Contents
What is InnoDB dirty pages?
InnoDB performs certain tasks in the background, including flushing of dirty pages from the buffer pool. Dirty pages are those that have been modified but are not yet written to the data files on disk. In MySQL 8.0, buffer pool flushing is performed by page cleaner threads.
What is Innodb_max_dirty_pages_pct?
MySQL flushes dirty pages to disk when it needs to load new data in the buffer pool. So, having dirty pages in InnoDB is something normal – it’s how it works and it’s done to improve the overall performance. But if you really want to get rid of them, set innodb_max_dirty_pages_pct to 0.
What is Innodb_log_file_size?
innodb_log_file_size is the size of a log file (in bytes). There exist multiple log file for MySQL to write the data to. This particular system-variable tells the file size of one of such log files.
Why are so many dirty blocks flushed at once in InnoDB?
InnoDB’s fuzzy checkpointing can cause stalls, as many dirty blocks are flushed at once as the checkpoint age nears the maximum. Adaptive checkpointing aims for more consistent flushing, approximately modified age / maximum checkpoint age. Can result in larger transaction log files
What’s the default value for the InnoDB plugin?
The default value is NULL, representing the MySQL plugin directory. You should not need to modify this parameter unless specifying a memcached plugin for a different storage engine that is located outside of the MySQL plugin directory. For more information, see Section 14.20.3, “Setting Up the InnoDB memcached Plugin” .
How is the maximum checkpoint age determined in InnoDB?
Description: Determines the method of flushing dirty blocks from the InnoDB buffer pool. If set to native or 0, the original InnoDB method is used. The maximum checkpoint age is determined by the total length of all transaction log files. When the checkpoint age reaches the maximum checkpoint age, blocks are flushed.
How often does InnoDB create a PID file?
The –innodb-status-file startup option controls whether InnoDB creates a file named innodb_status. pid in the data directory and writes SHOW ENGINE INNODB STATUS output to it every 15 seconds, approximately. The innodb_status. pid file is not created by default.