我们知道不管是apache,iis及mysql都可以通过日志能判断程序性能与错误定位了,今天我们来介绍利用mysql general log日志找出查询次数最多的SQL句子.
查询最多的sql语句,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 # 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: --phpfensi.com # 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 mysql general log日志清除技巧
mysql general log日志不能直接删除,间接方法.
USE mysql; CREATE TABLE gn2 LIKE general_log; RENAME TABLE general_log TO oldLogs, gn2 TO general_log;。
