Solved

Sizing the PGA

Posted on 2011-03-24
4
332 Views
Last Modified: 2012-05-11
What is the best way to determing the optiminal size of the pga_aggregrate_target?
0
Comment
Question by:msimons4
  • 3
4 Comments
 
LVL 73

Expert Comment

by:sdstuber
Comment Utility
let your system run with realistic loads for a while then check V$PGA_TARGET_ADVICE


"realistic" and "a while" are going to be determined by your database and application.
If you have fairly uniform load that occurs all the time you might need only a few hours to give the system enough time to gather useful information.

If you have peaks and valleys of usage and/or of different types of activities it will take longer.  There is no absolute number that will apply to all.
0
 
LVL 73

Accepted Solution

by:
sdstuber earned 500 total points
Comment Utility
you can also use information found in v$pga_target_advice_histogram to get a little more detailed view
but  I usually see the first view giving enough and the histograms simply support that info rather than provide different recommendation
0
 

Author Comment

by:msimons4
Comment Utility
Is there a way to plot the inverse of sort area and see where the inflection point is?
0
 
LVL 73

Expert Comment

by:sdstuber
Comment Utility
where are you seeing sort area trending?

I don't see a column by that name in either of the views above in my db.

Are you referring to sort_area_size  v$parameter?

If so,  that's a single value,  there is no curve inflection for one point.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Join & Write a Comment

This post first appeared at Oracleinaction  (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself). I  will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…
From implementing a password expiration date, to datatype conversions and file export options, these are some useful settings I've found in Jasper Server.
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
This video explains at a high level about the four available data types in Oracle and how dates can be manipulated by the user to get data into and out of the database.

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now