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https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-operations-per-fragment.html
The table_id column value is unique at any given time, but can be reused if the corresponding object has been deleted. Generally, such a refusal is due to duplicate keys (inserts), Key not found errors (updates, deletes, and reads), or the operation ... The operations_per_fragment table provides information about the operations performed on individual fragments and fragment replicas, as well as about some of the results from these ...
https://dev.mysql.com/doc/refman/8.4/en/sys-schema-object-index.html
The following tables list sys schema objects and provide a short description of each one.
https://dev.mysql.com/doc/c-api/8.4/en/c-api-optional-metadata.html
When a client executes a statement that produces a result set, MySQL makes available the data the result set contains, and by default also result set metadata that provides information about the result set data. Suppression of metadata transfer by ...Metadata is contained in the MYSQL_FIELD structure (see Section 5.2, “C API Basic Data Structures”), which is returned by the mysql_fetch_field(), mysql_fetch_field_direct(), and mysql_fetch_fields() ...
https://dev.mysql.com/doc/internals/en/select-select-engine.html
If this is the first time, call JOIN::optimize and JOIN::exec(), else do nothing or JOIN::reinit()JOIN::exec() depending on type of subquery. subselect_single_select_engine: constructor allocate JOIN and store pointers on SELECT_LEX and JOIN.
https://dev.mysql.com/doc/internals/en/capability-negotiation.html
They can agree on: use of status flags use of SQL states for error-codes authentication methods SSL support Compression . To permit an old client to connect to newer servers, the initial handshake contains the MySQL Server version the server's ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-enabling-monitors.html
When InnoDB monitors are enabled for periodic output, InnoDB writes the output to mysqld server standard error output (stderr) every 15 seconds, approximately. If you want to direct the output to the console window rather than to the error log, ...
https://dev.mysql.com/doc/connectors/en/connector-net-tutorials-document-store.html
Execute the world_x.sql script to create the database structure and insert the data as follows: mysql> SOURCE /temp/world_x.sql; Replace /temp/ with the path to the world_x.sql file on your system. string schemaName = "world_x"; // Define the ...
https://dev.mysql.com/doc/connector-net/en/connector-net-tutorials-document-store.html
Execute the world_x.sql script to create the database structure and insert the data as follows: mysql> SOURCE /temp/world_x.sql; Replace /temp/ with the path to the world_x.sql file on your system. string schemaName = "world_x"; // Define the ...
https://dev.mysql.com/doc/mysql-em-plugin/en/myoem-cluster-metric-mysqlserver-trxstatementactivity-category.html
Table 8.10 Trx Statement Activity Metrics NameDescriptionTarget Name Name of the OEM Target Begin (Delta) The total number of BEGIN | START TRANSACTION statements executed. Release Savepoint (Delta) The total number of RELEASE SAVEPOINT statements ... Lists the Trx Statement Activity metrics and provides a brief description of ...
https://dev.mysql.com/doc/mysql-em-plugin/en/myoem-metric-mysqlserver-trxstatementactivity-category.html
Table 6.46 Trx Statement Activity Metrics NameDescriptionBegin (Delta) The total number of BEGIN | START TRANSACTION statements executed. Release Savepoint (Delta) The total number of RELEASE SAVEPOINT statements executed. Rollback To Savepoint ...