Comments for Andrew Kerber's Oracle DBA Weblog http://dbakerber.wordpress.com The World of the Oracle DBA Sat, 28 Mar 2009 00:43:02 +0000 http://wordpress.com/ hourly 1 Comment on Finding Sql Execution Statistics by Date by Donald K. Burleson http://dbakerber.wordpress.com/2009/03/26/finding-sql-execution-statistics-by-date/#comment-23 Donald K. Burleson Sat, 28 Mar 2009 00:43:02 +0000 http://dbakerber.wordpress.com/2009/03/26/finding-sql-execution-statistics-by-date/#comment-23 Good script! It goes great with the other historical SQL analysis scripts: http://www.dba-oracle.com/t_find_historical_sql_by_date.htm Good script!

It goes great with the other historical SQL analysis scripts:

http://www.dba-oracle.com/t_find_historical_sql_by_date.htm

]]> Comment on Oracle Support? by Tommy http://dbakerber.wordpress.com/2008/12/15/oracle-support/#comment-21 Tommy Tue, 16 Dec 2008 14:37:04 +0000 http://dbakerber.wordpress.com/?p=14#comment-21 That is horrible, Oracle tech support ignoring a production down system. They were lucky to have you. That is horrible, Oracle tech support ignoring a production down system.

They were lucky to have you.

]]> Comment on Swap Space in Linux and Unix by dbakerber http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-19 dbakerber Tue, 12 Aug 2008 23:19:05 +0000 http://dbakerber.wordpress.com/?p=10#comment-19 Excellent, glad to hear that your problem has been resolved. Excellent, glad to hear that your problem has been resolved.

]]> Comment on Swap Space in Linux and Unix by Kuldeep Singh http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-18 Kuldeep Singh Tue, 12 Aug 2008 23:01:39 +0000 http://dbakerber.wordpress.com/?p=10#comment-18 Andrew - As promised here is the update - 1. Our Senior DBA has implemented MTS after careful consideration and we are seeing major improvement in memory/session management. The system is still under observation. Andrew – As promised here is the update –

1. Our Senior DBA has implemented MTS after careful consideration and we are seeing major improvement in memory/session management. The system is still under observation.

]]> Comment on Swap Space in Linux and Unix by Kuldeep Singh http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-16 Kuldeep Singh Thu, 31 Jul 2008 12:54:32 +0000 http://dbakerber.wordpress.com/?p=10#comment-16 Andrew/Mark - Thank you for helping out here. The information above might be relevant to our current problem. We will work with the DBA staff and the system administrators. I will post what we found or otherwise... Thanks, Kuldeep Andrew/Mark – Thank you for helping out here. The information above might be relevant to our current problem. We will work with the DBA staff and the system administrators. I will post what we found or otherwise…
Thanks,
Kuldeep

]]> Comment on Swap Space in Linux and Unix by dbakerber http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-15 dbakerber Thu, 31 Jul 2008 12:33:48 +0000 http://dbakerber.wordpress.com/?p=10#comment-15 In my experience, no there is no message about swap being full. Possibly because the space is actually getting marked as used, not being physically used for swapping? You would need to talk to a Unix System administrator on that one. The memory issue is really just an experienced guess. A 900 user system would not typically perform well in the amount memory that they have allocated. 32G is a good place to start on tuning the instance memory. However, they are on 32 bit Oracle, so they would also have to switch to 64 bit to do a lot of good. In my experience, no there is no message about swap being full. Possibly because the space is actually getting marked as used, not being physically used for swapping? You would need to talk to a Unix System administrator on that one.

The memory issue is really just an experienced guess. A 900 user system would not typically perform well in the amount memory that they have allocated. 32G is a good place to start on tuning the instance memory. However, they are on 32 bit Oracle, so they would also have to switch to 64 bit to do a lot of good.

