Causes For Latch Wait Time

Jan 6, 2008

I setup a SQL Agent to send me an email when the Average Latch Wait Time is greater than 300ms. Now I receive an email every 15 seconds stating that the current ALWT is 3916ms. That value never changes with the emails. However, the perfmon shows nothing at all (shows zero).

I also have a Buffer cache hit ratio of 2848.00.

These numbers are when there is NOBODY on the DB at all It is just sitting there. When I reboot the server, as soon as SQL starts it starts to send the emails again.

Server: Intel Xeon Quad Core 2.66
RAM: 4GB (with /3GB in the boot.ini)
RAID 1: Data (DB and logs)
CPU Utilization: 0-1%
RAM Utilization: 527MB
OS: Server 2003 R2 With SP2
SQL: 2005 Standard with SP2

How can I determine if the ALWT is really 3916?

I executed 'Select * from sysprocesses where SPID>50 and waittime>0'

Which showed;

program_name=DatabaseMail90 - Id<3780>

Any assistance is greatly appreciated.

Thank You


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Latch Time

May 14, 2004

Hi All,

This might be a bit of a question like "how long is a peice of string" however here goes.....

What is considered to be a high average latch time?

We have a SQL2000 machine which has:
700-900 ms average latch time
100% Buffer Cache Hit Ratio
No memory pages / second
Very low (almost always below 5%) cpu usage
Next to no disk transfers / sec
0 average lock time

I am surprised that the latch time is so high. Any ideas, whether I should be looking at something in particular?

Cheers in advance.

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WARNING: EC 259683c0, 0 Waited 32100 Sec. On Latch 807133b0. Not A BUF Latch.

Apr 7, 2004

During a bulk insert I am receiving this error message in the sql log. It appears to have caused the server to reboot the other night..

I am running SQL 2000 8.00.760 (Service Pack 3)

2004-04-07 12:57:52.82 spid8 WARNING: EC 259683c0, 0 waited 32100 sec. on latch 807133b0. Not a BUF latch.
2004-04-07 12:57:52.82 spid8 Waiting for type 0x4, current count 0xa, current owning EC 0x70899570.

Any ideas???



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DBCC execution completed. If DBCC printed error messages, contact your system administrator.

Please could you tell me how to fix it, and how it occurred in the first place?


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Aug 23, 2004

Hi Guys,

One of your SQLSERVER 7, Server throws the below error message into the log file. It won't go away until the server get rebooted. When this error start showing up.. customers have hard time connecting to the Server, eventually we have to reboot the server.

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Any help is greatly appericated.


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Jul 20, 2005

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I am currently investigating aa high avg write time ms issue (145ms) which seems to be only occuring on the tempdb data files.I have followed the recommended setup of TEMPDB in that

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2. Data files and logfiles are on separate partitions away from the other databases.
3. Tempdb is presized and no incremental file increases look like they are happening with frequency.

We have sharepoint 2012 setup on other sql servers and with TEMPDB setup following the same guidelines, with far more Sharepoint activity on a similary specified hardware which is why its confusing.FileIO auditing on the partitions themselves shows that the FileIO is very fast on the partitions that the tempdb data file which leads me to beleive that Sharepoint may be the culprit perhaps due to excess use of tempdb with operations taking a long time to resolve.

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Nov 1, 1999

I have been looking at Books Online and I'm trying to figure out how I can resolve this error.

MSG 845, Level 17, State 1
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Jun 15, 2004

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What does this mean any reason and fix for it..?


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Jul 20, 2005

Does anybody know what might cause the following message to show up inthe SQL Server Error Log?:Time out occurred while waiting for buffer latch type 2, bp0x12260f80, page (5:77914), stat 0x40d, object ID 7:421576540:0,waittime 500. Continuing to wait.I've read several articles about what to do about this situation onSQL Server 2000, but I'm running SQL Server 7.0. Specifically, I'mrunning version 7.00.842. Is there a way to resolve this problemwithout upgrading to some flavor of SQL Server 2000?

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Dec 6, 2007


we''re currently performing a dry run of migrating some large (100GB+) SQL Server 2000 databases from a SQL 2000 cluster onto a new 2005 mirrorred database pair. The new configuration has completely separate database servers and a new dedicated SAN.

Upon restoring our largest database we are seeing the following errors recorded in the log after setting up mirroring and then trying to run DBCC CHECKDB:

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We are currently investigating the SAN hardware logs to determine if this might be a physical issue as it would seem to indicate, however has anyone any experience of this or insight into what may cause this error?

Thanks in advance!

