Wait Type: NETWORKIO
Jan 14, 2005
I have an ASP.NET web application that hangs on a single database UPDATE command for 5+ minutes. I can see this occur in SQL Profiler. This is a one row UPDATE statement on a small table (~600 rows). There are no JOINs or sub queries. There are no other users using the system. During this 5+ minutes, I can see the job in Enterprise Manager with a wait type of NETWORKIO. Since both IIS And SQL Server are running on the same system, the network shouldn't be an issue. Any ideas?
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Sep 29, 2006
Hello, my first post??
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Mar 28, 2007
Recently we observed a problem. We are running stored procedure through our c# code. Three machines access the server and update or insert in the required tables in the server. If there is no data in the server, on installing first time our application usually our database is clean. then stored procedure works fine, it takes around 10 to 15 sec to execute. Next time if execute the time goes up to minutes like 15 mins. Next time it goes for hours around 4 hrs. Even to update 4 or 5 records it takes time. Initially we thought it was because of the size of the data and we tried to re tune on indexes, it did not solve. But now what we observe is even with less number of records in server also it wouldn't come of the execution for hours.
Now are executing the just the SP in the SQL manager studio to see the time. That one also is executing for hours. when looked at the activity monitor the process goes to suspend state with wait type ASYNC_NETWORK_IO.
When we comment one of the query is working fine.
Is this something to do with the query I am not sure. If that is the case it should not work every time.
The query makes any sence or is there any way to write it in better way
'UPDATE [server].[dbo].[DocumentMetadata] SET DocumentInfoID = b.DocumentInfoID, [Name] = b.[Name], MetadataType = b.MetadataType,
[Value] = b.[Value], ValueType = b.ValueType
FROM [server].[dbo].[DocumentMetadata] a WITH (UPDLOCK)
INNER JOIN (SELECT c.DocumentInfoID, c.[Name], c.MetadataType, c.[Value], c.ValueType
FROM MACHINENAME.[Client].[dbo].[DocumentMetadata] c
INNER JOIN MACHINENAME.[Client].dbo.DocumentInfo DINF ON c.DocumentInfoID = DINF.DocumentInfoID
INNER JOIN MACHINENAME.[Client].dbo.Path d on DINF.NativeFileID = d.PathID
INNER JOIN MACHINENAME.[Client].dbo.ActiveDataSource ADS ON d.DataSourceID = ADS.DataSourceID
WHERE ADS.ProjectID = ''' + @ProjID + ''') b
ON a.DocumentInfoID = b.DocumentInfoID AND a.[Name] = b.[Name]'
'INSERT INTO [server].[dbo].[DocumentMetadata]
(DocumentInfoID, [Name], MetadataType, [Value], ValueType)
SELECT c.DocumentInfoID, c.[Name], c.MetadataType, c.[Value], c.ValueType
FROM MACHINENAME.[Client].[dbo].[DocumentMetadata] c
INNER JOIN MACHINENAME.[Client].dbo.DocumentInfo DINF ON c.DocumentInfoID = DINF.DocumentInfoID
INNER JOIN MACHINENAME.[Client].dbo.Path d on DINF.NativeFileID = d.PathID
INNER JOIN MYCLI.[Client].dbo.ActiveDataSource ADS ON d.DataSourceID = ADS.DataSourceID
WHERE ADS.ProjectID = ''' + @ProjID + '''
AND Ltrim(rtrim(c.DocumentInfoID))+ ltrim(rtrim(c.[Name])) NOT IN
(SELECT Ltrim(rtrim(DocumentInfoID))+ ltrim(rtrim([Name])) FROM [server].[dbo].[DocumentMetadata])'
We have been fighting it out for so many days.
Can anybody help
Thanks
knvdssr
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Oct 29, 2015
This is the scenario in my environment
WaitType Wait_Sec Resource_Sec Signal_Sec Wait Count Wait Percentage
WRITELOG920039.89887485.89 32554.00 23446032975.02
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Sep 4, 2015
During our DR drill we found that the same code which used to run perfectly fine on our Primary Data Centre is running very slow on Disaster Recovery DB Server and there are Lot's of open transaction with sleeping status and waittype as 'AWAITING COMMAND'.CPU, Memory and disk utilization are good. The ping reply between the app server and the DB server is well within the limit's even blocking is not their, also nothing is reported in the error logs. We are using SQL server 2014 STD 64 BIT on Windows Server 2012.