]]> Comment on Swap Space in Linux and Unix by Mark A. Williams http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-14 Mark A. Williams Thu, 31 Jul 2008 04:18:26 +0000 http://dbakerber.wordpress.com/?p=10#comment-14 > What is the Oracle version? It looks like it is 8.1.7.4 based on the original posting. > Do you understand that there is a lot more to Oracle memory usage than PGA Memory? Yes. My question was why the recommendation to up the server memory to 32GB based upon the provided information? What in the provided information indicates that such action is necessary? Also, if there was insufficient swap space (i.e. the swap was exhausted/filled) would there not be a message in the system logs to indicate that event? Thanks, Mark > What is the Oracle version?

It looks like it is 8.1.7.4 based on the original posting.

> Do you understand that there is a lot more to Oracle memory usage than PGA Memory?

Yes. My question was why the recommendation to up the server memory to 32GB based upon the provided information? What in the provided information indicates that such action is necessary?

Also, if there was insufficient swap space (i.e. the swap was exhausted/filled) would there not be a message in the system logs to indicate that event?

Thanks,

Mark

]]> Comment on Swap Space in Linux and Unix by dbakerber http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-13 dbakerber Thu, 31 Jul 2008 03:08:10 +0000 http://dbakerber.wordpress.com/?p=10#comment-13 What is the Oracle version? Do you understand that there is a lot more to Oracle memory usage than PGA Memory? PGA is only the memory that the individual user processes need to run. The remainder of the memory on the server is used in the Oracle server processes and memory segments. For a 900 user system, it would not be at all unusual to have 100+G RAM devoted to the Oracle instance. It might be a good idea to take a class on Oracle concepts, or hire a consultant to run a tuning exercise on your Oracle instance. Oracle will not run in much less than 256M (that is, SGA_TARGET=256M). Oracle will not use more memory than it is granted by the PGA_TARGET and the SGA_MAX_SIZE or SGA_TARGET, the starting point for determining the appropriate amount of memory for your instance is the awr or statspack report. What is the Oracle version? Do you understand that there is a lot more to Oracle memory usage than PGA Memory? PGA is only the memory that the individual user processes need to run. The remainder of the memory on the server is used in the Oracle server processes and memory segments. For a 900 user system, it would not be at all unusual to have 100+G RAM devoted to the Oracle instance. It might be a good idea to take a class on Oracle concepts, or hire a consultant to run a tuning exercise on your Oracle instance.

Oracle will not run in much less than 256M (that is, SGA_TARGET=256M). Oracle will not use more memory than it is granted by the PGA_TARGET and the SGA_MAX_SIZE or SGA_TARGET, the starting point for determining the appropriate amount of memory for your instance is the awr or statspack report.

]]> Comment on Swap Space in Linux and Unix by Mark A. Williams http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-11 Mark A. Williams Thu, 31 Jul 2008 01:20:30 +0000 http://dbakerber.wordpress.com/?p=10#comment-11 > it would be a good idea to go to a 64 bit OS, and use about 32G RAM Why do you suggest that? The SGA is reported to be 900MB and the "session pga memory max" is reported to be 175MB making for just over 1GB of memory usage as I see it here. Why the need to jump from 6GB of RAM on the system to 32GB RAM when Oracle looks to be using about 1GB of the existing RAM? Thanks, Mark > it would be a good idea to go to a 64 bit OS, and use about 32G RAM

Why do you suggest that? The SGA is reported to be 900MB and the “session pga memory max” is reported to be 175MB making for just over 1GB of memory usage as I see it here. Why the need to jump from 6GB of RAM on the system to 32GB RAM when Oracle looks to be using about 1GB of the existing RAM?

Thanks,

Mark

]]> Comment on Swap Space in Linux and Unix by dbakerber http://dbakerber.wordpress.com/2008/04/18/swap-space-in-linux-and-unix/#comment-10 dbakerber Wed, 30 Jul 2008 22:56:40 +0000 http://dbakerber.wordpress.com/?p=10#comment-10 Realistically, to be able to handle the number of connections you are talking about, it would be a good idea to go to a 64 bit OS, and use about 32G RAM. Realistically, to be able to handle the number of connections you are talking about, it would be a good idea to go to a 64 bit OS, and use about 32G RAM.

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