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Sep 21, 2007


Is it possible to generate a script, that extracts every bit of data it can, from tables which suffers from latch errors;

Msg 7985, Level 16, State 2, Line 1

System table pre-checks: Object ID 4. Could not read and latch page (1:403) with latch type SH. Check statement terminated due to unrepairable error.

So bad news on that one. There are no backup available that I know off, so all bets are off on that part of the recovery process.

The "good news" part of the problem, is that it is possible to extract some data out of the table, before SQL server 2005 returns the error. So what I want to do, is get every bit out I can, doing it somehow automatically, so I don't have to run bcp on 180 tables :).

Presumeably, this is quite possible, but how?

NB. If I do a complete basic SELECT * FROM tbl1, it returns data, then errors out, but what about the data after the last row SELECT returns? Is it possible, that there might be data in the table that are recoverable after the 'broken row(s)'?

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I am getting below error while executing any SQL query on database server.

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There is currently some space issue on the server, so by any chance this space issue is causing this error?

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Aug 1, 2000

I am running into problems while running a large procedure, and i think it may have something to do with a PAGEIOLATCH_SH wait problem.
My server, whose sole purpose is to run this one procedure, is doing plenty of disk i/o, and the CPU’s bouncing around, so I assume it’s working. But when I look at its process info, it seems to be sleeping a lot of the time on PAGEIOLATCH_SH. No other users are in the DB, so I'm quite confused. I don't find much info on this anywhere, so any insight would be very appreciated.

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Jan 15, 2008

I'm new to SQL Sever 2005 and I'm trying to do what Informatica (Power Center - ETL) is trying does.

I have created a work flow and it is scheduled to run at every night 1:00 AM .The process is to load a flat file ( into the database from a shared location.The flat file is transfered from a 3rd party and once the file transfer is complete it will create a indicator file (0 byte eg: CRV.DONE file) which indicates the transfer is complete.

In my workflow I will be waiting for the CRV.DONE indicator file and once it is avaiable I will start loading the and once the load is completed I will delete CRV.DONE file and be ready for the next day load.

Please let me know if there is any way in SQL Server 2005 to achieve it.Thanks

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Jun 11, 2007

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In many cases the client does not need a response provided the message is queued and will eventually get delivered. However, in some cases the client would like to wait for the message to be processed before proceeding. Is there an easy way to both submit and optionally wait for a response - with data - in a single stored procedure? If client does not want to continue to wait, is there a way to use a procedure to check for the returned message later?

We have not used Service Broker before and are doing for a "sanity" check before proceeding. We do not want to tightly couple the two databases at this time.

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Dec 11, 2007

I have installed performance dashboard on 2 different servers. The first server have User Session CPU Time 71% and Wait Time =28%, The other server have Cpu Time of 20% and Wait Time of 79%. Have I understand that stands in SQL Server Waits And Queues that I have some typ of wait problem in my second server?

Then I tries to run this

'%signal waits' = cast(100.0 * sum(signal_wait_time_ms) / sum (wait_time_ms) as numeric(20,2)),
'%resource waits'= cast(100.0 * sum(wait_time_ms - signal_wait_time_ms) / sum (wait_time_ms) as numeric(20,2))
From sys.dm_os_wait_stats

First Server
%signal waits %resource waits
--------------------------------------- ----------------------------
0.07 99.93
Second Server
%signal waits %resource waits
--------------------------------------- ----------------------------
0.12 99.88

Messy in my head€¦ Help please

My second server have

CLR with 50% in the historial wait. Rest in Sleep

My first server have
99% in sleep wait category.

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Sep 28, 2015

I am running a DBCC SHRINKFILE on "FILE1" of a database (it has fileid = 1)...intent is to remove 70GB of file space:


For the SPID that's doing the shrink, In activity monitor you can see:

Waittype: PAGEIOLATCH_EX on resource: 9:3:15411328
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But why does it need a page from fileid=3? Are there page dependencies between files that prevent moving a page within a given file? Does it need that fileid3 page to come along?

Its just sitting there in the SUSPENDED state for the last hour....I am going to leave it another 5 hours or so before cancelling.

The dm_exec_requests has an estimated percent complete at 83% and holding....not sure if I can believe that.

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Sep 30, 2004

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I changed the statement into update [...] set col = null; sysprocesses shows one row with PAGEIOLATCH_SH. Executing forever.

I checked other processes including those outside sqlserver but none are using the db, let alone accessing the table involved. Even restarted sqlserver to be sure there's no dead process blocking the update. Didn't help.

So I added a search condition to the where-clause, involving a clustered index in order to reduce the rowcount. The execution plan shows a 97% hit on the clustered index, but sysprocesses shows the three rows again...

So far the profiler didn't help me out either: there's a SP: CacheInsert on the update-statement... then nothing.

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