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https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-metrics-table.html
[mysqld] innodb_monitor_enable = log,metadata_table_handles_opened,metadata_table_handles_closed When enabling multiple counters or modules in a configuration file, specify the innodb_monitor_enable variable followed by counter and module names ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-tuning.html
Because using InnoDB in combination with memcached involves writing all data to disk, whether immediately or sometime later, raw performance is expected to be somewhat slower than using memcached by itself. get key_value Using System Memory For ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-intro.html
By default, the memcached protocol is used to read and write data directly to InnoDB, letting MySQL manage in-memory caching using the InnoDB buffer pool. Advanced users can configure the system as a traditional memcached server, with all data ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-disk-io.html
Before writing pages to a data file, InnoDB first writes them to a storage area called the doublewrite buffer. Only after the write and the flush to the doublewrite buffer has completed does InnoDB write the pages to their proper positions in the ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-logging.html
When InnoDB has written redo log files full, it must write the modified contents of the buffer pool to disk in a checkpoint. From MySQL 8.0.30, the redo log file size is determined by the innodb_redo_log_capacity setting. InnoDB tries to maintain 32 ... Consider the following guidelines for optimizing redo logging: Increase the size of your redo log ...Dedicated log writer threads can improve performance on high-concurrency ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-configuration-variables.html
Because the InnoDB storage engine performs many of its optimizations automatically, many performance-tuning tasks involve monitoring to ensure that the database is performing well, and changing configuration options when performance drops. The main ...Because the default is to buffer all types of data change operations, only change this setting if you need to reduce the amount of ... Different settings work best for servers ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-buffer-pool-resize.html
Command line: $> mysqld --innodb-buffer-pool-chunk-size=134217728 Configuration file: [mysqld] innodb_buffer_pool_chunk_size=134217728 The following conditions apply when altering innodb_buffer_pool_chunk_size: If the new ... You can configure ...A ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlock-example.html
If client A attempts to update a row in Birds at the same time, this will lead to a deadlock: mysql> UPDATE Birds SET value=40 WHERE name='Buzzard'; ERROR 1213 (40001): Deadlock found when trying to get lock; try restarting transaction InnoDB rolls ... The following example illustrates how an error can occur when a lock request causes a ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-standard-monitor.html
You can calculate from these numbers how many data file I/O operations your queries currently are doing. Standard Monitor output is limited to 1MB when produced using the SHOW ENGINE INNODB STATUS statement. The number of seconds is the elapsed time ... The Lock Monitor is the same as the Standard Monitor except that it includes additional lock ...SEMAPHORES This section reports threads waiting for a semaphore and ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-tuning-monitoring.html
To guard against imposing this monitoring overhead by accident, you must enable the innodb_cmp_per_index_enabled configuration option before you can query the INNODB_CMP_PER_INDEX table. Overall application performance, CPU and I/O utilization and ...To dig deeper into performance considerations for compressed tables, you can monitor compression performance at runtime using the Information Schema tables described in Example 17.1, “Using the Compression Information Schema ...