Solved

Cron job for clearing database table?

Posted on 2009-04-08
9
384 Views
Last Modified: 2013-12-26
I need to create a cron job that will clear the cache table in my mySQL db every week. What's the simplest way to do this?
0
Comment
Question by:cwdo
  • 5
  • 4
9 Comments
 
LVL 21

Expert Comment

by:theGhost_k8
ID: 24096769

Add following line to shell file your-file.sh
mysql -uroot -pnitin -e "your query goes here"

shell> crontab -e
 *  *  *  *  1 sh /path/to/your-file.sh
ref: http://en.wikipedia.org/wiki/Cron
0
 
LVL 21

Expert Comment

by:theGhost_k8
ID: 24096791
#############
Damn !!
Calling Zone Expers - please again obfuscate my credentials !!
Thanks in advance
#############

By cache table iIf you mean query cache then query will be "reset query cache".
0
 

Author Comment

by:cwdo
ID: 24097076
If the database name is "db" and the table name is "cache", what would the query be?
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 
LVL 21

Expert Comment

by:theGhost_k8
ID: 24097736
If by cache you mean a table you can truncate it. Your query will be:
truncate table db.cache;
0
 

Author Comment

by:cwdo
ID: 24098508
Thanks for the quick response! It appears to work now except I can't access the db. How would I handle access to the db? Could you give an example of how to access the db via username and password in either an .sh file, or .php file? If you could provide a full example of the above in either an .sh or .php file, including sample username and password commands to access the db that would be greatly appreciated.
0
 
LVL 21

Expert Comment

by:theGhost_k8
ID: 24098564
Your Commad 'd be:
mysql -uUSER -pPWD -hDB-HOSTNAME/IPADDRESS  -e "truncate table db.cache"

The USER should have proper privileges to access the server if you're connecting remotely.
You can give permission using grant command.
http://dev.mysql.com/doc/refman/5.1/en/grant.html
0
 

Author Comment

by:cwdo
ID: 24149748
How exactly do I enter the hostname/IP address, and do I need both? Right now I have
-hdatabasename-localhost and I get the message "unknown MySQL server". Should there be spaces after -u, -p, -h, etc.?
0
 
LVL 21

Accepted Solution

by:
theGhost_k8 earned 500 total points
ID: 24154532
mysql -uUSER -pPWD -hDB-HOSTNAME/IPADDRESS
consider your user name is 'root' and password is 'secret' and mysql-server's ip address is '10.10.10.10':
you will do:

mysql -uroot -psecret -h10.10.10.10  -e "truncate table db.cache"
0
 

Author Closing Comment

by:cwdo
ID: 31568004
Thanks! Also got this to work by linking to a PHP file containing the mySQL commands, incidentally.
0

Featured Post

Simplifying Server Workload Migrations

This use case outlines the migration challenges that organizations face and how the Acronis AnyData Engine supports physical-to-physical (P2P), physical-to-virtual (P2V), virtual to physical (V2P), and cross-virtual (V2V) migration scenarios to address these challenges.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Hi, in this article I'm going to teach you how to run your own site, and how to let people in (without IP). I'll talk about and explain each step... :) By the way, everything in this Tutorial is completely free and legal. This article is for …
If you are a web developer, you would be aware of the <iframe> tag in HTML. The <iframe> stands for inline frame and is used to embed another document within the current HTML document. The embedded document could be even another website.
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

679 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question