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
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 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
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
Part 1: What is testable code, why is it important, and first glimpses on practices that can help
2022-04-27
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
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
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
4,329 reads
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
7,074 reads
To troubleshoot poorly performing SQL in Oracle, you must understand which transformations the optimizer has made. Jonathan Lewis demonstrates several possible optimizations for one query.
2022-02-09
By Steve Jones
I think we might have forgotten this a bit, but on one of the...
By Brian Kelley
I refresh my test SQL Servers at least monthly with a fresh VM. Setting...
By Chris Yates
Embracing Total Responsibility In every organization there comes a moment when teams must choose...
We are using MySQL version 5.6 in our Windows Server 2012 R2 environment. We...
We have created a parent table, child table & Audit log table in SQL...
I run this command on my SQL Server 2022 database:
ALTER DATABASE AdventureWorks2017 SET CHANGE_TRACKING = ON;What is the default data retention period? See possible answers