what-is-a-foreign-key-in-sql-server 
SQL Shack
APRIL 21, 2021
This article will describe the effect of SQL Server foreign keys on query plans which are created by the query optimizer. Introduction Foreign keys are used to enforce the referential integrity between the data of the two tables and are frequently used in relational database designs.
Smashing Magazine
SEPTEMBER 28, 2022
The resource loading waterfall is a cascade of files downloaded from the network server to the client to load your website from start to finish. What do you see there? There are millions of sites, and you are in close competition with every one of those Google search query results. Three seconds is a very short amount of time.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
SQL Performance
APRIL 17, 2020
Along with a large number of restrictions on what is even possible with this command, there is always the question of performance. Ultimately, tables are stored as a sequence of bytes with some metadata elsewhere in the system to describe what each of those bytes mean, and how they relate to each of the table's various columns.
SQL Server According to Bob
NOVEMBER 29, 2016
Back in June, Bob Dorr gave you the thinking behind why SQL Server 2016 It Just Runs Faster due to changes in our SQL Server and NUMA configurations. Bob blogged about a new SQL Server 2016 feature called Auto Soft NUMA. 144 total logical processors as exposed by the Windows OS and seen by SQL Server.
SQL Performance
MARCH 11, 2020
In the previous articles ( Part 1 , Part 2 , and Part 3 ), I covered the meaning of the NULL as a marker for a missing value, how NULLs behave in comparisons and in other query elements, and standard NULL handling features that are not yet available in T-SQL. A primary key is not allowed on NULLable columns. Standard UNIQUE constraint.
Percona
APRIL 3, 2023
Object identifiers (OIDs) are used internally by PostgreSQL as primary keys for various system tables. We are all aware that PostgreSQL 10 has reached end of support , and there is a need to upgrade to the latest version or any application-compatible PG version. Below are some of the upgrade options available to upgrade to PG11 or above.
Percona
DECEMBER 14, 2022
What is this sizzling feature that I speak of you ask? The key goals of OLTP applications are availability, speed, concurrency, and recoverability. This blog is the result of my investigation into column-wise tables. Hopefully, you will find it useful in your deliberations. The missing sizzle. Column-wise tables! OLTP vs OLAP.
Expert insights. Personalized for you.
71 
Let's personalize your content