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https://dev.mysql.com/doc/refman/8.0/en/flow-control-functions.html
If all types are temporal, the result is temporal: If all temporal types are DATE, TIME, or TIMESTAMP, the result is DATE, TIME, or TIMESTAMP, respectively. Otherwise, for a mix of temporal types, the result is DATETIME. The CASE statement cannot ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndbmtd.html
If the is the first time this node has failed, then these files are named ndb_3_trace.log.1_t1, ndb_3_trace.log.1_t2, ndb_3_trace.log.1_t3, and ndb_3_trace.log.1_t4. ndbmtd is a multithreaded version of ndbd, the process that is used to handle all ...ndbmtd is intended for use on host computers having multiple CPU ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-object-index.html
The following tables list sys schema objects and provide a short description of each one.
https://dev.mysql.com/doc/refman/8.0/en/innodb-page-compression.html
Supported Platforms Page compression requires sparse file and hole punching support. For example, if innodb_page_size=16K and the file system block size is 4K, page data must compress to less than or equal to 12K to make hole punching possible. Hole ... InnoDB supports page-level compression for tables that reside in file-per-table ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-tables-table.html
To update cached values at any time for a given table, use ANALYZE TABLE. Even with file-per-table mode with each InnoDB table in a separate .ibd file, change buffering can delay the write to the data file, so the file modification time is different ...The information_schema_stats_expiry system variable defines the period of time before cached table statistics ...If there are no cached ...
https://dev.mysql.com/doc/refman/8.0/en/charset-examples.html
Example 2: Table and Column Definition CREATE TABLE t1 ( c1 CHAR(10) CHARACTER SET latin1 ) DEFAULT CHARACTER SET latin1 COLLATE latin1_danish_ci; This time we have a column with a latin1 character set and a default collation. The following ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-secondary-indexes.html
There are additional write costs to consider when using a secondary index on a virtual column due to computation performed when materializing virtual column values in secondary index records during INSERT and UPDATE operations. A secondary index ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-gipks.html
Since sql_generate_invisible_primary_key was OFF at the time that auto_0 was created, no such additions were performed on that table. When a primary key is added to a table by the server, the column and key name is always my_row_id. When GIPKs are ... Beginning with MySQL 8.0.30, MySQL supports generated invisible primary keys for any InnoDB table that is created without an explicit primary ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-destination-configuration.html
This is your terminal or console window unless the standard error output has been redirected to a different destination. The server interprets options that determine the default error log destination somewhat differently for Windows and Unix systems. (--console takes precedence over --log-error if both are given, and the following items regarding --log-error do not apply.) If --log-error is not given, or is given without naming a file, the default destination is a file named host_name.err in the data directory, unless the --pid-file option is ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-introduction.html
With foreign keys, inserts, updates, and deletes are checked to ensure they do not result in inconsistencies across related tables. InnoDB is a general-purpose storage engine that balances high reliability and high performance. Key Advantages of ...