Causes For Latch Wait Time

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: OS
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;

BROKER_RECEIVE_WAITFOR
waittime=110640ms
waittype=0x0075
status=suspended
program_name=DatabaseMail90 - Id<3780>

Any assistance is greatly appreciated.


Thank You

Magnum



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Latch Time

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.
Troy

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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???

Thanks

Scott

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just wondering what are the values on your SQL servers for these counters:

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We set up two servers, both are quad machines (4 cpus) with SANs devices as a HD space (RAID5) that operate via fiberchanels (can't be faster).
Both server have 4 Gb of RAM. Both have SQL2000 Ent and Win2000 Advance Server. The only difference between them is that the first one is clustered the second one is not, so.

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Latch Waits/sec - 62.065

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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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'%signal waits' = cast(100.0 * sum(signal_wait_time_ms) / sum (wait_time_ms) as numeric(20,2)),
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--------------------------------------- ----------------------------
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Second Server
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My second server have

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