Hi,
I have a sql2008 10.0.2531,x64 running on windows server 2008R2 SP1,x64. On daily basis, we do a huge ETL processing and during the ETL job, i see the following errors logged in ERRORLOG. I know that it is a sign of memory pressure on the system.I have a total memory of 90GB on server and max server memory is set to 80GB. I do not have any other third party DLLs using my SQL process space.
I read the following MSDN http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/thread/1b428290-b675-4565-8774-de13e18ac850/ where one of the recommendation is to regulate max server memory. I increased max server memory to 85GB still i see the same errors logged. I'm not sure how to resolve this issue????. I also see huge I/O latency on TempDB files. Is it due to I/O issue or is it because of memory spilling to TEmpdb which is again another sign of memory pressure because i see AppDomain unload also during the same time????
Thanks for the help in advance.
sp_configure has - CLR disabled
clr enabled 0 1 0 0
ERRORLOG
2013-02-23 22:34:52.790 spid51 Using 'xplog70.dll' version '2007.100.1600' to execute extended stored procedure 'xp_msver'. This is an informational message only; no user action is required.2013-02-23 22:36:16.580 spid61 Common language runtime (CLR) functionality initialized using CLR version v2.0.50727 from C:\Windows\Microsoft.NET\Framework64\v2.0.50727\.
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2013-02-26 21:37:43.920 spid58 AppDomain 12 (mssqlsystemresource.sys[runtime].11) created.
2013-02-26 22:24:15.670 spid1s AppDomain 12 (mssqlsystemresource.sys[runtime].11) is marked for unload due to memory pressure.
2013-02-26 22:24:15.670 spid15s AppDomain 12 (mssqlsystemresource.sys[runtime].11) unloaded.
2013-02-27 00:00:10.990 spid21s This instance of SQL Server has been using a process ID of 7152 since 2/23/2013 10:34:51 PM (local) 2/24/2013 3:34:51 AM (UTC). This is an informational message only; no user action is required.
2013-02-27 02:15:53.580 spid58 AppDomain 13 (mssqlsystemresource.sys[runtime].12) created.
2013-02-27 02:22:54.510 spid1s AppDomain 13 (mssqlsystemresource.sys[runtime].12) is marked for unload due to memory pressure.
2013-02-27 02:22:54.510 spid23s AppDomain 13 (mssqlsystemresource.sys[runtime].12) unloaded.
2013-02-27 03:49:15.630 spid8s SQL Server has encountered 13467 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [W:\MSSQL\Data\EarthDownload.mdf] in database [EarthDownload] (8). The OS file handle is 0x00000000000008D4.
The offset of the latest long I/O is: 0x00000b24020000
2013-02-27 03:57:48.340 spid58 AppDomain 14 (mssqlsystemresource.sys[runtime].13) created.
2013-02-27 04:33:43.270 spid8s SQL Server has encountered 135 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [V:\MSSQL\Data\tempdb2.ndf] in database [tempdb] (2). The OS file handle is 0x0000000000000A00.
The offset of the latest long I/O is: 0x00000064730000
2013-02-27 04:33:43.270 spid8s SQL Server has encountered 3149 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [U:\MSSQL\Data\tempdb1.ndf] in database [tempdb] (2). The OS file handle is 0x0000000000000A14.
The offset of the latest long I/O is: 0x0000007aed0000
2013-02-27 04:33:43.270 spid8s SQL Server has encountered 3036 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [V:\MSSQL\Data\tempdb6.ndf] in database [tempdb] (2). The OS file handle is 0x0000000000000A1C.
The offset of the latest long I/O is: 0x0000006f250000
2013-02-27 04:33:43.270 spid8s SQL Server has encountered 127 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [U:\MSSQL\Data\tempdb5.ndf] in database [tempdb] (2). The OS file handle is 0x0000000000000A20.
The offset of the latest long I/O is: 0x00000048ea0000
2013-02-27 05:04:00.510 spid1s AppDomain 14 (mssqlsystemresource.sys[runtime].13) is marked for unload due to memory pressure.
2013-02-27 05:04:00.510 spid25s AppDomain 14 (mssqlsystemresource.sys[runtime].13) unloaded.