How to Modify Database Capacity Settings in SharePoint 2010?

Microsoft has come up with the following benchmarks, beyond which performance suffers.

Content db Recommended Default
Site Collection in Single Content db 10000 15000

Navigate to Central Administration and then Application Management

Central Administration> Application Management
Click on Manage Content databases Under Databases
Click on Database Name On which you want to modify capacity setting.

Modify the Maximum Number of Site per Content db. (15000 to 10000)

According to Microsoft, you can have up to 50,000 Site Collections in a single web application. The bigger question I think you should be asking yourself is, how many Site Collections do you want to put in any single content database? When you look at SharePoint from a recovery perspective it is important to limit the size of your content databases so that you can manage your backups and restores. Each Site Collection can only reside in a single content database, though you can have any number of collections in a content db. So, while I can have 50,000 collections in my web app, how many content databases will that be and how many of those collections will be in each db?

Microsoft also recommends no more than 100 content databases per Web app. So, let’s assume you don’t want databases larger than 100 GB , and your site collections had an average of 10GB quotas – you could have 10 site collections per content database (not including 2nd stage Recycle Bin) Using some simple math and introducing a reality check, that’s actually about 1,000 site collections per Web app.

Ref: SharePoint 2010 Performance and Capacity Planning

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