Posts Categorized: Pythian

Batched Table Access

When I first saw the suffix BATCHED in an Oracle execution plan from 12c, I was curious to see what is hidden behind and how it works. I had some spare time for testing and wanted to share my findings with you here.

SQL Server 2014 CTP 1 – Installation failure

Recently I was trying to install SQL Server 2014 CTP 1 on my Windows Server 2008 R2 Virtual Machine to explore SQL Server 2014. What I encountered was a failure of a rule “Previous SQL Product installation” ———————————— Rule Check Result ————————————- Rule “Previous SQL product installation” failed. A SQL product other than SQL Server…

Preventing runaway queries using Resource Governor

Section A (Theory) One of the typical reasons for performance issues is runaway queries executed by end users on a busy production database. This problem is fairly common in OLAP or shared systems (OLTP/OLAP) where business users begin executing complex (and often poorly written) queries, leaving their office for hours, and expecting their data to…

Why was SSHD refusing my key?

I was contacted by a colleague about a problem he was having. “I’m trying to set up something simple which I’ve done millions of times, but it’s not working. I might be missing something obvious.” The issue was that the SSH public key authentication didn’t work. The environment was running a virtualized Oracle Enterprise Linux 6.4…

Log Buffer #346, A Carnival of the Vanities for DBAs

Economist says that Physics suggest that storms will get worse as the planet warms. Typhoon Haiyan in Philippines, bush-fires in Australia, floods in China, and extreme unpredictable weather across the planet is a sober reminder. Good news is that technology and awareness is rising, and so is the data. Database technologies are playing their part…

Oracle RAC on the Cloud, Part 3

This is part 3 of a multipart series of getting oracle RAC running on a cloud environment. In part 1, we set up a NFS server for shared storage. In part 2, we set up OS components for each RAC server. Now we finish up the OS configuration and move to Oracle grid infrastructure.

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