Microsoft SQL Server Compact (SQL CE) is a discontinued

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produced by

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for applications that run on mobile devices and desktops. Prior to the introduction of the desktop platform, it was known as ''SQL Server for

Windows CE Windows CE, later known as Windows Embedded CE and Windows Embedded Compact, is a discontinued operating system developed by Microsoft for mobile and embedded devices. It was part of the Windows Embedded family and served as the software foun ...

'' and ''SQL Server Mobile Edition''. It includes both 32-bit and 64-bit native support. SQL CE targets occasionally connected applications and applications with an embedded database. It is free to download and redistribute. An

ODBC In computing, Open Database Connectivity (ODBC) is a standard application programming interface (API) for accessing database management systems (DBMS). The designers of ODBC aimed to make it independent of database systems and operating systems. An ...

driver for SQL CE does not exist, nor is one planned. Native applications may use SQL CE via OLE DB. The latest, and last, release is SQL Server Compact 4.0. In February 2013 SQL Server Compact Edition had been deprecated; no new versions or updates are planned, although Microsoft continued to support the product until July 2021.

Overview

SQL Server Compact shares a common

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with the other

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editions. It also includes ADO.NET providers for data access using ADO.NET APIs, and built-in synchronization capabilities, as well as support for LINQ and

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. Future releases will unify the synchronization capabilities with Microsoft Synchronization Services. Unlike other editions of

, SQL CE runs in-process with the application which is hosting it. It has a disk footprint of less than 2 MB and a

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of approximately 5 MB. SQL CE is optimized for an architecture where all applications share the same memory pool.

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s for Windows 8 cannot use SQL Server Compact edition, or any other edition of SQL Server.

Support

SQL CE databases can support

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-compliance, but do not meet the durability requirement by default because AutoFlush buffers changes in memory (including enlisted ambient transactions and explicit SQL CE transactions that do not override the Commit() call with an CommitMode.Immediate value). Therefore, committed transaction changes can be lost. To meet the durability requirement the commit call on the transaction must specify the immediate flag. Like

, SQL CE supports transactions, referential integrity constraints, locking as well as multiple connections to the database store. However,

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s are not supported, even though parallel transactions (on different tables) are. The current release does not support stored procedures or native

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data type either. It uses a subset of T-SQL for querying and due to lack of XML support,

XQuery XQuery (XML Query) is a query language and functional programming language designed to query and transform collections of structured and unstructured data, primarily in the form of XML. It also supports text data and, through implementation-sp ...

is not supported either. Queries are processed by an optimizing query processor. SQL CE databases also support indexing, as well as support remote data replication (local caching of data in remote databases) and merge replication (bidirectional synchronization with master databases). SQL CE databases can be created and managed from

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and some older versions of

SQL Server Management Studio Microsoft SQL Server Management Studio (SSMS) is a software application developed by Microsoft that is used for configuring, managing, and administering all components within Microsoft SQL Server. First launched with Microsoft SQL Server 2005 ...

as well.

File format

SQL CE databases reside in a single ''.sdf'' file, which can be up to 4 GB in size. The ''.sdf'' file can be encrypted with 128-bit

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for data security. SQL CE runtime mediates concurrent multi-user access to the ''.sdf'' file. The ''.sdf'' file can simply be copied to the destination system for deployment, or be deployed through ClickOnce. SQL CE runtime has support for DataDirectories. Applications using an SQL CE database need not specify the entire path to an ''.sdf'' file in the ADO.NET connection string, rather it can be specified as '', DataDirectory, \.sdf'', defining the data directory (where the ''.sdf'' database file resides) being defined in the assembly manifest for the application. SQL Server Management Studio 2005 can read and modify CE 3.0 and 3.1 database files (with the latest service pack), but SQL Server Management Studio 2008 (or later) is required to read version 3.5 files. Microsoft Visual Studio Express 2008 SP1 can create, modify, and query CE 3.5 SP1 database files. SQL Server Management Studio cannot read CE 4.0 files. Visual Studio 2010 SP1 can handle CE 4.0 database files. The .sdf ("Sqlce Database File") naming convention is optional, and any extension can be used. Setting a password for the database file is optional. The database can be compressed and repaired with the option of the compacted/repaired database to be placed into a new database file.

Deprecation

In February 2013, Microsoft announced that SQL Server Compact Edition had been deprecated. Although no new versions or updates are planned, Microsoft will continue to support SQL Compact through their standard lifecycle support policy. Extended support for SQL Server Compact 4.0 ended on July 13, 2021.

References

External links

Microsoft's Embedded Database - SQL Server Compact - Team Blog
at

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