Oracle VM Consulting
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Recovering an Oracle Database with Missing Redo

Background

I ran into a situation where we needed to recover from an old online backup which (due to some issues with the RMAN “KEEP” command) was missing the archived redo log backups/files needed to make the backup consistent.  The client wasn’t concerned about data that changed during the backup, they were interested in checking some very old data from long before this online backup had started.

Visualizing the scenario using a timeline (not to scale):

Log Buffer #412, A Carnival of the Vanities for DBAs

This Log Buffer Edition makes it way through the realms of Oracle, SQL Server and MySQL and brings you some of the blog posts.

Oracle:

Introducing Oracle Big Data Discovery Part 3: Data Exploration and Visualization

FULL and NO_INDEX Hints

Exadata X5 – A Practical Point of View of the New Hardware and Licensing

Oracle recently announced its latest iteration of Exadata – X5-2. It includes a refresh of the hardware to the most recent Xeon® E5-2699 v3 CPUs. These new CPUs boost the total cores count in a full rack to 288. This is higher than the current 8 socket “big machine” version X4-8, which has only 240 cores.

Log Buffer #411, A Carnival of the Vanities for DBAs

This Log Buffer Edition brings you some blog posts from Oracle, SQL Server and MySQL.

Oracle:

Suppose you have a global zone with multiple zpools that you would like to convert into a native zone.

SQL Server 2014 Cumulative Update 6

Hello everyone,

Just a quick note to let you know that this week, while most of North America was enjoying a break, Microsoft released the 6th cumulative update for SQL Server 2014. This update contains fixes for 64 different issues, distributed as follows:

Detecting Source of MySQL Queries with Comments

As a MySQL DBA I already know the data changes that happen on my system. I have logs for that.

However, it’s a common problem that several years into the life of an application, the current developers won’t know where in the codebase queries come from. It’s often hard for them to find the location in the code if queries are formed dynamically; the pattern I show them to optimize doesn’t match anything in the code.

I stumbled on a trick a couple years ago that has been invaluable in tracking down these problematic queries: query comments.

Here’s an example:

Pythian’s Annual MySQL Community Dinner at Pedro’s

Once again, Pythian is organizing an event that by now may be considered a tradition: The MySQL community dinner at Pedro’s! This dinner is open to all MySQL community members since many of you will be in town for Percona Live that week. Here are the details:

What: The MySQL Community Dinner

When: Monday April 13, 2015 –  7:00 PM at Pedro’s (You are welcome to show up later, too!)

Log Buffer #409, A Carnival of the Vanities for DBAs

This Log Buffer Edition sheds light at some of the nifty blog post of the week from Oracle, SQL Server and MySQL.

Oracle:

Patch Set Update: Hyperion Data Relationship Management 11.1.2.3.504

The Hitchhiker’s Guide to the EXPLAIN PLAN Part 33: The mother of all SQL antipatterns?

Log Buffer #410, A Carnival of the Vanities for DBAs

This Log Buffer Edition spread love of databases just before Valentine’s Day. Lovely blog posts from Oracle, SQL Server and MySQL are here for you to love.

Oracle:

Creating a Mobile-Optimized REST API Using Oracle Service Bus by Steven Davelaar.

GROUP BY – wrong results in 12.1.0.2

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