3 signs of low Linux memory

21 March,2017 by Jack Vamvas

Question: I’ve received some monitoring alerts about low memory availability on a Linux server hosting a DB2 LUW installation.

I’d like to be able to check myself. What are some indicators I can report on – giving me more detail on the low memory usage?

Also, what are some of the signals that Linux memory health is good?

 

Answer: Linux offers some commands which will allow you to assess the Linux memory usage. These suggestions are for general usage and it’s important to understand these figures in the context

of the server. A deeper understanding is required to capacity plan and troubleshoot.

When I have a situation of low memory usage some I make some checks to identify if the alerts are valid .

  • Swap memory increases (or moves frequently)  Read more on Linux swap space and DB2
  • Free and buffers/cache = 0 or very close to 0
  • dmesg | grep oom-killer       --display OutOfMemory-killer ,If there no value returned then oom-killer is not running. The oom-killer sacrifices processes to free memory – it’s a last resort scenario

 

One of these 3 indicators or all 3 is a strong argument for some immediate action. It may require some troubleshooting to identify root cause .

Read More

DB2 Instance Memory and dbptnmem (DBA DB2)

 

 

Author: Jack Vamvas(http://www.dba-db2.com)

Share:

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been saved. Comments are moderated and will not appear until approved by the author. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment on 3 signs of low Linux memory

Comments are moderated, and will not appear until the author has approved them.


dba-db2.com | DB2 Performance Tuning | DBA DB2:Everything | FAQ | Contact | Copyright