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What does wait mean in SQL Server pageiolatch?
This wait type is when a thread is waiting for the read of a data file page from disk to complete, and the thread is going to modify the page structure once it is in memory (EX = EXclusive mode). The Latches Whitepaper in the sidebar on the right has a description of all latch modes and their compatibility with other latch modes.
What does pageiolatch _ ex mean in SQL Server?
PAGEIOLATCH_EX. This wait type is when a thread is waiting for the read of a data file page from disk to complete, and the thread is going to modify the page structure once it is in memory (EX = EXclusive mode). The Latches Whitepaper in the sidebar on the right has a description of all latch modes and their compatibility with other latch modes.
Why is there a pagelatch _ ex wait type?
This allows multiple sessions to do the INSERT operations against the same table concurrently. 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.
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:
This wait type is when a thread is waiting for the read of a data file page from disk to complete, and the thread is going to read (not modify) the page structure once it is in memory (SH = SHare mode). The Latches Whitepaper in the sidebar on the right has a description of all latch modes and their compatibility with other latch modes.
What does pageiolatch _ SH mean in SQL Server?
PAGEIOLATCH_SH. Description: This wait type is when a thread is waiting for the read of a data file page from disk to complete, and the thread is going to read (not modify) the page structure once it is in memory (SH = SHare mode).
What causes excessive pageiolatch _ SH wait type?
PAGEIOLATCH_SH wait type usually comes up as the result of fragmented or unoptimized index. Often reasons for excessive PAGEIOLATCH_SH wait type are: I/O subsystem has a problem or is misconfigured. Overloaded I/O subsystem by other processes that are producing the high I/O activity. Bad index management.
Why is SQL Server waiting for page to be retrieved?
This wait type accumulates while SQL Server is waiting for a page to be retrieved from disk and loaded into memory. The page collected will be used for a shared purpose (read operation). If this value is high it is likely disk or memory available are not keeping up with the workload