During a transaction, data is written to the log cache so that it’s ready to be written to the log file on commit, or can be rolled back if necessary. When the log cache is being flushed to disk, the SQL Server session will wait on the WriteLog wait type. If this happens all the time, it may suggest disk bottlenecks where the transaction log is stored.
Checking program code into source control is a daily ritual for most developers, but versioning database code is less well-understood. Grant Fritchey argues that getting your databases under source control is not only vital for the stability of development and deployment, but it will make your life easier when something does go wrong.
SQL Server 2012 introduced columnstore indexes, which can immensely improve the performance of OLAP queries. How were they updated and improved in SQL Server 2014?
Many DBAs back up their user databases, but not their system databases. Whatever the reason for the lack of a backup, John Grover explains how to save yourself (mostly) should you ever find yourself with no viable master database and no good backup.
Red Gate’s running a half-day training workshop at their UK head office in Cambridge on Aug 8. It’ll show you how to link your database source control repository to your build system as the starting point for continuous integration.
A lot of numbers that we use everyday such as Bank Card numbers, Identification numbers, and ISBN codes, have check digits. As part of the routine data cleansing of such codes we must check that the code is valid- but do we? Dwain Camps shows how it can be done in SQL in such a way that it could even be used in a constraint, and keep bad data out of the database.
The SSC team has put together a little quiz on database source control to go with Rob Richardson, Robert Sheldon, and Tony Davis' new book, SQL Server Source Control Basics. Do you daydream about source control... or daydream to avoid it?
This article demonstrates a method of importing a data file directly into a temporary table and selectively inserting data from the temporary table into a SQL Server table, all in a single set of SQL commands.
Good documentation gets you started. Good books get you deep. After years of working...
By Vinay Thakur
In previous posts, we looked at the SQL Server engine. for us DBAs, the...
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You have used Claude. But which Claude? The Claude app (claude.ai, the desktop and...
Comments posted to this topic are about the item Creating a JSON Document IV
By VishnuGupthanSQLPowershellDBA
Comments posted to this topic are about the item Restoring Azure Key Vault Keys...
When the schema of an object is changed, SQL Server wipes out the previous...
I have this data in a table called dbo.NFLTeams
TeamID TeamName City YearEstablished ------ -------- ---- --------------- 1 Cowboys Dallas 1960 2 Eagles Philadelphia 1933 3 Packers Green Bay 1919 4 Chiefs Kansas City 1960 5 49ers San Francisco 1946 6 Broncos Denver 1960 7 Seahawks Seattle 1976 8 Patriots New England 1960If I run this code, how many rows are returned?
SELECT YearEstablished, json_objectagg(city : TeamName) FROM dbo.NFLTeams GROUP BY YearEstablished;See possible answers