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SHOW VARIABLES Shows Variables MySQL Does Not Know About

The listing of Dynamic System Variables on the MySQL Reference Manual’s page is supposed to show those variables you can change on-the-fly. The link at the top of this post, links to the 4.1 version of the manual, just in case folks are thinking I’m using a newer manual version. Mind you, I have this problem with 5.0.45 as well as 4.1.20.

Oracle Data Pump 11g: Little-Known New Feature

While perusing the Oracle 11g Data Pump documents recently, I noticed a new parameter that was introduced in Oracle 10g, but I had missed it there. The parameter is TABLE_EXISTS_ACTION, and it applies only to the Data Pump Import. Basically, this feature allows you to decide how to handle importing data if a table already exists. Let’s create a simple test case to demonstrate.

Where is Storage QoS?

In the era of consolidation, storage has not been left out. The impact of backup on normal database activity . . . batch processing in one database impacting transactional processing — these are two real life examples of the consequences of storage consolidation known to almost every DBA. Virtualization puts a new twist in consolidation, but storage virtualization methods are very under-developed compared to computing resource virtualization. Storage QoS and storage virtualization must necessarily be very closely-related areas with a lot of overlap.

Query Profiling Tools — Part 1, mysqlsla

The “sla” in mysqlsla stands for “statement log analyzer”. This does a much better job than mysqldumpslow of analyzing your slow query log. This is really good for weeding out pesky entries in the slow query log that you do not care about. In this case, I’m using –slow to read the slow query log at the filename specified, –flat to flatten all the text to lowercase (basically case-insensitive matching) and –sort at to sort by “average time”.

Pythian Goodies: The Answer to Free Memory, Swap, Oracle, and Everything

I gave this talk covering the different types of memory, how to monitor memory, and how to optimally use it with Oracle at the UKOUG, I have since received requests to post the slides online. Instead of just posting the PowerPoint I took some time to give the presentation again (internally here at Pythian) and this time we recorded the session and are posting it in a variety of formats. This is a bit of a departure from the typical Pythian Goodies, in that it is scripted, and there is a lot of content here in the whitepaper.

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