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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Redo Log Dump
Redo logs keep the undo and redo information of every atomic database change operations. The changes are recorded as opcodes (operation codes), which are usually in the form of layer code.operation code format. For example, opcode 4.1 indicates block cleanout operation at transaction block layer.
Note, redo layers are not to be confused with Oracle’s kernel layers. Redo layers are used only in conjunction with redo generation and redo logging.
Redo log dumps are normally requested by Oracle Support to analyze the data corruption (logical corruption) issues. If it is used intelligently it can be an auditing tool also. For example, if you would like to know the time and date of an extent allocated for a segment, you can dump the relevant ...
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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.