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
Content preview from Oracle Wait Interface: A Practical Guide to Performance Diagnostics & TuningBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Overhead
Performance sampling with SQL has some overheads in the sense that the SQL statements are subject to Oracle’s architecture and limits. The SQL statements must be parsed and optimized before execution. This involves dictionary lookups, latch acquisitions, etc. During the execution of the statements, the process must compete for resources as other Oracle processes. This involves latch and buffer lock acquisitions, consistent read image constructions, and various other potential waits. All these activities add to the overhead, and the overhead increases with higher sampling frequencies. But accessing the SGA directly from an external program does not introduce this kind of overhead to the Oracle instance. However, both types of access require ...
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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.