Hi experts,
Our users complain SAP on SQL becomes slow sometimes recently. I check wait
event and find WRITELOG become top 1 in wait events. This never happened
before. I use Perfmon to check Avg. disk sec/Write is zero(<0.001). It does
not seem to be a storage issue. What happened?<o:p></o:p>
By the way, I use SQL 2012 with AlwaysOn(Sync mode), HADR_SYNC_COMMIT = 2.58
and it seems to be ok. What is the Amount of outstanding log I/O limit in SQL
server 2012? ( Diagnosing Transaction Log Performance Issues and Limits of the Log Manager - Microsoft SQL Server Development Customer… )
- ---Wait event when system is slow ---PS:first row: wait event namesecond row: Total Wait Time(ms)third row: Total Wait Time(%)fourth row: Avg. wait. (micro sec)