Tag: Oracle

Error ORA-01033 After Doing a Switchover in a 12.1 RAC Environment

The other day I did a switchover in a RAC environment , which went pretty smooth , but after doing the switchover in the primary, I kept getting the following error: SELECT dest_name,STATUS,error FROM gv$archive_dest_status WHERE dest_id=2;   DEST_NAME ——————————————————————————–…

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Bushy Join Trees in Oracle 12.2

There are multiple optimizer features introduced in the Oracle Database 12.2 Release. Bushy Join Trees is the one that I’ll be demonstrating in this post. First, I’ll create four tables with two indexes: CREATE TABLE t1 AS SELECT rownum n1,…

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Log Buffer #508: A Carnival of the Vanities for DBAs

This Log Buffer Edition covers Oracle, SQL Server and MySQL.

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How to Patch an Exadata (Part 6) – Timing

Quick links to Part 1 / Part 2 / Part 3 / Part 4 / Part 5 / Part 6     6: Timing Now that we know how to patch every component and the different options available to do…

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How to Patch an Exadata (Part 1) – Introduction and Prerequisites

Once you have installed your new Exadata machine will come a time where you’ll be asked : “shouldn’t we patch the Exadata” ? And the answer is “yes, definitely“.   Indeed, Oracle releases huges (~ 10 GB) “Quarterly Full Stack” patches (aka…

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Log Buffer #507: A Carnival of the Vanities for DBAs

This Log Buffer edition covers Oracle, SQL Server and MySQL blog posts with a touch of Cloud.

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The Side Effects of Drop ‘Unused’ Index

In this blog post I’ll demonstrate a scenario where dropping a potentially ‘unused’ index can have a negative influence on the optimizer’s cardinality estimation. Having columns with logical correlation and skewed data can cause difficulties for the optimizer when calculating…

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Reading Execution Plans for Parallel DML

Parallel execution in Oracle seems to be a topic of myths, mysteries and misunderstandings. In this post I hope to clear up at least one of them by diving into a discussion about parallel DML. Actually, I want to show…

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Oracle New Public Cloud Licensing Policy – Good or Bad?

A little while ago after a question from a customer about supporting Oracle products on the Google Cloud Platform (GCP) I decided to take a look for any updates to the Oracle public cloud support policies. The document can be…

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Log Buffer #505: A Carnival of the Vanities for DBAs

This Log Buffer Edition searches through various blogs of Oracle, SQL Server and MySQL and picks a few contemporary ones.

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