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Thursday, June 26, 2014

ASM Metadata, Internals and Diagnostic Utilities

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If you use ASM on a regular basis, you may find that knowledge of the internals can be very useful for advanced troubleshooting and in gene...
Friday, May 30, 2014

Oracle Optimizer Investigated with Flame Graphs

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Topic: This post is about investigating the Oracle Optimizer using stack sampling and flame graphs. We will see how the complexity of the O...
Friday, May 9, 2014

Flame Graphs for Oracle

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Topic: This post is a hands-on introduction to using on-CPU Flame Graphs for investigating Oracle workloads. This technique is about co...
Friday, April 25, 2014

A Closer Look at CALIBRATE_IO

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Topic: This blog entry is about investigating Oracle's DBMS_RESOURCE_MANAGER.CALIBRATE_IO Spoiler alert:  For quantitative analysis of...
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Wednesday, March 26, 2014

Recent Updates of OraLatencyMap and PyLatencyMap

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Topic: This post introduces the latest changes to OraLatencyMap and PyLatencyMap, two custom tools for collecting and displaying Oracle wai...
Tuesday, February 25, 2014

Wait Event History Sampling, an Experiment in Oracle Performance Analysis

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Topic: This post is about a performance analysis technique based on high frequency sampling of wait event history data in Oracle. Two scrip...
Friday, January 31, 2014

Clusterware 12c and Restricted Service Registration for RAC

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Topic: This post is about exploring the mechanisms used by Oracle Clusterware 12.1.0.1 to restrict remote service registration, i.e. the 12...