Top 10 DB2 Support Nightmares #9
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What do you do when disaster strikes? In part 9 of our DB2 Support Nightmare series we look at another DB2 disaster scenario and how it was resolved by the experts at Triton Consulting.
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This document provides an overview of the DB2DART tool and examples of how it can be used to analyze and repair issues with DB2 databases and tables. Key points include:
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Top 10 DB2 Support Nightmares #1
A junior DBA accidentally deleted all rows from a critical table in a pre-production environment. The DBA had connected to the wrong system and used the instance owner userid. The system administrator had enabled the FED_NOAUTH parameter, which bypasses authentication at the instance level. This meant any user could connect as any other user without the correct password and impact the database. The moral is that unintended consequences can occur from small configuration changes and it is important to get skilled DB2 support.
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The document discusses DB2 10 for z/OS and its new temporal data support feature. It provides an overview of DB2 10, describing new features such as temporal data, virtual storage enhancements, and optimizer enhancements. It then discusses temporal data concepts in more detail, including temporal tables, periods, business temporal tables and system temporal tables. The document provides examples and explains how to implement temporal tables in DB2 10. It concludes by listing further reading materials on DB2 10.
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DB2 10 for z/OS is a new version of IBM's database software that provides significant performance improvements, new security and temporal data features, and easier migration paths from prior versions. Key enhancements in DB2 10 include 5-20% CPU reductions, up to 10x more threads per subsystem due to virtual storage improvements, row and column access controls, and built-in support for tracking historical data. Customers running DB2 8 or 9 can upgrade directly to DB2 10 using new "skip migration" functionality, or upgrade sequentially from earlier versions. Migrating to DB2 10 requires meeting prerequisites and following steps to move to conversion mode and then normal mode.
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UKCMG DB2 pureScale
The document discusses IBM's pureScale technology which allows DB2 databases to scale up to 128 nodes for high availability and scalability. PureScale forms a shared-disk cluster and uses proven "data sharing" technology from DB2 for z/OS. It provides agility to rapidly scale up or down capacity as needed with little application change. The company Triton built a basic 2-node pureScale cluster within a budget of under £1K to validate IBM's claims and gain hands-on experience. Their testing showed the cluster delivered 1000 transactions per second under load. The summary concludes that pureScale provides robust clustering with excellent price/performance.
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Top 10 DB2 Support Nightmares #9
- 1. Top 10 DB2 SupportTop 10 DB2 SupportTop 10 DB2 SupportTop 10 DB2 Support Nightmares & How toNightmares & How toNightmares & How toNightmares & How to Avoid ThemAvoid ThemAvoid ThemAvoid Them #9#9#9#9
- 2. Part 9 – In the event of an emergency call The situation Image of a junior DBA A customer was running HADR for disaster recovery. They had no cluster software used for monitoring or failover. HADR was being monitored on a regular basis using a shell script.
- 3. Then what happened…? Disk failure on the primary site! Some tablespaces were put into “Rollforward Pending” state. Transactions accessing data in these tablespaces failed
- 4. Image of a junior DBA The last run of the HADR state monitoring script indicated a Peer State so it was decided to issue TAKEOVER command on the DR site to switch roles. When the application started, some transactions failed with the same error as on the primary site. List tablespaces command showed a number of tables in Rollforward Pending state. To get out of the pending state, ROLLFORWARD command was issued with the list of affected tablespaces. The rollforward was trying to retrieve a log, which was a few thousand logs older than the current one. After a few tries the ROLLFORWARD was given up. The database was restored from the latest backup image
- 5. • We went through the db2diag.log and the notification logs. We could see that there were physical errors reported in some of the tablespaces on the DR site around 100 days prior to the incident. This was reported in the db2diag.log and the affected tablespaces were “excluded from the rollforward set” • Based on other entries in the db2diag file, we were able to confirm that the log file requested for rollforward on the DR site was used at the time the physical errors occurred there. • HADR continued to apply logs for the other tablespaces and was reporting to be in “Peer” State. In reality, some of the tablespaces were being ignored. Triton Analysis
- 6. Regular monitoring on the log files is essential to identify and resolve the issue on the DR site in advance of this incident. Make sure you know who to call before disaster strikes! Triton Consulting +44 870 2411 550 www.triton.co.uk The moral of the story