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Oct 21, 2004
I have a server with 300Gb+ of disk space on a SAN, with a database 55Gb for data and 15Gb for tranx log. SQL Server 2000 w/SP3 is installed. Whenever I run any query (simple, complex, short, long, using indexes or not) the server current activity shows many instances of NETWORKIO, PAGELATCH_EX, CXPACKET and other wait types on several processes. In Profiler, 500,000+ events were recorded within a 60 second timeframe. Someone else is responsible for "infrastructure" so before I go with recommendations to fix my issues, I would like as much accurate info as possible about the cause. This is supposed to be a relatively low-activity server. My understanding is serious disk subsystem issues would cause all these wait types together. But why would this happen when running a "select x, y, z from table" where the table contains < 250000 records and x,y,z make up a covering index. Additionally, I ran a relatively simple query, two tables, inner join, with properly defined indexes and went home to let it run. I returned and it had been running for 18 hours - I finally ran out of patience and stopped it. Any ideas?
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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 (CRV.data) 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 CRV.data 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 CRV.data 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
Hi. We are migrating a mainframe datacom database to SQL Server. One of our client-server applications already uses SQL Server. This application uses a middleware product to query and update the datacom database being migrated. We are considering using Service Broker to replace the middleware.
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
Select
'%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 30, 2004
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.
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.
What should I do?
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Aug 31, 2006
I'm writing a small vbscript to backup a db and some related files, so I used a WSShell calling OSQL to run a Sql BACKUP command, then after it's finished I XCOPY the resulting file plus some other related files. But the problem is that OSQL ends it's execution as soon as the BACKUP command is sent to SqlServer, not when the backup itself ends.
Anyone knows how to synchronize the two? How to wait, inside OSLQ, for the end of the BACKUP execution?
TIA
Luigi
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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: 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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Jul 20, 2005
Oracle has a 'wait interface' for monitoring bottlenecks, etc... does SQLServer have utilities like this?
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Feb 1, 2007
Hi,
I have a data-flow-task that imports data to sqlserver.
Now I want to check, if a special column of an imported record is null.
If yes, I have to wait 10 minutes and jump to the data-flow-task again. (Cjeck and wait).
How can I do this with the integration services?
Thanks
Gerd
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Mar 7, 2008
We have a few SSIS jobs that we are currently manually kicking off after we are sure that certain AS400 jobs have run. We want to completely automate this process, so that we don't have to babysit. What is the most efficient way to do this? In the past (on SQL Server 7 no less) I've seen the 400 job setting a flag to 'Y' in a 400 file, FTPing it down to a flat file, and then the SQL job running every five minutes checking the flag. When it was 'Y', the SQL job would run. We do not have the option of using FTP here. Any suggestions would be appreciated! After the job runs, we'd like it to kick off a report as well
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May 16, 2008
So, I'm fairly new to SQL, and I'm working with a SQL2k5 Database with pre-made packages and what-not. This database was setup before I started this job, and now I'm trying to improve part of the processing in SQL, and so far so good, but I can't figure a couple things out.
The main problem is when I start a SQL command to launch a DTS package from a .sql file, how can I make it wait for the package to complete or fail before moving onto the next part of the .sql script? Hope it's a simple question, I've just taught myself enough SQL to get by in a couple of weeks.
Thanks!
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Dec 14, 2007
I am tring to fiqure out how i can run a TSQL and the have it start again 60 sec after it compleats, without me have to push the button. I just need it to loop over and over until my data is deleted. I have to do it this way so my site will still allow customers to login and I need the break so they can. Any help would be great.
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Jul 5, 2007
are there any tasks in SSIS that watches a folder and waits for incoming files?
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Jun 8, 2006
I have re-initialize some subscription. After generated snapshot successfully, the synchronization view showing 'The process is running and is waiting for a response from the server.' and I found the replication process is under 'async_network_io wait'. The job has run for more than 8 hrs. Any idea to improve it? Thanks in advaise.
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Apr 11, 2007
Good morning,
I will start off with the default warning message: I am a beginner. That said, I have an SSIS process that calls an external executable to transform a data file through a homegrown C program. (This will eventually be converted, but for the moment needs to remain.) The end of the run creates a *.done file. How do I use the SSIS tasks to pause/wait, checking periodically, for the existence of this file before continuing with processing tasks? I apologize if this is easy, but I am stumped.
Thanks in advance,
Roger
Info:
SQL 2005
Microsoft SQL Server Integration Services Designer
Version 9.00.3042.00
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Feb 9, 2001
When I run some of the quiries, in current activity, wait type would say:
PAGEIOLATCH_SH what does it means ? Is there a source I can see all
types of wait types ?
Help is much appreciated.
Thanks,
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Oct 3, 2014
I keep getting an alert from a Third-Party Tool stating my server is reporting failed components with the following message
Components Reporting Problems:
Average Lock Wait Time(ms)(Critical)
When I look at sp_who2 or sp_lock I don't see anything blocking processes or anything else out of the ordinary.
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Jul 24, 2007
CXPACKET wait type current makes up 63% of all the wait types which is causing latency. I need to identify the specific workloads responsible for waits so I can optimise or MAXDOP them. I already know how to retreived the top IO, CPU, Memory consuming queries but how do I identify the statements and order them by wait time?
Can someone point me in the direction of a command, DMV or will the top CPU list be adequate?
