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https://dev.mysql.com/doc/refman/8.0/en/innodb-standard-monitor.html
A large number of threads waiting for semaphores may be a result of disk I/O, or contention problems inside InnoDB. The contents include the current log sequence number, how far the log has been flushed to disk, and the position at which InnoDB last ... The Lock Monitor is the same as the Standard Monitor except that it includes additional lock ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-expressions.html
If the value has too many digits in the integer part, it is too large (out of range) and is handled as follows: If strict mode is not enabled, the value is truncated to the nearest legal value and a warning is generated. If the value has too many ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-plugin-functions.html
If the sum of the margin values is larger than the argument length, no masking occurs and the argument is returned unchanged. If the sum of the margin values is larger than the argument length, the entire argument is masked. Example: mysql> SELECT ...Prior to MySQL 8.0.19, the functions treat string arguments as binary strings (which means they do not distinguish lettercase), and string return values are binary ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-data-node-memory-management.html
The size of the global shared memory for these resources is controlled by the SharedGlobalMemory configuration parameter (default: 128 MB). DataMemory is where records are stored, including hash indexes (approximately 15 bytes per row), ordered ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication-conflict-resolution.html
Note If you are replicating tables with very large columns (such as TEXT or BLOB columns), --ndb-log-updated-only can also be useful for reducing the size of the binary logs and avoiding possible replication failures due to exceeding ...Conflict ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-digests.html
However, if the special row accounts for a significant percentage of the statements executed, it might be desirable to increase the summary table size by increasing performance_schema_digests_size. However, the display length of statement digests ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-logging-configuration.html
For the example password IDs just shown, the corresponding keyring IDs are: audit_log-20190403T142359-1 audit_log-20190403T142400-1 audit_log-20190403T142400-2 The ID of the password currently used for encryption by the audit log plugin is the one ... This section describes how to configure audit logging characteristics, such as the file to which the audit log plugin writes events, the format of written events, whether to enable log file compression and encryption, and space ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-next-key-locking.html
The so-called phantom problem occurs within a transaction when the same query produces different sets of rows at different times. For example, if a SELECT is executed twice, but returns a row the second time that was not returned the first time, ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-select-all.html
ndb_select_all prints all rows from an NDB table to stdout. --gci Adds a GCI column to the output showing the global checkpoint at which each row was last updated. --gci64 Adds a ROW$GCI64 column to the output showing the global checkpoint at which ...Usage ndb_select_all -c connection_string tbl_name -d db_name [> file_name] Options that can be used with ndb_select_all are shown in the following ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-rbr-monitoring.html
The current progress of the replication applier (SQL) thread when using row-based replication is monitored through Performance Schema instrument stages, enabling you to track the processing of operations and check the amount of work completed and ...When these Performance Schema instrument stages are enabled the events_stages_current table shows stages for applier threads and their ...