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How do I resolve Pageiolatch ex wait type?
Suggested solutions
- Add additional memory.
- Investigate disk latency.
- Increase the maximum memory allocation.
- Indexing, look for high disk I/O queries.
- Enable data page compression if CPU usage is not suffering.
What is Pageiolatch_sh?
PAGEIOLATCH_SH. Occurs when a task is waiting on a latch for a buffer that is in an I/O request. The latch request is in Shared mode. Long waits may indicate problems with the disk subsystem. In practice, this almost always happens due to large scans over big tables.
What is Pagelatch_sh?
(Republishing, or using this info in a commercial product/website, is prohibited without permission. Description: This wait type is when a thread is waiting for access to a data file page in memory so that it can read the page structure (SH = SHare mode).
What is SQL latch wait time?
dm_os_latch_stats; A latch wait is a delay associated with the latch, and is often caused by the I/O system not keeping up with requests so it is taking a long time to get pages from disk into memory. Buffer latch contention is one common reason for long latch waits.
What is TempDB contention?
TempDB metadata contention occurs when many sessions try to access the SQL Server TempDB’s system tables at the same time during the creation of the temp tables. This heavy workload causes latency on these system tables due to this reason, and the query performance will be decreased.
What does pageiolatch _ ex mean in SQL Server?
PAGEIOLATCH_EX. Description. 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 an exclusive purpose (read or write operations). If this value is high it is likely that disk or available memory are not keeping up with the workload.
Why does SQL Server pagelatch _ ex keep waiting?
The knee-jerk reaction to this wait type is that it must be the I/O subsystem that has a problem, and so sometimes people add more memory or investigate the I/O subsystem, but these waits are for pages that are *already* in memory. Common causes of PAGELATCH_XX contention are:
What does pageiolatch _ SH mean in Windows 10?
The PAGEIOLATCH_SH could indicate a problem with the I/O subsystem, i.e. problem with the disk. It is often possible that faulty disk does not trigger the monitoring system and in fact the disc issues could be very tricky, as disk could experience various issues which are not black and white (work/doesn’t work).
How to troubleshoot third case of SQL Server pagelatch?
Troubleshooting the third case involves figuring out which index is undergoing the page splits and then usually implementing a fill factor and regular index maintenance. You can get the workflow for identifying a table from a page resource (from sys.dm_os_waiting_tasks) in this blog post.