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https://dev.mysql.com/doc/refman/5.7/en/multibyte-characters.html
If you want to add support for a new character set named MYSET that includes multibyte characters, you must use multibyte character functions in the ctype-MYSET.c source file in the strings directory. The existing character sets provide the best ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-memory-model.html
Memory used depends on the load actually seen, not the load estimated or explicitly configured for. As the Performance Schema collects data, memory is allocated in the corresponding buffer. The buffer size is unbounded, and may grow with the load.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-options.html
Runtime configuration is also possible in many cases (see Section 25.4, “Performance Schema Runtime Configuration”), but startup configuration must be used when runtime configuration is too late to affect instruments that have already been ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-backup-troubleshooting.html
If an error code is returned when issuing a backup request, the most likely cause is insufficient memory or disk space. You should check that there is enough memory allocated for the backup. Important If you have set BackupDataBufferSize and ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-geohash-functions.html
For the second syntax, a POINT value is required, where the X and Y coordinates are in the valid ranges for longitude and latitude, respectively. Characters past the 433rd are ignored, even if they are otherwise illegal and produce an error. The ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-schema.html
ndb_apply_status Table ndb_binlog_index Table ndb_replication Table Replication in NDB Cluster makes use of a number of dedicated tables in the mysql database on each MySQL Server instance acting as an SQL node in both the cluster being replicated ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-compression-tables.html
There are two pairs of InnoDB INFORMATION_SCHEMA tables about compression that can provide insight into how well compression is working overall: INNODB_CMP and INNODB_CMP_RESET provide information about the number of compression operations and the ...INNODB_CMPMEM and INNODB_CMPMEM_RESET provide information about the way memory is allocated for ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-ndb-innodb-usage.html
When comparing application feature requirements to the capabilities of InnoDB with NDB, some are clearly more compatible with one storage engine than the other. The following table lists supported application features according to the storage ...
https://dev.mysql.com/doc/refman/5.7/en/sys-latest-file-io.html
These views summarize file I/O activity, grouped by file and thread. The latest_file_io and x$latest_file_io views have these columns: thread For foreground threads, the account associated with the thread (and port number for TCP/IP connections).
https://dev.mysql.com/doc/refman/5.7/en/replication-features-transaction-inconsistencies.html
When using a multithreaded replica, workers which have not received an error complete their queues, so it may take time to stop all threads. Inconsistencies in the sequence of transactions that have been executed from the relay log can occur ...