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unhappy MySQL Problems

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Previous post - Next post | Parent - Children.1 | Posted on 2007/7/18 9:19
phasar  Lance Corporal   Posts: 28
Hi Joe

I'm having a major problem on my site and the Xoops forums aren't any help at all. Can I ask you to help me? I don't know where else to go for assistance. Can you take a look and let me know what you think, or if you can fix it?


I have been having a problem the last few weeks with my site going down. My host says it's a problem with Xoops coding relating to the MySQL database. Here's a quote of their last email.

Thanks Frank



Hi Frank,

The issue is because you are exceeding the maximum number of mysql user connections to the database server. Please see the readings from the server which I took just now :
===============
| 12594 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18311 | | |
| 12606 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18299 | | |
| 12639 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18258 | | |
| 12659 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18209 | | |
| 12680 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18179 | | |
| 12696 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18068 | | |
| 12708 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18027 | | |
| 12709 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18027 | | |
| 12716 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18027 | | |
| 12724 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18026 | | |
| 12736 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 18028 | | |
| 12840 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17828 | | |
| 12856 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17831 | | |
| 12861 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17827 | | |
| 12903 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17788 | | |
| 12934 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17742 | | |
| 12945 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17706 | | |
| 13013 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17589 | | |
| 13081 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17509 | | |
| 13094 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17484 | | |
| 13104 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17426 | | |
| 13196 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 17276 | | |
| 13717 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 16417 | | |
| 13781 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 16275 | | |
| 16449 | franksre_xoop1 | localhost | franksre_xoop1 | Sleep | 11043 | |
============

As you can see, there as about 20 open connections. Every time the database connect code gets executed, the session is being created and is being left behind. You need to check your code to make sure that all database sessions are closed and / or disable persistent connections.

We had to tweak the server configuration as a result of too may connections being left open on the server creating load and memory issues and thereby affecting the server performance as a whole. Hence we cannot let uses open infinite connections any more. It is true that persistent connections eliminate the overheads during creation of new connections. But, mysql takes relatively short time for creating new connections and often the benefit of using persistent connections is not noticeable. Also, considering the drawbacks of using persistent connections its advantages are negligible. It usually comes to use over slow internet connections and when using quick queries.

You can find more information about this at:
http://www.mysql.com/news-and-events/newsletter/2002-11/a0000000086.html

I have refreshed the sql server connections for now.

Thank you.
---
Tina Garrison
Technical Support Team
TotalChoice Hosting

Ticket Details
===================
Ticket ID: VZW-359694
Department: Technical Support
Priority: --
Status: Closed
Votes:3 Average:3.33

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