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https://dev.mysql.com/doc/refman/8.0/en/charset-literal.html
Every character string literal has a character set and a collation. For the simple statement SELECT 'string', the string has the connection default character set and collation defined by the character_set_connection and collation_connection system ...It tells the parser, “the string that follows uses character set charset_name.” An introducer does not change the string to the introducer character set like CONVERT() would ...
https://dev.mysql.com/doc/refman/8.0/en/commit.html
Important Many APIs used for writing MySQL client applications (such as JDBC) provide their own methods for starting transactions that can (and sometimes should) be used instead of sending a START TRANSACTION statement from the client. This means ...
https://dev.mysql.com/doc/refman/8.0/en/connectors-apis.html
Both Connectors and the APIs enable you to connect and execute MySQL statements from another language or environment, including ODBC, Java (JDBC), C++, Python, Node.js, PHP, Perl, Ruby, and C. Connector/J provides driver support for connecting to ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-transactions.html
In general, you should avoid transactions that update both transactional and nontransactional tables in a replication environment. A statement that references both nontransactional and transactional tables and updates any of the tables involved is ...You should also avoid using any statement that accesses both transactional (or temporary) and nontransactional tables and writes to any of ...The server uses ...
https://dev.mysql.com/doc/refman/8.0/en/validate-password-options-variables.html
validate_password.dictionary_file can be set at runtime and assigning a value causes the named file to be read without a server restart. This section describes the system and status variables that validate_password provides to enable its operation ...This applies only when changing an existing password, and has no effect when setting a user account's initial ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-index-stat.html
--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving up. --delete Command-Line Format --delete Delete the index statistics for the ...This includes cache version and age, number of index entries per partition, and memory consumption by ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-logs-cluster-log.html
LCPFragmentCompleted Checkpoint 11 INFO Node node_id: ACC Blocked num_1 and TUP Blocked num_2 times last second Undo logging is blocked because the log buffer is close to overflowing. The cause of the problem is given as one of Busy, Election with ...For information about the cluster log, log events, and event types, see Section 25.6.3, “Event Reports Generated in NDB ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-top.html
With color support enabled, the graph display shows OS user time in blue, OS system time in green, and idle time as blank. For measured load, blue is used for execution time, yellow for send time, red for time spent in send buffer full waits, and ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-rule-based-filtering.html
This rule set drops information events, and, for other events, removes the source_line field: SET GLOBAL dragnet.log_error_filter_rules = 'IF prio>=INFORMATION THEN drop. To construct more complex conditions, use the AND and OR operators. Both ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-preload-buffer-pool.html
After restarting a busy server, there is typically a warmup period with steadily increasing throughput, as disk pages that were in the buffer pool are brought back into memory (as the same data is queried, updated, and so on). In addition to saving ... To reduce the warmup period after restarting the server, InnoDB saves a percentage of the most recently used pages for each buffer pool at server shutdown and restores these pages at server ...