Tag: performance

SQL Server Default Configurations That You Should Change

Who here takes the time to adjust default values for SQL Server Configuration after installing it? Unless your company has specific Post-Installation Tasks procedures/document, SQL Server configurations are left as is until an issue comes along. If you are doing your…

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Duplicate Indexes in MySQL

Valerie Parham-Thompson explains why duplicate (redundant) indexes are sometimes helpful.

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Investigating IO Performance on Amazon RDS for Oracle

Maris Elsins, Lead Database Consultant at Pythian, provides an in-depth examination of IO Performance on Amazon RDS for Oracle.

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How to Store Performance Counters Directly on SQL Server Using TypePerf Command

Introduction Every DBA should know that the baseline is one of the most important pieces to make a proactive troubleshoot to discover potential problems in your SQL Server environment. The baseline is a key point to measure the instance performance…

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Analyze Index Validate Structure – The Dark Side

Know the performance implications of a command before deciding to use it.

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Oracle’s CREATE INDEX command can take a hint

Christo Kutrovsky, ATCG Principal Consultant and Oracle ACE at Pythian, shares something useful he discovered by accident when playing with Auto DOP.

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Use Case for SQL Server Table Partitioning

Michelle Gutzait, one of Pythian’s SQL Server Experts, offers some helpful use cases for those who have trouble deciding which tables they should partitioning or not.

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Recursion in Hive – Part 1

In Part 1 of this series, Valentin Nikotin, will teach you about migrating from RDBMS to Hive, while maintaining the simplicity and flexibility of a SQL approach.

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ORA-10173: Dynamic Sampling Time-Out Error

  Recently on a heavily used and freshly upgraded 12.1.0.2 ware-house type database, we started seeing lots of ORA-10173 dumped into the alert log. The information out there on this error is somewhat sparse, and it is often linked to…

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High “cursor: pin S wait on X” waits?

If your system meets any of the following criteria: – Oracle 12.1.0.2.0 or higher – Partitioned tables – Parallel query heavily used – Bind variables in use, as they should be and, you’re seeing unusually high “cursor: pin S wait…

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