Contents
Why is pagelatch _ ex Waits and heavy inserts?
Using DBCC PAGE, we can see that the object id is 60, which is the sysobjvalues system table. This table is used to hold metadata while accessing the sequence to get the current value. So it seems that we are not incurring in PAGELATCH_EX waits in the data insertion itself, but while getting the next value for the sequence.
How to resolve pagelatch _ ex contention in SQL Server?
This article introduces how to resolve last-page insert PAGELATCH_EX contention in SQL Server. Consider the following scenarios: You have a column that includes sequential values, such as an Identity column or a DateTime column, that is being inserted through the Getdate () function.
What happens if I run pagelatch _ ex diagnostic query?
In this situation, you may experience a decrease in performance of your application. When you examine wait types in sys.dm_exec_requests, you observe waits on the PAGELATCH_EX wait type and many sessions that are waiting on this wait type. Another issue occurs if you run the following diagnostic query on your system:
What are the benefits of multi statement table valued functions?
Now we will join Production.ScrapReason to UdfGetProductsScrapStatusbyID through the CROSS APPLY operator. The main benefit of the multi-statement table-valued functions enables us to modify the return/output table in the function body so that we can generate more complicated resultset.
What does pagelatch _ ex mean in SQL Server?
Table/index insert hotspot ( PAGELATCH_EX for threads inserting onto the same page and possibly PAGELATCH_SH for threads reading from that page) Excessive page splits from random inserts ( PAGELATCH_EX for threads trying to insert/update rows on a page and possibly PAGELATCH_SH for threads reading from that page)
When to use a pagelatch vs pageiolatch?
In a nutshell, a PAGELATCH is used to synchronize short term access to database pages that reside in the Buffer cache, as opposed to a PAGEIOLATCH, which is used to synchronize physical access to pages in disk. These are normal in every system, the problem being when there is contention.