Category: Monitoring

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DB2 Administrative SQL Cookbook: Column Selectivity by Table (BLU)

Purpose This statement reports how selective at the column level queries are that run against a specific table. This does not look at overall selectivity or row selectivity. It will only work in DB2 10.5. BLU performs best when not all columns are referenced by queries. Source While I’ve modified this statement, it started with statements from these two sources,...

select2 0

DB2 Administrative SQL Cookbook: BLU Compression Ratios

Purpose This statement calculates the compression ratio for BLU tables. The compression ration can be used to help identify tables where compression is not optimal and you may need to look into why. Compression is critical to optimal performance on BLU. Understanding Compression Ratios. Compression ratios across platforms and outside of databases are generally represented as: Compression Ratio = Compressed...

Jim 6

Locking Event Monitors and Compression

UPDATE, 10/21/2015: Please see the comment from IBM at the end stating that despite the information they gave Jim via PMR, this compression does not cause a lack of license compliance even if you are not licensed for compression. Abby Rosmarin said, “Hard work, determination and talent are key for any successful venture. But sometimes you need that fourth ingredient:...

IanB 6

Generating Log Archive Activity Histograms

A few weeks ago, Ember posted a tweet mentioning that being able to see a histogram showing frequency of transaction log archive activity would be helpful. I had already done some work in this area by parsing the diagnostic log file (db2diag.log) for log archive messages, but I thought I could throw together a quick example of how to do this using...

Abhik 2

DB2 Workload Manager (WLM) as a Monitoring Solution– Analyzing WLM Information (Part 3 of 3)

This is part three of a three part series. The full series includes: DB2 Workload Manager (WLM) as a Monitoring Solution – Understanding WLM (Part1 of 3) DB2 Workload Manager (WLM) as a Monitoring Solution– How to Set up WLM (Part 2 of 3) DB2 Workload Manager (WLM) as a Monitoring Solution– Analyzing WLM Information (Part 3 of 3) The...

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DB2 Basics: MONREPORT

If you’re mourning the loss of “RESET MONITOR ALL”, there are a number of ways you can address that. Ideally, you’d use this approach: http://www.ibm.com/developerworks/data/library/techarticle/dm-1009db2monitoring1/, but there are some arguments for using MONREPORT over that in some ways. One argument is that MONREPORT is built-in and you don’t have to add objects to make it work. The disadvantages are a...