Thanks
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Dec 13, 2006
Hello,
It seems strange to me that once the UNION ALL component waits for at least one row from each input buffer before it puts anything into the output buffer (that's the behaviour that I have observed anyway).
Why does it do that?
Thanks
-Jamie
[SSIS Team Followup]
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Oct 5, 2015
I would like to know what a particular session is waiting on (cpu, io, memory etc).
For that I try to figure out how to use extended events. I would prefer to avoid the use files written to db-server, why I tried "histogram target".
Well my attempt does not produce usefull output,
-- check current event sessions
SELECT a.name,
CASE WHEN b.name IS NOT NULL
THEN 'Started'
ELSE 'Stopped'
END AS current_state
[Code] ....
The intention was to get a pareto chart, to see the top wait events in the session. I would also like to see amount of cpu used. Based on this tuning effort could be prioritized.
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May 13, 2008
OK, I know this is out there all over and yes I did a search for this topic; however, I am confused about tables with an image data type and with moving text file group to another filegroup.
Here is what I have:
I have a table storing imaged documents and has become very large. I want to move the table to another filegroup. The table is created like this:
USE [PD51_Data]
GO
/****** Object: Table [dbo].[SCANNEDDOCUMENTS] Script Date: 05/13/2008 14:52:40 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[SCANNEDDOCUMENTS](
[DocID] [int] IDENTITY(1,1) NOT NULL,
[CaseID] [int] NOT NULL,
[DocName] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[Doc] [image] NOT NULL,
[DocLocation] [varchar](255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[DocNotes] [text] COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
[TopicID] [int] NULL,
[ScannedDocumentsCheckSum] [varchar](128) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,PRIMARY KEY CLUSTERED
(
[DocID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[SCANNEDDOCUMENTS] WITH NOCHECK ADD CONSTRAINT [ISCANNEDDOCUMENTS2] FOREIGN KEY([TopicID])
REFERENCES [dbo].[TOPICS] ([TopicID])
GO
ALTER TABLE [dbo].[SCANNEDDOCUMENTS] CHECK CONSTRAINT [ISCANNEDDOCUMENTS2]
On a test DB, I moved the clustered and nonclustered indexes to a secondary filegroup no problem, but it still shows to be stored in the primary filegroup. I read an article about having to create a new table in the secondary in order to move the images and text file group. Has anyone come across this?
Do I need to drop the clustered index and FK to move to a secondary filegroup?
Or
Do I create a new table into the secondary filegroup and then add the Clustered index and constraints?
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Aug 4, 2015
For one of our SQL server 2005 Ent edition 64 bit SP4 which has transnational replication set up and used for heavy reporting, i was trying to counter out the performance of slow running queries which basically runs and get suspended and most often are seeing waiting:So i tried to analyse the wait stats and come up with below stats where ASYNC_NETWORK_IO dominated for a collection of two weeks data.
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Mar 10, 2008
Hello,
I'm hoping someone can clarify what I am seeing below:
I have a SQL Server which the 2nd top wait state according to the SQL Server 2005 SP2 dashboard is "CLR_Auto_Event" and "CLR_Manual_Event". This server dosen't have CLR Integration enabled in "Surface Area Configuration", and we do not have any CLR applications. I've checked this dashboard many times and CLR never appeared before, and nothing has changed on the server interms of new databases, and we don't host any applications on the server. I ran a short profiler trace and didn't see any CLR Assembly Loads.
Is there something I'm missing....?
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Apr 6, 2001
Here's my dilema, I want to run a stored procedure that starts another stored procedure running, but does not wait for the stored procedure to complete execution.
The stored procedure should execute immediately, and leave the other procedure to complete running in the background. Is there any way to do this?
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Sep 20, 2005
Is there a way to execute a stored procedure and have it move on without waiting for a response from the stored procedure. I am trying to create a button on a webpage that will execute a stored procedure but the procedure takes to long to run and my page times out. Instead I would like the button to start the procedure and the webpage look at a table of data. When the table of data is empty then I will know the stored procedure is complete. Is this possible?
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Mar 2, 2008
hi.
I have a question. I work in BI (with sql server 2000) and this year (2008) my idea is migrate to 2005, but, consulting to expert in Microsoft technology, they suggested wait to 2008, sql 2005 have many problem, sql server 2008 was completed re-write.
The question is, what problem have sql server 2005?
TIA.
Abel.
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Jul 20, 2005
Hello all,I've got a query which suddently became very slow. It now takes about 10secs instead of 2 secs.I've got to identical DB (one is for test and the other is production). Thequery is slow only in production.When running this query in both DB and looking at execution plan,statistics, etc, the onle difference is the Cumulative wait time on serverreplies.In test DB, I get the value: 2200And in production DB: 1.22344e+009What does this mean concretly? What do I have to do to solve this problem?TIA.YannickPS I'm using SS2000 SP3 on NT4.0
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