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https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-troubleshoot.html
loose-daemon_memcached_option='-c 64' To troubleshoot problems where the memcached daemon is unable to store or retrieve InnoDB table data, encode the -vvv memcached option in the daemon_memcached_option configuration parameter in the MySQL ...If ...
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-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-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/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-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/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/information-schema-innodb-table-reference.html
The following table summarizes INFORMATION_SCHEMA InnoDB tables. For greater detail, see the individual table descriptions. Table 28.3 INFORMATION_SCHEMA InnoDB Tables Table Name Description Introduced INNODB_BUFFER_PAGE Pages in InnoDB buffer pool ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-fulltext_index-tables.html
Before querying any of them, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table that contains the FULLTEXT index (for example, test/articles). Example 17.5 InnoDB FULLTEXT Index ...For ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-troubleshooting.html
The following general guidelines apply to troubleshooting InnoDB problems: When an operation fails or you suspect a bug, look at the MySQL server error log (see Section 7.4.2, “The Error Log”). Server Error Message Reference provides ...Enable ...When troubleshooting, it is usually best to run the MySQL server from the command prompt, rather than through mysqld_safe or as a Windows ...