From Microsoft:

These white papers describe the performance and capacity impact of specific feature sets included in SharePoint Server 2010. These white papers include information about the performance and capacity characteristics of the feature and how it was tested by Microsoft, including:

• Test farm characteristics
• Test results
• Recommendations
• Troubleshooting performance and scalability

Go forth and download.

• Plan Governance
• SharePoint Governance Checklist Guide
• SharePoint Collaboration Service Governance Plan
• SharePoint Intranet Portal Governance White Paper
• SharePoint Deployment Guide and Checklists

This is of course only sampling of what’s available. Feel free to sound off in the comments with your go-to resources for SharePoint governance.

Sample Usage:

stsadm -o trimauditlog -date 20090101 -databasename MyContentDB

If you have auditing enabled and find yourself curious about the amount of space a particular table is consuming, the following script can help in finding the largest tables in a database:

/********************************************************************
*
*  BigTables.sql
*  Bill Graziano (SQLTeam.com)
*  graz@sqlteam.com
*  v1.1
*
********************************************************************/

declare @id	int
declare @type	character(2)
declare	@pages	int
declare @dbname sysname
declare @dbsize dec(15,0)
declare @bytesperpage	dec(15,0)
declare @pagesperMB		dec(15,0)

create table #spt_space
(
	objid		int null,
	rows		int null,
	reserved	dec(15) null,
	data		dec(15) null,
	indexp		dec(15) null,
	unused		dec(15) null
)

set nocount on

-- Create a cursor to loop through the user tables
declare c_tables cursor for
select	id
from	sysobjects
where	xtype = 'U'

open c_tables

fetch next from c_tables
into @id

while @@fetch_status = 0
begin

	/* Code from sp_spaceused */
	insert into #spt_space (objid, reserved)
		select objid = @id, sum(reserved)
			from sysindexes
				where indid in (0, 1, 255)
					and id = @id

	select @pages = sum(dpages)
			from sysindexes
				where indid < 2
					and id = @id
	select @pages = @pages + isnull(sum(used), 0)
		from sysindexes
			where indid = 255
				and id = @id
	update #spt_space
		set data = @pages
	where objid = @id

	/* index: sum(used) where indid in (0, 1, 255) - data */
	update #spt_space
		set indexp = (select sum(used)
				from sysindexes
				where indid in (0, 1, 255)
				and id = @id)
			    - data
		where objid = @id

	/* unused: sum(reserved) - sum(used) where indid in (0, 1, 255) */
	update #spt_space
		set unused = reserved
				- (select sum(used)
					from sysindexes
						where indid in (0, 1, 255)
						and id = @id)
		where objid = @id

	update #spt_space
		set rows = i.rows
			from sysindexes i
				where i.indid < 2
				and i.id = @id
				and objid = @id

	fetch next from c_tables
	into @id
end

select top 25
	Table_Name = (select left(name,25) from sysobjects where id = objid),
	rows = convert(char(11), rows),
	reserved_KB = ltrim(str(reserved * d.low / 1024.,15,0) + ' ' + 'KB'),
	data_KB = ltrim(str(data * d.low / 1024.,15,0) + ' ' + 'KB'),
	index_size_KB = ltrim(str(indexp * d.low / 1024.,15,0) + ' ' + 'KB'),
	unused_KB = ltrim(str(unused * d.low / 1024.,15,0) + ' ' + 'KB')

from 	#spt_space, master.dbo.spt_values d
where 	d.number = 1
and 	d.type = 'E'
order by reserved desc

drop table #spt_space
close c_tables
deallocate c_tables

Credit: Finding the biggest tables in a database

For more information, see Trimauditlog: Stsadm operation (Office SharePoint Server).

[Via To The SharePoint]