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The Audit Log in MOSS has the potential to become unruly if left to it’s own devices. If you have upgraded to at least the Infrastructure Update, a new stsadm command is available for trimming the audit logs (specifically the AuditData table in the content database). The command is trimauditlog.

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).