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https://dev.mysql.com/doc/refman/8.0/en/innodb-compression-syntax-warnings.html
This section describes syntax warnings and errors that you may encounter when using the table compression feature with file-per-table tablespaces and general tablespaces. SQL Compression Syntax Warnings and Errors for File-Per-Table Tablespaces ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-online-upgrade-methods.html
In this method there is only ever one group, and each server instance is removed from the group, upgraded and then rejoined to the group. For full information on version compatibility in a group and how this influences the behavior of a group during ... Choose one of the following methods of upgrading a Group Replication group: Rolling In-Group Upgrade This method is supported provided that servers running a newer version are not generating workload to the group while there are still servers with an older version in ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-buffer-pool-tables.html
The InnoDB INFORMATION_SCHEMA buffer pool tables provide buffer pool status information and metadata about the pages within the InnoDB buffer pool. Do not query these tables on a production system unless you are aware of the performance impact and ...The InnoDB INFORMATION_SCHEMA buffer pool tables include those listed below: mysql> SHOW TABLES FROM INFORMATION_SCHEMA LIKE 'INNODB_BUFFER%'; +-----------------------------------------------+ | Tables_in_INFORMATION_SCHEMA (INNODB_BUFFER%) | +-----------------------------------------------+ | INNODB_BUFFER_PAGE_LRU | | INNODB_BUFFER_PAGE | | INNODB_BUFFER_POOL_STATS | +-----------------------------------------------+ Table Overview INNODB_BUFFER_PAGE: Holds information about each page in the InnoDB buffer ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-general-info.html
Support for the NDB storage engine is not included in standard MySQL Server 8.0 binaries built by Oracle. NDB Cluster 8.0 users who build from source should use the sources provided for MySQL 8.0 and build with the options required to provide NDB ...
https://dev.mysql.com/doc/refman/8.0/en/replication-howto-additionalslaves.html
To do this, you can set up the new replica by copying the data directory of an existing replica, and giving the new replica a different server ID (which is user-specified) and server UUID (which is generated at startup). As an alternative to ... You ...
https://dev.mysql.com/doc/refman/8.0/en/resetting-permissions.html
If you know the root password and want to change it, see Section 15.7.1.1, “ALTER USER Statement”, and Section 15.7.1.10, “SET PASSWORD Statement”. The following sections provide instructions for Windows and Unix and Unix-like systems, as ...
https://dev.mysql.com/doc/refman/8.0/en/secure-client-programming.html
Handle External Data Properly Handle MySQL Error Messages Properly Handle External Data Properly Applications that access MySQL should not trust any data entered by users, who can try to trick your code by entering special or escaped character ...
https://dev.mysql.com/doc/refman/8.0/en/transport-protocols.html
For programs that use the MySQL client library (for example, mysql and mysqldump), MySQL supports connections to the server based on several transport protocols: TCP/IP, Unix socket file, named pipe, and shared memory. This section describes how to ...Otherwise, a connection to localhost results in a TCP/IP connection to ...
https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html
See Section 13.2.5, “Automatic Initialization and Updating for TIMESTAMP and DATETIME”. The exception is that, for TIMESTAMP and DATETIME columns, you can specify CURRENT_TIMESTAMP as the default. See Section 13.2.5, “Automatic Initialization ...Some aspects of explicit DEFAULT clause handling are version dependent, as described ...
https://dev.mysql.com/doc/refman/8.0/en/can-not-connect-to-server.html
If you get the error message Can't connect to MySQL server on some_host, you can try the following things to find out what the problem is: Check whether the server is running on that host by executing telnet some_host 3306 and pressing the Enter key ...You should check that there is a MySQL server running, that it has network connections enabled, and that the network port you specified is the one configured on the ... A MySQL client on Unix can connect to the mysqld server in two ...