Oracle Performance Tuning: Practical Techniques Every DBA Should Master
Here are a few things every Oracle DBA should know about performance in their databases.
2025-10-03
1,363 reads
Oracle
Oracle Architecture Overview
In this document I will share an overview of Oracle’s architecture that isn’t complete, but it will give you a basic understanding of how the architecture works, especially if you are coming from other database platforms.
2025-01-24
SQL Server vs Oracle Query Statistics to Improve Performance
In this article, learn how to query cached query statistics and execution plans for Oracle or SQL Server to identify code that can be optimized to improve performance.
2023-07-21
The SELECT Statement in Oracle
The SELECT statement is used to retrieve information from a database. Following the execution of a SELECT statement, a tabular result is held in a result table (called a result set). It allows you to select the table columns depending on a set of criteria. In this article, I will introduce the basic SELECT statement fetching data from just one table.
2023-06-21
Oracle optimizer removing or coalescing subqueries
The Oracle optimizer often changes the query to get better performance. In this article, Jonathan Lewis explains two more optimizations involving subqueries.
2022-05-25
Why your PL/SQL needs to be testable – and how to do it: Part 1
Part 1: What is testable code, why is it important, and first glimpses on practices that can help
2022-04-27
Oracle subquery caching and subquery pushing
In this article, Jonathan Lewis discusses why you might want to stop the optimizer from unnesting some subqueries and how to control where the optimizer positions each subquery.
2022-04-11
The effects of NULL with NOT IN on Oracle transformations
IN and NOT IN subqueries are frequently used in Oracle. Jonathan Lewis explains how the optimizer handles NULL with IN and NOT IN.
2022-03-18
Oracle ASM: Migrating from UDEV devices to the ASM Filter Driver
This article looks at the way in which you can convert unmanaged devices to the ASM filter drive in an Oracle system.
2022-03-04
4,444 reads
Running SQL Server on Oracle and Google Cloud
In this article, we will analyze the various out-of-the-box deployment options Oracle Cloud Infrastructure and Google Cloud Platform offers to host a Microsoft SQL Server database. This information can prove to be handy while deciding on the best cloud provider to host a given application or database.
2022-02-18
7,138 reads
Blogs
PASS: Quantum Computing Slides
By Brian Kelley
If you're an attendee at the PASS Data Community Summit this year, there are...
A New Word: Dead Reckoning
By Steve Jones
dead reckoning– v. intr. finding yourself bothered by somebody’s death more than you would...
PASS Data Community Summit 2025 Slides and Code
By alevyinroc
Thank you for attending my PASS Summit 2025 session Answering the Auditor’s Call with...
Forums
Personal Contact Is Vital
Comments posted to this topic are about the item Personal Contact Is Vital
Getting the Schema for Tables
Comments posted to this topic are about the item Getting the Schema for Tables
An Unexciting Exciting Release
Comments posted to this topic are about the item An Unexciting Exciting Release
Question of the Day
Getting the Schema for Tables
What happens when I run this on SQL Server 2022 in the AdventureWorks2022 database?
SELECT OBJECT_DEFINITION (OBJECT_ID(N'Person.Person')) AS [Object Definition]; GOSee possible answers