Suddenly database IO(40 MB/sec) going very high
Hello Everyone,
One of our organization SQL server database IO(40 MB/sec)
going very high without any changes in database, past few days everything working fine but now getting in problem and wait type getting
IO_COMPLETION in every running task..
getting any problem if 2 network card bridging or timing at OS level...
its very tedious job to identify.
Plz suggest me to resolve my problem.....
thanks in advance
check this blog -
http://www.sqlskills.com/blogs/paul/causes-io_completion-write_completion-sql-server-wait-types/
IO_COMPLETION
Reading log blocks from the transaction log (during any operation that causes the log to be read from disk – e.g. recovery)
Reading allocation bitmaps from disk (e.g. GAM, SGAM, PFS pages) during many operations (e.g. recovery, DB startup, restore)
Writing intermediate sort buffers to disk (these are called ‘Bobs’)
Reading and writing merge results from/to disk during a merge join
Reading and writing eager spools to disk
Reading VLF headers from the transaction log
Do you have log files in seperate disks? Check the disks where log files are placed and check the log files properties. Check if any of the above operations are happening more recently.
Regards, Ashwin Menon My Blog - http:\\sqllearnings.com
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