This post is about an issue in OpsMgr SP1 AND R2 – where the localizedtext table in the database may fill and consume large amounts of space.
OpsMgr 2007 no longer has a hard database limit of 30GB like MOM 2005 did. For this reason, most OpsMgr administrators don't watch this very closely anymore, or freak out when it gets big.
However - it must be noted... console and operational performance are still impacted when this DB gets big. You really should keep an eye on it and try to keep it as small as possible. In general, I recommend only keep 2 days of operational data (Database Grooming global setting) from the default of 7 days, until everything is tuned.
One thing I have noticed at several locations, is that there are a couple tables that often grow quite large... depending on the agent count and what management packs are installed. These are LocalizedText and PublisherMessages. This is cause by management packs, that create a large amount of events, from script. I have seen this mostly in environments that have funky converted MOM 2005 MP's what run a lot of backwards-compatibility scripts, or in large Exchange 2007 and SCCM deployments. Like I said - this won't affect all customers... just those with specific management packs that expose this. What happens, is each event writes additional data to these tables, and they are not groomed or pruned.... so they keep growing. Over time, the impact is, that your DB might keep filling and run of of disk space, or your performance might be impacted when you use a view that queries LocalizedText.
* Am I impacted by this issue? *
To know if you are impacted - I would run the following query against your OpsDB:
Simple query to display large tables, to determine what is taking up space in the database:
8 * Sum(CASE WHEN si.indid IN (0, 1) THEN si.reserved END) AS data_kb,
Coalesce(8 * Sum(CASE WHEN si.indid NOT IN (0, 1, 255) THEN si.reserved END), 0) AS index_kb,
Coalesce(8 * Sum(CASE WHEN si.indid IN (255) THEN si.reserved END), 0) AS blob_kb
FROM dbo.sysobjects AS so JOIN dbo.sysindexes AS si ON (si.id = so.id)
WHERE 'U' = so.type GROUP BY so.name ORDER BY data_kb DESC
Normally, in most typical environments with typical MP's, we'd expect perf data to be the largest tables, followed by event, state, and alert. If localizedtext is your largest table, this is impacting you. You can run the following query:
select count(*) from localizedtext
Generally, if this table is your largest in the database, and over a million rows, you are impacted. The impact is low... however.... mostly just hogging space in the DB, and possibly impacting console performance.
* OK – I am impacted. What do I do? *
You need to run the attached SQL statements to clean this up. You might need to run these on a regular basis (once a week to once a month) if it grows back quickly. To run these – you open SQL Server Management Studio, connect to the SQL instance that hosts the OperationsManager DB, and run a “New Query”. Then paste the text from one of the scripts attached into the query window, and run it.
When you upgrade to R2 – most of this is resolved…. we no longer fill this table, however, you WILL need to run the cleanup at least once to get rid of all the old junk leftover from SP1 days.
***UPDATED for R2:
There are now TWO scripts.
If you are on SP1 – you run both on a regular basis.
If you are on R2 – you only need to run the LocalizedTextCleanupforSP1.txt script ONCE, and then run the LocalizedTextCleanupSP1andR2.txt script on a regular basis.
This core issue was fixed in R2, however – since R2 released we found another type of data that gets left in the LocalizedText table, so this second script was developed.
*** Critical Note:
These scripts will require a LARGE amount of TempDB (mostly TempDBLog) space - make sure your TempDB is on a volume with lots of space to grow... if not - add an additional TempDB file on another volume just in case. Make sure you take a good SQL backup of your OpsDB FIRST. The script in general, takes about 20 minutes per million rows in the LocalizedText table, depending on the hardware capabilities of the SQL server. I have seen it take 10 minutes per million rows on a fast server.
Now – when I say LOTS of space for your tempDB – I mean it. LOTS. I believe it is the tempDBlog that needs most of the space. Just make sure you have at least as much tempDB space as the size of your LocalizedText table. That means if your LT table is 40 million rows (~40GB) then I would plan to have at LEAST 40GB of free space for your TempDB/TempDBLog to grow. Changing the default autogrow on these to a larger value, and growing them out in advance will help speed up the process as well.
When the script is done, you wont recognize the space freed up immediately. You need to run a - DBCC DBREINDEX ('localizedtext') - to reindex the table, and show the newly freed space. It would likely be a good idea to reindex the entire database at this point, which you can do by running the following:
Reindex the database:
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
SET ARITHABORT ON
SET CONCAT_NULL_YIELDS_NULL ON
SET QUOTED_IDENTIFIER ON
SET NUMERIC_ROUNDABORT OFF
EXEC SP_MSForEachTable "Print 'Reindexing '+'?' DBCC DBREINDEX ('?')"
If you first want to troubleshoot, and try and determine what is consuming your tables... or which MP's are generating the most noise in this table.... you can run the following (they might take a LONG time to complete - depending on how big your tables are:
Most common events:
select messageid, ltvalue, count(*) as Count from publishermessages with(nolock)
inner join localizedtext with(nolock)
on messagestringId = localizedtext.ltstringid
group by messageid, ltvalue
order by Count DESC
LT insertions per day/month:
DATEPART(mm,timeadded) AS 'MONTH',
DATEPART(dd,timeadded) AS 'DAY',
from localizedtext with(nolock)