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
Oracle
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 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
4,754 reads
Transformations by the Oracle Optimizer
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
Install SQL Server and Oracle using PowerShell and Windows Containers
In this article we look at how to install SQL Server and Oracle using PowerShell to create development environments using Windows Containers.
2022-01-28
SQL String functions in SQL Server, Oracle and PostgreSQL
In this article we look at how to use string functions to concatenate, replace, trim and get substrings in SQL Server, Oracle and PostgreSQL.
2021-10-25
Text Mining and Sentiment Analysis: Oracle Text
Oracle has built-in functionality to analyze text. Sanil Mhatre demonstrates how to perform a sentiment analysis on data stored in a table using Oracle Text.
2021-09-15
Oracle sequences – 12c features including “identity”
Oracle added several enhancements to the sequence object in version 12c, including an “identity” column feature. Jonathan Lewis explains how to work with these new features.
2021-09-10
SQL VIEW Comparison in SQL Server, Oracle and PostgreSQL
In this article we look at the similarities and differences for views in SQL Server, Oracle and PostgreSQL. We also look at indexed views, materialized views and updatable views.
2021-08-16
Typical uses of Oracle sequences
Oracle sequences supply unique numbers that can be used when populating tables. In this article, Jonathan Lewis explains the typical uses of Oracle sequences.
2021-08-04
Blogs
Using the Data API Builder–VS Live San Diego Resources
By Steve Jones
Thanks for attending my sessions. Resources below: Slides: Using Data API Builder GitHub repo: ...
Running a Local LLM On Your Laptop Resources
By Steve Jones
Thanks to everyone that attended my sessions at VS Live San Diego yesterday. It...
Differences Between xp_readerrolog and sp_readerrorlog: #SQLNewBlogger
By Steve Jones
I was creating a question on sp_readerrorlog and realized that this procedure is different...
Forums
Having some performance issues with linked server query
When I run my query from DW, which uses a linked server, it times...
Implementing Type 4 Slowly Changing Dimensions in SQL Server
Comments posted to this topic are about the item Implementing Type 4 Slowly Changing...
The Disabled Index
Comments posted to this topic are about the item The Disabled Index
Question of the Day
The Disabled Index
I run this code on SQL Server 2022.
CREATE TABLE Drink
(
drinkid INT NOT NULL
CONSTRAINT DrinkPK PRIMARY KEY CLUSTERED,
drinkname VARCHAR(20),
rating NUMERIC(2, 1)
)
GO
INSERT INTO Drink
(
drinkid,
drinkname,
rating
)
VALUES
(1, 'Margarita', 4.5),
(2, 'Mojito', 4.3),
(3, 'Old Fashioned', 4.7),
(4, 'Martini', 4.4),
(5, 'Cosmopolitan', 4.2)
GO
ALTER INDEX drinkpk ON dbo.drink DISABLE
GO
SELECT * FROM dbo.Drink
GO
What is the result? See possible answers