Question

Waittype PAGEIOLATCH_SH with a large waittime is degrading system performance

Asked by: Lexie

This morning system performance was degrading as the number of the system processes was exploding. Normally I have about 20 processes running on a database (master..sysprocesses), but in one hour it grew to 200. Wheb I checked the table I saw this:

spid   wait       waittime    lastwaittype       trans    status
54     0x0422   262937   PAGEIOLATCH_SH   0        sleeping   (about 140 of these)
61     0x0422    28304    PAGEIOLATCH_SH   2        sleeping   (about 20 of these)
66     0x0000            0   PAGELATCH_UP      2         runnable (2 of these)
88     0x0000            0   PAGEIOLATCH_EX   2         runnable (1 of these)
101   0x0424     28187   PAGEIOLATCH_EX   2         sleeping  (4 of these)

I restarted the server and the problem was solved. All the processes came from the .Net SqlClient Data Provider. Some of my SQL jobs got the following warning during that hour:

Executed as user: NETMATCH5\sqlserver. Time-out occurred while waiting for buffer latch type 2 for page (1:147380), database ID 10. [SQLSTATE 42000] (Error 845).  The step failed.

My questions are:
1. What do the waittype 0x0422 and 0x0424 mean? I looked on internet but could not find a list of waittypes.
2. What could the reason be, disk IO too much stress?

Regards, Lex van de Pol

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Asked On
2004-07-22 at 02:23:15ID21067417
Tags

pageiolatch_sh

Topic

MS SQL Server

Participating Experts
3
Points
50
Comments
5

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Answers

 

by: ram2098Posted on 2004-07-22 at 03:42:19ID: 11610888

Check the Site for different wait types.
http://sqldev.net/misc/WaitTypes.htm

This is a memory related issue and it happens when the memory consumption on SQL Server is too high.

 

by: LexiePosted on 2004-07-22 at 04:07:08ID: 11611063

I already have that one, I am looking for the meaning of 0x0422 and 0x0424.

I already found the course, the database file grew four times with 10% with a total of 7GByte. Very strange, as in the properties I can see that it has now 12GByte of free space.

So it was not the memory, but the disk IO. That's also stated in WaitTypes.htm:

PAGEIOLATCH_x

Short-term synchronization objects used to synchronize access to buffer pages. PageIOLatch is used for disk-to-memory transfers
 
If the wait is significant, it normally suggests disk I/O subsystem issues. Check PhysicalDisk counters.

Lex

 

by: mastooPosted on 2004-07-22 at 07:21:29ID: 11612545

I had similar errors.  While pondering their significance for a day, the RAID controller card died.  I don't know if this was coincidence or the errors were trying to warn me badness was about to happen.

 

by: SjoerdVerweijPosted on 2004-07-22 at 15:45:20ID: 11617507

This has happened to us when the disk fragmentation got out of hand. You might want to defrag the volume your data is on.

 

by: LexiePosted on 2004-07-23 at 05:59:36ID: 11620850

Ok, It turned out that because the file had grown 4 times 10% the defragmentation scheduler was taking a long time. And this probably was causing the Latch locks.

20120131-EE-VQP-002

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