A tag is a keyword or label that categorizes your question with other, similar questions.

All versions of Microsoft SQL Server (not MySQL). Please also add a version-specific tag, like sql-server-2016, since it is often relevant to the question.
32940 questions
All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.
22059 questions
All versions of PostgreSQL. Add an additional version-specific tag like [postgresql-13] if that context is relevant.
15937 questions
All versions of Oracle database. Add a version-specific tag like oracle-11g-r2 if that context is important in the question. Do not use for Oracle products such as applications or middleware or other database products owned by Oracle, like MySQL or BerkeleyDB.
7663 questions
An evaluation of whether a system works well enough to be fit for purpose. Normally performance refers to the speed with which a system completes an operation or set of operations over time.
6356 questions
The development of the conceptual schema and/or the logical model and/or the physical settings of a database.
6175 questions
SQL Server 2012 (major build version 11.00.xxxx). Please also tag sql-server.
4554 questions
SQL Server 2008 (major build version 10.00.xxxx). Please also tag with sql-server.
3899 questions
SQL Server 2008 R2 (major build version 10.50.xxxx). Please also tag with sql-server.
3808 questions
Replication is the process of sharing any level of information so as to ensure consistency between redundant hardware/software resources to improve reliability, fault-tolerance, and accessibility
3387 questions
For questions about improving the performance and/or efficiency of database queries.
3255 questions
A database structure that can improve the speed of queries at the cost of disk space and slower inserts/updates. It stores a copy of one or more columns sorted but structures the data differently to allow faster access.
3163 questions
Transact-SQL (T-SQL) is a dialect of SQL used by Microsoft SQL Server and SAP's Sybase.
3002 questions
SQL Server 2014 (major build version 12.0.xxxx). Please also tag sql-server.
2763 questions
SQL Server 2016 (major build version 13.00.xxxx). Please also tag sql-server.
2691 questions
Making copies of data which may be restored after a data loss event or to recover data from some earlier point in time.
2593 questions
Open source RDBMS that forked from MySQL. Add a version-specific tag like mariadb-10.5 if that context is important.
2474 questions
All versions of MongoDB - a scalable, high-performance, open-source, document-oriented database.
2361 questions
InnoDB : MySQL's ACID-compliant Storage Engine
2208 questions
An SQL join clause combines records from two or more tables or views.
1952 questions
In the context of a database, optimisation refers to the process of the query optimiser selecting an efficient physical execution plan.
1941 questions
Callable code installed on a database manager, exposing an API through which it can be invoked. Normally written in the native query language, some DBMS platforms support other languages as well.
1632 questions
Privileges granted to an account or role through the security mechanism of an operating system, database manager or other system.
1542 questions
Availability Groups are a new feature of SQL Server 2012 that provide continuous data synchronization, automatic failover and secondary read access for one or many SQL Server databases.
1477 questions
Writing queries to request or change information stored in a database or other information management system. Questions should include table and index definitions, sample data, expected output, and a tag for the specific system (e.g. MySQL, PostgreSQL, Oracle, SQL Server, MongoDB).
1466 questions
Procedural code automatically executed in response to a database event.
1446 questions
Reloading a database from a backup, typically for disaster recovery, or to make a copy of a database onto another server.
1386 questions
Oracle Database 11g Release 2. Please also tag oracle for search purposes.
1373 questions
SQL Server 2005 (major build version 9.00.xxxx). Please also tag sql-server.
1331 questions
MySQL version 5.5 - please also tag with mysql for search purposes.
1217 questions
SQL Server Management Studio, a graphical front-end tool shipped with SQL Server for managing and querying databases. It also supports managing other bundled systems such as SSAS.
1208 questions
The strategy selected by the query optimizer to process a query.
1131 questions
Allowing users to access only the data they are authorized to access. It also encompasses protection of data during movement on the network and storage on disks and backups.
1074 questions
SQL Server Integration Services, an ETL tool sold by Microsoft and bundled with SQL Server versions since SQL Server 2005.
1071 questions
MySQL version 5.7 - please also tag with mysql for search purposes.
1062 questions
A core SQL statement, SELECT retrieves data from one or more tables or other sources of row set data such as views or table-valued functions.
1052 questions
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