PAGEIOLATCH_SH Wait

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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Performance - PAGEIOLATCH_SH

Mar 30, 2007

Hi,

I need to delete data which is older than a year from a table which contains 54 million rows (yes i know, ridiculous isn't it).
I am using the below query:

DELETE tblLineCard
WHERE CreateDT <= dateadd(yy,-1,getdate())

It worked fine for the smaller tables, but shortly after starting up the above query it starts blocking itself (ie. it shows: SPID 55(Blocked by 55), under current activity in EM), goes into sleeping status and and has a wait type of PAGEIOLATCH_SH.
There are NO other queries taking place.
The transaction log keeps on growing and Query analyzer shows the "Executing Query Batch" message.

Any ideas? I have killed the process and restarted but same scenario each time. Your help would be wonderful.
Yours sincerely
SQLJunior...

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Question Regarding Slow Performance An PAGEIOLATCH_SH Locks On Sql2005

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Hi,I wondered in anyone can help with the following problem that i'mexperiencing, i'll try to provide as much info as possible and anysuggestions would be appreciated.I have just started at an organsiation and there seems to be slowperformance maybe on the san on a 64bit itanium dual core machine. 4CPUs are being showed to sql server, it also has 16gb of RAM. I'llstart with the configuration of the SAN.After speaking to the SAN guy, rather than carve the SAN up intodifferent area's for san Logs/Data etc they have gone for the approachof spreading a Vdisk across as many spindles as possible (All 145 ofthem). So the area that is presented to the SQL Server according thethe SAN guys is a vraid 5 stripe made up of all 145 disks which areall 72gb fibre-channel disks.This storage is not just made available to sql server but also madeavailable to other apps as well that need storage. Having read themanufactres best practice on setting this up there is a valid argumentfor doing this.The bandwidth from the SAN is 2Gb fibre, with each computer that usesthe SAN having 2Gb fibre cards.Clearly, that could act as a bottle-neck. But, there's nothing thatcan be done about it according to the SAN guy.Needless to say, any changes on the SAN are pretty much going to beout of the question as far as he's concerned but i think performanceisn't that good for the type of box they have and the SAN its attachedto.The 2nd thing i'll explain is the setup of the database in question,firstly whoever set it up split the database into 16 different file of4 filegroups so the table that i'm selecting to is in one filegroupsplit over 4 files and the the table selecting from is in anotherfilegroup made up of another 4 files. These are placed on the samephysical disk made up of the SAN LUN with 145 spindles.Anyway when i do a select from a sales table which has various groupbys and then insert the results into a blank table with no indexes itcan take over 2hours for 200k rows which i find very slow.When i look at the sysprocesses table i am getting various waits asfollows :-72427200x0042900PAGEIOLATCH_SH 6:9:219209472427200x00690SLEEP_TASK72427200x00000SOS_SCHEDULER_YIELDThe process seams to be going inbetween a PAGEIOLATCH andSOS_SCHEDULER_YIELD a few times per second.Running the following to get io stalls gives the following :-Select * from sys.dm_io_virtual_file_stats (6,7)Select * from sys.dm_io_virtual_file_stats (6,8)Select * from sys.dm_io_virtual_file_stats (6,9)Select * from sys.dm_io_virtual_file_stats (6,10)gives results like :-67170853985015624218246512844829457222526431245540454412438340307010565449074954240x0000000000000954It worries me that when the process is on the PAGEIOLATCH the waitcan be over 1000. Is it normal for the wait to be this long and whatwould be the best way to prove one way or another if the configurationof the san is causing this kind of performance???Thanks for any suggestions in advanceIan.

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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
Select

'%signal waits' = cast(100.0 * sum(signal_wait_time_ms) / sum (wait_time_ms) as numeric(20,2)),
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First Server
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--------------------------------------- ----------------------------
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Second Server
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--------------------------------------- ----------------------------
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Messy in my head€¦ Help please

My second server have

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

My first server have
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I'm doing an update on a table with about 113m rows, the update-statement is fairly simple: update tab set col = null where col is not null.
The col column is mostly null.

Sysprocesses shows three rows for this statement: 1 CXPACKET (its a dual processor, 2000 box with sp3 installed), 2 PAGEIOLATCH_SH (waitresource is filled). My guess would be that the where-clause is executed in a seperate process blocking the update.

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

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Thank You

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