July 2004
Intermediate to advanced
384 pages
9h 32m
English
book
Oracle Wait Interface: A Practical Guide to Performance Diagnostics & Tuning
by Richmond Shee, Kirtikumar Deshpande, K Gopalakrishnan
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Active Session History
In Oracle Database 10g, the current session activity can be obtained from the V$SESSION or V$SESSION_WAIT views. The view V$SESSION_WAIT_HISTORY provides information about the last 10 wait events that the session encountered. However, for troubleshooting a performance issue, these views do not provide enough historical information about what the session did. Oracle Database 10g solves this problem with the introduction of Active Session History (ASH).
As the name suggests, Oracle provides historical information on active sessions. It samples all active sessions every second to track their state and stores this information in a buffer in the SGA.
TABLE 9-2. AWR Views (Not a Complete List)
The historical information is displayed ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.