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https://dev.mysql.com/doc/refman/5.7/en/innodb-performance-ro-txn.html
You can still make changes to session-specific temporary tables in a read-only transaction, or issue locking queries for them, because those changes and locks are not visible to any other transaction. InnoDB can avoid the overhead associated with ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html
Information about table definitions is stored both in the .frm files, and in the InnoDB data dictionary. If you move .frm files around, or if the server crashes in the middle of a data dictionary operation, these sources of information can become ...
https://dev.mysql.com/doc/refman/5.7/en/libmysqld-example.html
These two example programs should work without any changes on a Linux or FreeBSD system. For other operating systems, minor changes are needed, mostly with file paths. These examples are designed to give enough details for you to understand the ...
https://dev.mysql.com/doc/refman/5.7/en/monitor-alter-table-performance-schema.html
You can monitor ALTER TABLE progress for InnoDB tables using Performance Schema. There are seven stage events that represent different phases of ALTER TABLE. Each stage event reports a running total of WORK_COMPLETED and WORK_ESTIMATED for the ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-disk-data-objects.html
NDB Cluster Disk Data storage is implemented using a number of Disk Data objects. These include the following: Tablespaces act as containers for other Disk Data objects. One or more undo log files are assigned to a log file group, which is then ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-log-statistics.html
The NDB management client's CLUSTERLOG STATISTICS command can provide a number of useful statistics in its output. Counters providing information about the state of the cluster are updated at 5-second reporting intervals by the transaction ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo-config-values.html
You can obtain output that is more specific, more detailed, or both by issuing the proper queries. The config_values table, implemented in NDB 7.5.0, provides information about the current state of node configuration parameter values. Each row in ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndbinfo.html
All ndbinfo tables are read-only, and are generated on demand when queried. ndbinfo is a database containing information specific to NDB Cluster. This database contains a number of tables, each providing a different sort of data about NDB Cluster ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-option-tables.html
Ndb_pushed_queries_defined: Number of joins that API nodes have attempted to push down to data nodes. Ndb_pushed_queries_dropped: Number of joins that API nodes have tried to push down, but failed. Ndb_pushed_queries_executed: Number of joins ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-6.html
New features and other important changes in NDB Cluster 7.6 which are likely to be of interest are shown in the following list: New Disk Data table file format. A new file format is used in NDB 7.6 for NDB Disk Data tables, which makes it possible ...