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Questions tagged [wait-types]

Whenever the server is running queries, it’s tracking how much time it spends waiting on bottlenecks. These wait statistics are the easiest way to identify your bottleneck.

4
votes
1answer
12k views

resource wait SQLCLR - wait_type CLR_SEMAPHORE by SPID 0

UPDATE In the comments under Aaron's post is an extensive explanation why I want to find this out, please read it if you want to know. The system is running some ETL, reporting services and a ...
33
votes
1answer
30k views

SLEEP_TASK Wait Type in SQL Server - What does it indicate?

I haven't seen the SLEEP_TASK wait type before, and today I seem to be getting a ton of them. I'm not the official DBA, just a SQL Server developer who knows some DBA stuff. We upgraded our servers ...
5
votes
1answer
5k views

What is the Wait Type “QDS_Shutdown_Queue” referring to?

I'm gathering wait types on a load test environment, and the second biggest wait type is QDS_SHUTDOWN_QUEUE. The stats are coming from sys.dm_os_wait_stats, but I can't find any documentation that ...
3
votes
2answers
8k views

CXPACKET SUSPENDED and NULL wait type

I was was running the query in this article: http://sqlity.net/en/708/why-cxpacket-waits-are-not-your-performance-problem/ To see what my threads were waiting on in regards to a suspended query with ...
16
votes
1answer
21k views

Is ASYNC_NETWORK_IO wait type anything to worry about?

In looking at the list of stored procedures that take long time to execute, one stands out as causing the most wait. However, most of that wait (81%) is ASYNC_NETWORK_IO and I know why: the stored ...
8
votes
2answers
2k views

SQL Server performance: PREEMPTIVE_OS_DELETESECURITYCONTEXT dominant wait type

I received a call yesterday from a customer who was complaining about high CPU usage on their SQL Server. We're using SQL Server 2012 64 bit SE. Server is running Windows Server 2008 R2 Standard, 2.20 ...
6
votes
1answer
896 views

Attempting to tune a Sharepoint site using SQL Server Waits and Queues

I'm pretty new to this performance tuning with Waits and Queues thing - fascinating, but also not always all that intuitive... Right now, a customer of mine has a SQL Server 2008 64-bit Enterprise ...
5
votes
1answer
2k views

Is the SQLTRACE_FILE_BUFFER wait type documented? What does it indicate?

We run a background task on one of our servers which polls sys.dm_exec_requests for long-running queries, gathering diagnostic information when it finds them, including wait type. I'm seeing a number ...
2
votes
1answer
223 views

How can I reduce OLEDB wait type in a SSAS linked server connection?

I have recently created a linked server to one of my SSAS servers. when I go ahead and open the catalogs, to see which ssas databases I have there, I use the following procedure: create procedure ...
1
vote
1answer
951 views

sql server service broker

For the last few days the service broker command which run from master database is consuming much more RESOURCES than before. The Impact on the Database is high (from the bad side), It causes for ...