January 2012
Intermediate to advanced
542 pages
11h 28m
English
Content preview from Oracle Database 11gR2 Performance Tuning CookbookBecome 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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Tuning checkpoints
A checkpoint is used to ensure consistency in the database; during this operation, all data files are synchronized with the data blocks in memory.
The process responsible for signaling a checkpoint is the CKPT process, which signals the DBWn processes to write the dirty (modified) buffers from database buffer cache in memory to the data files.
During this operation data, file headers and control files are updated to store the last System Change Number (SCN), to ensure data block consistency.
In this recipe, we will see how to tune checkpoints in an Oracle database, to optimize all these write operations involved in checkpoints, balancing the trade-off between the redo log size and recovery time, in case of instance failure.
How ...
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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.
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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.