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https://dev.mysql.com/doc/refman/8.0/en/sys-innodb-buffer-stats-by-table.html
These views summarize the information in the INFORMATION_SCHEMA INNODB_BUFFER_PAGE table, grouped by schema and table. Do not query these views on a production system unless you are aware of the performance impact and have determined it to be ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-buffer-pool-stats-table.html
The idea of making pages in the buffer pool “young” or “not young” refers to transferring them between the sublists at the head and tail of the buffer pool data structure. For related usage information and examples, see Section 17.15.5, ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-calendar.html
Monday Tuesday Wednesday Thursday Friday Saturday Sunday 1 2 3 4 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 There are no dates between October 4 and October 15. Any dates before the cutover are Julian, and any dates following the cutover are ...A calendar applied to dates when it was not actually in use is called ...
https://dev.mysql.com/doc/refman/8.0/en/loading-tables.html
Suppose that Diane gets a new hamster named “Puffball.” You could add a new record using an INSERT statement like this: mysql> INSERT INTO pet VALUES ('Puffball','Diane','hamster','f','1999-03-30',NULL); String and date values are specified as ...You could create a text file pet.txt containing one record per line, with values separated by tabs, and given in the order in which the columns were listed in the CREATE TABLE ...
https://dev.mysql.com/doc/refman/8.0/en/recovery-from-backups.html
To restore the changes made since then, we must use the incremental backups; that is, the gbichot2-bin.000007 and gbichot2-bin.000008 binary log files. | mysql For more information about using mysqlbinlog to process binary log files, see Section ...
https://dev.mysql.com/doc/refman/8.0/en/constant-folding-optimization.html
Comparisons between constants and column values in which the constant value is out of range or of the wrong type with respect to the column type are now handled once during query optimization rather row-by-row than during execution. The comparisons ...Consider the table created by the following statement: CREATE TABLE t (c TINYINT UNSIGNED NOT NULL); The WHERE condition in the query SELECT * FROM t WHERE c < 256 contains the integral constant 256 which is out of range for a TINYINT UNSIGNED ...
https://dev.mysql.com/doc/refman/8.0/en/custom-benchmarks.html
Benchmark your application and database to find out where the bottlenecks are. Even if the overall performance for your application currently is acceptable, you should at least make a plan for each bottleneck and decide how to solve it if someday ...After fixing one bottleneck (or by replacing it with a “dummy” module), you can proceed to identify the next ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-sql-modes.html
What is the default server SQL mode when MySQL 8.0 is installed? The default SQL mode in MySQL 8.0 includes these modes: ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE, ERROR_FOR_DIVISION_BY_ZERO, and NO_ENGINE_SUBSTITUTION.
https://dev.mysql.com/doc/refman/8.0/en/group-replication-message-compression.html
The LZ4 maximum input size is therefore a practical limit for message compression, and transactions above this size cannot be committed when message compression is enabled. Compression for these messages, which are sent from a donor already in the ... For messages sent between online group members, Group Replication enables message compression by ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-index-cache-table.html
The same word can occur several times within the cache table, once for each combination of DOC_ID and POSITION values. For related usage information and examples, see Section 17.15.4, “InnoDB INFORMATION_SCHEMA FULLTEXT Index Tables”. Use the ...