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Search Search. MySQL Performance. Preflight Check. Self-managed systems, which have opted out of direct support can take advantage of the techniques discussed here, however, the Liquid Web Heroic Support Team cannot offer direct aid on these server types.
SSH connections and basic navigation of the standard Linux command line shell environment. Opening, Editing and Saving files in Vim or a chosen system editor. What is a bottleneck? Queries stack up and never completing in the MySQL process table. Applications or websites using the database become sluggish. Connection timeouts errors, especially during peak hours. Identifying Performance Issues. Method 1. Pro : Used on the shell interface, this makes piping output to other scripts and tools easy.
Pro : Using the full modifier allows for seeing the full query on longer queries. Using The slow query log. View Table. There is a large disk space concern with the slow query log file, which needs to be attended to continually until the slow query log feature is disabled.
There is a performance hit taken by enabling the slow query log feature. Because of this, it is considered best practice on production systems to disable the slow query log. The slow query log should only remain enabled for a specific duration when actively looking for troublesome queries that may be impacting the application or website. How Can We Assist? Use this option preferably when you quickly want to check on running queries without having to set up a listener or anything else.
It can be run from any environment you like, whenever you like, without any code changes or overheads. It may require some MySQL permissions configuration, but for me it just runs without any special setup. The only catch is that you often miss queries which execute very quickly, so it is most useful for longer-running queries or when the MySQL server has queries which are backing up - in my experience this is exactly the time when I want to view "live" queries.
On Linux you can use strace , for example:. Since there are lot of escaped characters, you may format strace's output by piping just add between these two one-liners above into the following command:. Obviously this won't replace the standard way of enabling logs, which is described below which involves reloading the SQL server. I'm in a particular situation where I do not have permissions to turn logging on, and wouldn't have permissions to see the logs if they were turned on. I could not add a trigger, but I did have permissions to call show processlist.
So, I gave it a best effort and came up with this:. Bingo bango. I hope maybe this helps someone. This is the easiest setup on a Linux Ubuntu machine I have come across. Crazy to see all the queries live. Open up a new terminal and run this command to scroll the log file, adjusting the path if necessary. Now run your application.
I've been looking to do the same, and have cobbled together a solution from various posts, plus created a small console app to output the live query text as it's written to the log file. Note saving this file required me to run my text editor as an admin. In addition to previous answers describing how to enable general logging, I had to modify one additional variable in my vanilla MySql 5.
No reconfiguration or restart of the MySQL database server is needed either client or app. If you want to have monitoring and statistics, than there is a good and open-source tool Percona Monitoring and Management. It has also live demo system for test. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 12 years, 8 months ago.
Active 1 month ago. Viewed k times. Improve this question. Jeffrey Bosboom Depending on how bad a problem is, I would highly recommend trying MySql Proxy. It's in 'alpha', but has been around a long time. I've reworded this question to omit any reference to tools. I think this question is perfectly on-topic here, as "are we running the queries we should be? MaasSql mysql proxy is not helpful for php developers while using PDO as the query and values get bound only at the server.
Add a comment. Active Oldest Votes. Improve this answer. Martin Konecny Good answer! Note that MySQL 5. Before that, you'd have to restart MySQL to change these settings. Is there any way to get the parameterized variables written to the log?
Works great except I changed a couple things in the first line as detailed below Capture mysql tcp sessions using tcpdump, both queries and replies.
You can analyze a dump for example using maatkit tools:. I was searching and searching and finally I landed at MONyog for monitoring all the queries at real-time that are executed in the mysql server. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How to capture the queries run on MySQL server? Ask Question. Asked 9 years, 9 months ago. Active 3 years, 1 month ago. Viewed 34k times. Is there a way to output this query to a file and have it run every second or so? Is there a better way to capture all of the queries being run? Improve this question.
ZygD 1 1 gold badge 3 3 silver badges 11 11 bronze badges. What OS are you running? This is extremely easy to do on linux, so I'm guessing windows? Patrick Glad to hear it's easy on linux! Fire away Most queries will run and finish in much less than a second, and never show on your list. Add a couple of lines and you'll get the same query functionality than innotop or pt-kill — theist.
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