Tag: performance

It’s well known that mmap helps to improve performance in particular use-cases (especially if your working set fits an available memory). This doesn’t mean that the file itself has to fit memory. mmaps provides real benefits over the other IO…

One of the interesting features introduced in MySQL 5.7 is that innodb_buffer_pool_size is a dynamic variable (since 5.7.5, to be more specific). Yet, past experience tells us that just because a variable is dynamic, it does not make it is…

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…

MongoDB’s database profiler lets us collect some performance data about operations happening on a MongoDB instance. In this post, I will show you how we can enable the profiler, what kind of information it can store for us, how to query this…

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…

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

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

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…

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

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