Tag: DBA Lounge

Query Statspack’s “SQL ordered by” Sections Over a Time Period

In this post, I’ll present the statspack_top_sqls.sql script, which returns SQL performance statistics by mining the Statspack repository. In a previous blog post, I presented the statspack_load_trends.sql and the AWR_load_trends.sql scripts, which provide a high-level overview of workload dynamics on…

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Mining Statspack and AWR Repositories for Historical Trends

There are various ways that we can approach the analysis of a past database performance problem. The initial steps usually differ based on their scope. Is it limited to a certain SQL/process/task, or is it perceived as a database-wide slowdown?…

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Three Announcements from Oracle OpenWorld You Probably Didn’t Hear

The buzz from OpenWorld this year was the permanently free Oracle Cloud offering, the new Exadata X8M (reportedly capable of 12 million I/O per second!), Oracle Autonomous Cloud at Customer, and the new Blockchain table. Here are three interesting or…

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How to Prevent Linux 7 Housekeeping from Breaking Oracle

Linux 7 introduced multiple changes and enhancements to the kernel. Among them was automated housekeeping for temporary files. In version 6, tmpwatch is available to manage unused files in temp directories. It can be scheduled via cron to automatically keep…

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How to retrieve growth history for oracle tablespaces

A customer recently asked us to identify tablespaces that most contributed to sudden space consumption on ASM. It’s easy enough to find what’s using the most space, but finding what’s been growing is a little less straightforward. Fortunately, Oracle keeps…

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Listener over Infiniband on Exadata (part 1)

Nice topic, right? Beautiful thing to work with when you have Oracle Engineered Systems. So, why would you configure a listener over the InfiniBand Network? How does that make sense in your environment and how would you leverage that? Background…

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Shutdown while upgrading to 18c

My colleague and friend Gleb Otochkin has already blogged about installing 18c – Installing Oracle 18c using command line – but I thought that I would share my experience. My plan was to upgrade my 12.2 pluggable database to 18c…

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Azure SQL managed instance: new member of the family!

SQL Server is one of Microsoft’s strongest enterprise software products. Both in terms of revenue and industry reputation, it is widely adopted for its ease of use while at the same time offering high end features in terms of security,…

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Oracle service secrets: migrate transparently

In the third post in this series, Bjoern Rost, Principal Consultant at Pythian, explains how to migrate transparently using Oracle services.

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InnoDB flushing and Linux I/O

Ivan Groenewold, MySQL Database Consultant at Pythian breaks down InnoDB flushing and Linux I/O.

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