分析统计MySQL general日志找出查询次数最多的SQL_mysql教程_开发教程

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

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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分析统计MySQL general日志 找出查询次数最多的SQL

开启general log

analysis-general-log.py脚本

分析统计MySQL general日志找出查询次数最多的SQL