It’s important to install SQL Server service packs whenever they are available and keep database servers up-to-date. Service Packs contain important fixes and they are tested rigorously than incremental releases like cumulative updates, so they’re pretty important to install and make the SQL server bug free. But they may contain some changes to the system that occur unexpected side effects, so you need to test your application with the service pack before you install it in production database server. Service packs correct known problems and provides updates that extend product functionality. SQL Server service packs keep the product current, and extend and update your SQL Server functionality. Thay are cumulative; each new service pack contains all the fixes in previous service packs, as well as any new fixes.
Available SQL Server service packs and direct download links.
| SQL Server | Service Pack | Description | Download Link |
| SQL Server 2005 | SP1 | SQL Server 2005 SP1 upgrade all editions and service levels of SQL Server 2005 to SP1. | http://www.microsoft.com/en-us/download/details.aspx?id=22954 |
| SQL Server 2005 | SP2 | SQL Server 2005 SP2 service pack upgrades all service levels of SQL Server 2005 to SP2. | http://www.microsoft.com/en-gb/download/details.aspx?id=9969 |
| SQL Server 2005 | SP3 | SQL Server 2005 SP3 service pack upgrades all service levels of SQL Server 2005 to SP3. | http://www.microsoft.com/en-us/download/details.aspx?id=14752 |
| SQL Server 2005 | SP4 | SQL Server 2005 SP4 contains the hotfixes that were included in cumulative update packages for SQL Server 2005 Service Pack 3 from cumulative update package 1 to cumulative update package 11. | http://www.microsoft.com/en-gb/download/details.aspx?id=7218 |
| SQL Server 2008 | SP1 | SQL Server 2008 SP1 upgrade all editions and service levels of SQL Server 2008 to SP1. | https://www.microsoft.com/en-gb/download/details.aspx?id=20302 |
| SQL Server 2008 | SP2 | SQL Server 2008 SP2 upgrade all editions and service levels of SQL Server 2008 to SP2. | http://www.microsoft.com/en-gb/download/details.aspx?id=12548 |
| SQL Server 2008 | SP3 | SQL Server 2008 SP3 contains the cumulative updates of SQL Server 2008 SP2 cumulative update package 1 to 4 | http://www.microsoft.com/en-us/download/details.aspx?id=27594 |
| SQL Server 2008 | SP4 | SQL Server 2008 SP4 upgrade all editions and service levels of SQL Server 2008 to SQL Server 2008 SP4. | http://www.microsoft.com/en-us/download/details.aspx?id=44278 |
| SQL Server 2008 R2 | SP1 | SQL Server 2008 R2 SP1 upgrade all editions of SQL Server 2008 R2 to SP1. | http://www.microsoft.com/en-gb/download/details.aspx?id=26727 |
| SQL Server 2008 R2 | SP2 | SQL Server 2008 R2 SP2 contains the hotfixes that were included in Cumulative Update 1 through Cumulative Update 5 for SQL Server 2008 R2 Service Pack 1 (SP1). | https://support.microsoft.com/en-us/kb/2630458 |
| SQL Server 2008 R2 | SP3 | SQL Server 2008 R2 SP3 upgrades all editions and service levels of SQL Server 2008 R2 to SQL Server 2008 R2 SP3. | http://www.microsoft.com/en-us/download/details.aspx?id=44271 |
| SQL Server 2012 | SP1 | SQL Server 2012 SP1 upgrade all editions and service levels of SQL Server 2012 to SP1. | https://www.microsoft.com/en-gb/download/details.aspx?id=35575 |
| SQL Server 2012 | SP2 | SQL Server 2012 SP2 upgrade all editions and service levels of SQL Server 2012 to SP2. | https://www.microsoft.com/en-gb/download/details.aspx?id=43340 |
| SQL Server 2014 | SP1 | SQL Server 2014 SP1 upgrades all editions and service levels of SQL Server 2014 to SQL Server 2014 SP1. | http://www.microsoft.com/en-us/download/details.aspx?id=46694 |
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