Feeds

High Availability with SQL Server

Resilience and robustness are key characteristics of Enterprise databases

  • alert
  • submit to reddit

Security for virtualized datacentres

High availability can be provided in various ways – SQL Server 2005 supports mirroring, fail-over clustering and backup log shipping.

Backup log shipping is the simplest and cheapest high availability system and appears in the workgroup edition of SQL Server 2005 and above. Essentially, it means the shipping of the transaction logs from the database at very regular intervals to another machine, where they are either stored or immediately applied to a copy of the database. Should the original machine fail the alternative can be brought on line relatively rapidly.

Mirroring is more expensive to implement but it does provide a more resilient solution. A synchronised copy of the database is maintained on a separate machine. The mirror can share the load placed on the original database: for example, the original might handle the transactional load and queries and reports can be run against the mirror. Once you have a mirror in place, failover clustering can be implemented to ensure that, should one of the copies fail, the other takes over automatically.

Mirroring (with a two CPU per server limit) and failover clustering (two node limit) are available in the Standard edition of SQL Server 2005. Both are unrestricted in the Enterprise edition.

Return to Page 1 of main article here - otherwise use "back" button.

Security for virtualized datacentres

More from The Register

next story
Microsoft to bake Skype into IE, without plugins
Redmond thinks the Object Real-Time Communications API for WebRTC is ready to roll
Microsoft promises Windows 10 will mean two-factor auth for all
Sneak peek at security features Redmond's baking into new OS
PEAK APPLE: iOS 8 is least popular Cupertino mobile OS in all of HUMAN HISTORY
'Nerd release' finally staggers past 50 per cent adoption
Mozilla: Spidermonkey ATE Apple's JavaScriptCore, THRASHED Google V8
Moz man claims the win on rivals' own benchmarks
FTDI yanks chip-bricking driver from Windows Update, vows to fight on
Next driver to battle fake chips with 'non-invasive' methods
DEATH by PowerPoint: Microsoft warns of 0-day attack hidden in slides
Might put out patch in update, might chuck it out sooner
Ubuntu 14.10 tries pulling a Steve Ballmer on cloudy offerings
Oi, Windows, centOS and openSUSE – behave, we're all friends here
Was ist das? Eine neue Suse Linux Enterprise? Ausgezeichnet!
Version 12 first major-number Suse release since 2009
prev story

Whitepapers

Choosing cloud Backup services
Demystify how you can address your data protection needs in your small- to medium-sized business and select the best online backup service to meet your needs.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
New hybrid storage solutions
Tackling data challenges through emerging hybrid storage solutions that enable optimum database performance whilst managing costs and increasingly large data stores.
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.