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https://dev.mysql.com/doc/refman/5.7/en/information-schema-profiling-table.html
Its contents correspond to the information produced by the SHOW PROFILE and SHOW PROFILES statements (see Section 13.7.5.30, “SHOW PROFILE Statement”). The table is empty unless the profiling session variable is set to 1. Use the Performance ...
https://dev.mysql.com/doc/refman/5.7/en/operator-precedence.html
Section 13.7.4.1, “SET Syntax for Variable Assignment”, and Section 9.4, “User-Defined Variables”, explain how MySQL determines which interpretation of = should apply. For operators that occur at the same precedence level within an ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema.html
MySQL 5.7 includes the sys schema, a set of objects that helps DBAs and developers interpret data collected by the Performance Schema. mysql_upgrade returns an error if a sys schema exists but has no version view, on the assumption that absence of ...sys schema objects can be used for typical tuning and diagnosis use ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-online-operations.html
Such operations do not require single user mode for NDB table alterations made in an NDB cluster with multiple API nodes; transactions can continue uninterrupted during online DDL operations. row *************************** Level: Warning Code: 1478 ...For ALGORITHM=COPY, the mysqld NDB Cluster handler performs the following actions: Tells the data nodes to create an empty copy of the table, and to make the required schema changes to this ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-batch-commands.html
file_name Sometimes you may want your script to display progress information to the user. For this you can insert statements like this: SELECT '<info_to_display>' AS ' '; The statement shown outputs <info_to_display>. You can also invoke mysql with ... The mysql client typically is used interactively, like this: mysql db_name However, it is also possible to put your SQL statements in a file and then tell mysql to read its input from that ...
https://dev.mysql.com/doc/refman/5.7/en/x-plugin-status-variables.html
Mysqlx_ssl_cipher_list A list of possible SSL ciphers (empty for non-SSL connections). Mysqlx_ssl_server_not_after The last date for which the SSL certificate is valid. Mysqlx_ssl_server_not_before The first date for which the SSL certificate is ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-checkpoints.html
There is no need to flush the buffer pool in one single batch, which would disrupt processing of user SQL statements during the checkpointing process. It knows that all modifications to the database before the label are present in the disk image of ...It often makes sense to set the total size of the log files as large as the buffer pool or even ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-issues.html
(A gap event is a type of “incident event,” which indicates an incident that occurs that affects the contents of the database but that cannot easily be represented as a set of changes. For information about implementing this type of setup, see ...If this occurs, it is entirely possible for new data to be inserted into the source cluster without being recorded in the source SQL node's binary ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-config.html
--ndb-nodeid Command-Line Format --ndb-nodeid=# Type Integer Default Value [none] Set node ID for this node, overriding any ID set by --ndb-connectstring. This tool extracts current configuration information for data nodes, SQL nodes, and API nodes ...It is also possible to use a data node as the source by specifying its node ID with ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-deadlock-detection.html
For techniques to organize database operations to avoid deadlocks, see Section 14.7.5, “Deadlocks in InnoDB”. At times, it may be more efficient to disable deadlock detection and rely on the innodb_lock_wait_timeout setting for transaction ...