Category: High Availability

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Ember’s Take on Monitoring DB2 LUW

I have some very specific perspectives on monitoring DB2. In addition to regular consulting in my day job, we also provide full-service virtual DBA services, including monitoring. The monitoring we choose to do is very much under my control, and I’m constantly working on enhancements. I thought I’d blog on what I like to monitor and alert on without going...

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Troubleshooting with Mickey Mouse, Snow White, and Cinderella

It’s that magical time of year again. DBAs excitedly pack their bags for a week-long trip. On-call rotation is hurriedly passed to the next poor soul on the rotation list. Ember dons her trademark pigtails. Melanie Stopfer crams another 20 slides into and already packed presentation. It’s time for the IDUG North American Technical Conference in Anaheim, California. All your...

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Finding the Subnet Mask on AIX

This is something DB2 DBAs may need to do as a part of setting up TSAMP. Nearly every server I’ve done before has had a subnet mask of 255.255.255.0, but I ran into a server recently that wasn’t, and thought I would share how I figured out what it should be (alone, in the middle of the night, during an...

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DB2 Basics: Patching DB2

Like any software, DB2 requires frequent patching. A database should be one of the most secure parts of any enterprise, and keeping it secure means keeping up with the fixes that are delivered in fix packs. Fix Packs DB2 delivers many things through fixpacks, including: Security Fixes Bug Fixes New Functionality – though IBM goes back and forth on this...

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TSAMP Issue on Fixpack

As always, when I feel pain, I share the knowledge that pain gained me with my blog readers. Man, that was a painful fixpack. I was upgrading an AIX HADR pair from 10.5 fixpack 3 to 10.5 fixpack 5. My experience has generally been that TSA is painful when patching DB2. Problem Description In this case, I was not patching...

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Going Beyond 2 Servers – HADR as a High Availability/Disaster Recovery option.

When the client considers high availability and disaster recovery, they often do not know what they are talking about. Many times the client may be dropping buzzwords like “five nines”. To them this is the definition of disaster recovery. In other cases, they are thinking of a worst-case scenario where a whole data center falls off the face of the...

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Ongoing Support of DB2’s HADR

There are some things to be aware of with ongoing support of a HADR system. I thought I’d group them together to provide a primer of do’s and don’ts for support of HADR. Monitoring HADR HADR does occasionally stop all by itself. Also, system events can cause it to not be active. For these reasons, it is critical that you...

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Automatic Bufferpools in DB2 HADR

In this blog post, I will share what I learned about DB2 automatic bufferpools when using HADR. Problem: In a DB2 10.5 (fp3a) HADR environment, during heightened database activity on the primary database, there was delayed log replay on principal standby database. The HADR_SYNCMODE was set to SYNC. Primary and Standby database servers were in the same data center. HADR_SYNCMODE...