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https://dev.mysql.com/doc/refman/8.0/en/precision-math-examples.html
This section provides some examples that show precision math query results in MySQL. These examples demonstrate the principles described in Section 14.24.3, “Expression Handling”, and Section 14.24.4, “Rounding Behavior”. Consider the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-innodb-redo-log-files-table.html
The redo log file size on disk is slightly larger due to the file header (2048 bytes), which is not included in the value reported by this column. The innodb_redo_log_files table contains a row for each active InnoDB redo log file. SIZE_IN_BYTES ...
https://dev.mysql.com/doc/refman/8.0/en/diagnostics-area.html
Diagnostics Area Structure Diagnostics Area Information Items How the Diagnostics Area is Cleared and Populated How the Diagnostics Area Stack Works Diagnostics Area-Related System Variables Diagnostics Area Structure The diagnostics area contains ... SQL statements produce diagnostic information that populates the diagnostics ...
https://dev.mysql.com/doc/refman/8.0/en/crashing.html
Fixed-size rows take a little extra space, but are much more tolerant to corruption. If you have a problem with tables containing dynamic-length rows and you are using only VARCHAR columns (not BLOB or TEXT columns), you can try to change all ...
https://dev.mysql.com/doc/refman/8.0/en/gtid-functions.html
row *************************** GTID_SUBSET('3E11FA47-71CA-11E1-9E33-C80AA9429562:23', '3E11FA47-71CA-11E1-9E33-C80AA9429562:21-57'): 1 1 row in set (0.00 sec) mysql> SELECT GTID_SUBSET('3E11FA47-71CA-11E1-9E33-C80AA9429562:23-25', -> ... The ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-object-filtering.html
The OBJECT_TYPE column indicates the type of object to which a row applies. (Tables in the INFORMATION_SCHEMA database are not instrumented regardless of the contents of setup_objects; the row for information_schema.% simply makes this default ...
https://dev.mysql.com/doc/refman/8.0/en/semijoins.html
For an inner join between two tables, the join returns a row from one table as many times as there are matches in the other table. Assuming that class_num is a primary key in the class table, duplicate suppression is possible by using SELECT ... A ...
https://dev.mysql.com/doc/refman/8.0/en/sys-statement-performance-analyzer.html
statement_performance_analyzer.limit, @sys.statement_performance_analyzer.limit The maximum number of rows to return for views that have no built-in limit. mysql> CALL sys.statement_performance_analyzer('delta', 'mydb.tmp_digests_ini', ... Creates a ...
https://dev.mysql.com/doc/refman/8.0/en/clone-plugin-compressed-data.html
The donor and recipient file systems must have the same block size. If file system block sizes differ, an error similar to the following is reported: ERROR 3868 (HY000): Clone Configuration FS Block Size: Donor value: 114688 is different from ...The ...
https://dev.mysql.com/doc/refman/8.0/en/encrypted-connection-protocols-ciphers.html
The negotiation process depends on factors such as the SSL library used to compile the server and client, the TLS protocol and encryption cipher configuration, and which key size is used: For a connection attempt to succeed, the server and client ...