 00:07:50我要评论
    导读: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...
    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

     

    1. mysql> show  variables like '%general%';

    +------------------+-------------------------------------+
    | Variable_name | Value |
    +------------------+-------------------------------------+
    | general_log | OFF |
    | general_log_file | /usr/local/mysql/data/localhost.log |
    +------------------+-------------------------------------+

    1. mysql> set global general_log = "ON";

     

    analysis-general-log.py脚本

     

    1. #!/usr/bin/python
    2.  
    3. # sort and count mysql general log
    4. # Author: Jason
    5. # Url: www.centos.bz
    6. # Email: admin#centos.bz
    7. # Created: UTC 2015-02-15 17:51:53
    8.  
    9. import re
    10. import sys
    11. import os
    12.  
    13. if len(sys.argv) == 2:
    14.     logPath = sys.argv[1]
    15.     if not os.path.exists(logPath):
    16.         print ("file " + logPath + " does not exists.")
    17.         sys.exit(1)
    18. else:
    19.     print ("Usage: " + sys.argv[0] + " logPath")
    20.     sys.exit(1)
    21.  
    22. logFo = open(logPath)
    23. match = 0
    24.  
    25. for line in logFo:
    26.     line = re.sub(r"\n","",line)
    27.     if match == 0:
    28.         # match line begin with numbers
    29.         lineMatch = re.match(r"\s+[0-9]+\s+.*",line,flags=re.I)
    30.         if lineMatch:
    31.             lineTmp = lineMatch.group(0)
    32.             match = match + 1
    33.             continue
    34.  
    35.     elif match == 1:
    36.         # match line begin with numbers
    37.         lineMatch = re.match(r"\s+[0-9]+\s+.*",line,flags=re.I)
    38.         if lineMatch:
    39.             # match only query
    40.             lineMatchQuery = re.match(r".*Query\s+(.*)",lineTmp,flags=re.I)
    41.             if lineMatchQuery:
    42.                 lineTmp = lineMatchQuery.group(1)
    43.                 # remove extra space
    44.                 lineTmp = re.sub(r"\s+", " ",lineTmp)
    45.                 # replace values (value) to values (x)
    46.                 lineTmp = re.sub(r"values\s*\(.*?\)", "values (x)",lineTmp,flags=re.I)
    47.                 # replace filed = 'value' to filed = 'x'
    48.                 lineTmp = re.sub(r"(=|>|<|>=|<=)\s*('|\").*?\2","\\1 'x'",lineTmp)
    49.                 # replace filed = value to filed = x
    50.                 lineTmp = re.sub(r"(=|>|<|>=|<=)\s*[0-9]+","\\1 x",lineTmp)
    51.                 # replace like 'value' to like 'x'
    52.                 lineTmp = re.sub(r"like\s+('|\").*?\1","like 'x'",lineTmp,flags=re.I)
    53.                 # replace in (value) to in (x)
    54.                 lineTmp = re.sub(r"in\s+\(.*?\)","in (x)",lineTmp,flags=re.I)
    55.                 # replace limit x,y to limit
    56.                 lineTmp = re.sub(r"limit.*","limit",lineTmp,flags=re.I)
    57.                 
    58.                 print (lineTmp)
    59.  
    60.             match = 1
    61.             lineTmp = lineMatch.group(0)
    62.         else:   
    63.             lineTmp += line
    64.             match = 1
    65.  
    66. logFo.close()

    使用方法:

    1. analysis-general-log.py general.log | sort | uniq -c | sort -nr


    1032 SELECT * FROM wp_comments WHERE ( comment_approved = 'x' OR comment_approved = 'x' ) AND comment_post_ID = x ORDER BY comment_date_gmt DESC
    653 SELECT post_id, meta_key, meta_value FROM wp_postmeta WHERE post_id in (x) ORDER BY meta_id ASC
    527 SELECT FOUND_ROWS()
    438 SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy = 'x' AND t.term_id = x limit
    341 SELECT option_value FROM wp_options WHERE option_name = 'x' limit
    329 SELECT t.*, tt.*, tr.object_id FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy in (x) AND tr.object_id in (x) ORDER BY t.name ASC
    311 SELECT wp_posts.* FROM wp_posts WHERE 1= x AND wp_posts.ID in (x) AND wp_posts.post_type = 'x' AND ((wp_posts.post_status = 'x')) ORDER BY wp_posts.post_date DESC
    219 SELECT wp_posts.* FROM wp_posts WHERE ID in (x)
    218 SELECT tr.object_id FROM wp_term_relationships AS tr INNER JOIN wp_term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy in (x) AND tt.term_id in (x) ORDER BY tr.object_id ASC
    217 SELECT wp_posts.* FROM wp_posts WHERE 1= x AND wp_posts.ID in (x) AND wp_posts.post_type = 'x' AND ((wp_posts.post_status = 'x')) ORDER BY wp_posts.menu_order ASC
    202 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') ORDER BY wp_posts.post_date DESC limit
    118 SET NAMES utf8
    115 SET SESSION sql_mode= 'x'
    115 SELECT @@SESSION.sql_mode
    112 SELECT option_name, option_value FROM wp_options WHERE autoload = 'x'
    111 SELECT user_id, meta_key, meta_value FROM wp_usermeta WHERE user_id in (x) ORDER BY umeta_id ASC
    108 SELECT YEAR(min(post_date_gmt)) AS firstdate, YEAR(max(post_date_gmt)) AS lastdate FROM wp_posts WHERE post_status = 'x'
    108 SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy in (x) AND tt.count > x ORDER BY tt.count DESC limit
    107 SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy in (x) AND t.term_id in (x) ORDER BY t.name ASC
    107 SELECT * FROM wp_users WHERE ID = 'x'
    106 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') AND post_date > 'x' ORDER BY wp_posts.post_date DESC limit
    106 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') AND post_date > 'x' ORDER BY RAND() DESC limit
    105 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') AND post_date > 'x' ORDER BY wp_posts.comment_count DESC limit

     

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