…, I wanted to know more about how MySQL executes this query. So I used commands you’re probably… | end | 0.000008 | | query end | 0.000004 | | closing tables | 0.000032 | | freeing items | 0.000035 | | logging slow query | 0.000004 | | cleaning up …
Post: How to convert MySQL's SHOW PROFILES into a real profile
February 20, 2012 By 12 Comments
… sample database to demonstrate: mysql> SET profiling=1; mysql> pager cat > /dev/null mysql> SELECT * FROM nicer_… | | end | 0.000002 | 0.00 | 1 | 0.0000020000 | | logging slow query | 0.000001 | 0.00 | 1 | 0.0000010000 | +———————-+———-+——-+——-+————–+ Much…
Post: Slow Query Log analyzes tools
September 6, 2006 By 84 Comments
… Slow Query Log – Especially after the changes to log all queries slow query log may be growing too rapidly to follow, so we implemented slow query log filter (based on parse_mysql_slow_log… passes across same slow query log first to fix worse queries and then come to find more optimization candidates. So “tail -f mysql-slow.log | mysql_slow_log_filter -T…
Post: Analyzing Slow Query Table in MySQL 5.6
February 18, 2013 By 1 Comment
… the query time and lock time as floating-point numerics to microsecond scale: sql/log.cc, MYSQL_QUERY_LOG::write(): 1945 /* For slow query log */ 1946 sprintf(query_time_buff, “%.6f”, ulonglong2double(query_utime)/1000000.0); 1947 sprintf…
Post: MySQL Slow query log in the table
May 31, 2007 By 1 Comment
As of MySQL 5.1 get MySQL slow query log logged in mysql.slow_log table instead of the file as you had in previous … order query come in the log file. If you used to do tail -100 log-slow.log and now change it to SELECT * FROM slow_log ORDER BY start_time DESC LIMIT 100 you would find new queries coming…
Post: Identifying the load with the help of pt-query-digest and Percona Server
December 29, 2011 By 3 Comments
… MySQL server, you would see an entry like this in the slow query log: # Time: 111229 3:02:26 # User@Host: msandbox[msandbox] @ localhost [] # Query…. Using pt-query-digest Using pt-query-digest is pretty straight forward: pt-query-digest /path/to/slow-query.log Note that executing pt-query-digest can…
Post: Does Slow query log logs all slow queries ?
June 25, 2007 By 3 Comments
… MySQL Slow query log to log all slow queries to catch problematic queries or for audit purposes. In fact however not all the queries are logged. I already mentioned mysql slave queries are not logged to slow query log and…
Post: Logging MySQL queries from the client instead of the server
February 2, 2011 By 2 Comments
The “slow query log” is the single most valuable way to examine query execution on your MySQL server. Queries are logged with timing information, and in the… application time the queries and write a query log. I suggest writing out something in a standard logging format such as the slow-query-log format, so…
Post: Poor man's query logging
November 7, 2008 By 5 Comments
… by MySQL to a file with limited amount of additional information. The other is slow log enabled by –log-slow-queries parameter (MySQL 5.1 requires also –slow-query-log), which was designed to store poorly performing queries that run at…
Post: Hidden columns of query_review_history table
August 28, 2012 By Leave a Comment
You can use pt-query-digest to process a MySQL slow query log and store historical values for review trend analysis into query_review_history table…}=\”$HOSTNAME\”" mysqld-slow-queries.log $HOSTNAME will reflect the current machine hostname. Replace $HOSTNAME with the necessary hostname if you copied slow query log from the…
