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https://dev.mysql.com/doc/refman/5.7/en/innodb-troubleshooting-datadict.html
Information about table definitions is stored both in the .frm files, and in the InnoDB data dictionary. If you move .frm files around, or if the server crashes in the middle of a data dictionary operation, these sources of information can become ...
https://dev.mysql.com/doc/refman/5.7/en/select-into.html
If the FIELDS ESCAPED BY character is empty, no characters are escaped and NULL is output as NULL, not \N. INTO form of SELECT enables a query result to be stored in variables or written to a file: SELECT ... Column and line terminators can be ...
https://dev.mysql.com/doc/refman/5.7/en/using-date.html
MySQL also permits a “relaxed” string format when updating and in a WHERE clause that compares a date to a DATE, DATETIME, or TIMESTAMP column. MySQL can also convert a string containing no separators (such as '20040815'), provided it makes ...
https://dev.mysql.com/doc/refman/5.7/en/converting-tables-to-innodb.html
Consider using an auto-increment column if there is not another stable, unique, non-null, numeric column to use. You can designate the former primary key columns as UNIQUE NOT NULL to enforce the same constraints as the PRIMARY KEY clause, that is, ... If you have MyISAM tables that you want to convert to InnoDB for better reliability and scalability, review the following guidelines and tips before ...
https://dev.mysql.com/doc/refman/5.7/en/mysqlbinlog.html
--base64-output=value Command-Line Format --base64-output=value Type String Default Value AUTO Valid Values AUTONEVERDECODE-ROWS This option determines when events should be displayed encoded as base-64 strings using BINLOG statements. The server's ...
https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html
binary: Any kind of binary string argument, including a hexadecimal literal, bit literal, or NULL literal. nonliteral_binary: An argument that is a binary string value other than a hexadecimal literal, bit literal, or NULL literal. mysql> SELECT 5 & ... Table 12.17 Bit Functions and Operators Name Description & Bitwise AND >> Right shift << Left shift ^ Bitwise XOR BIT_COUNT() Return the number of bits that are set | Bitwise OR ~ Bitwise inversion The following list describes available bit functions and operators: | Bitwise ...
https://dev.mysql.com/doc/refman/5.7/en/create-tablespace.html
The precise syntax and semantics depend on the storage engine used. In standard MySQL 5.7 releases, this is always an InnoDB tablespace. MySQL NDB Cluster 7.5 also supports tablespaces using the NDB storage engine in addition to those using InnoDB.
https://dev.mysql.com/doc/refman/5.7/en/replication-features-memory.html
To replicate this effect to replicas, the first time that the source uses a given MEMORY table after startup, it logs an event that notifies replicas that the table must be emptied by writing a DELETE or (from MySQL 5.7.32) TRUNCATE TABLE statement ... When a replication source server shuts down and restarts, its MEMORY tables become ...
https://dev.mysql.com/doc/refman/5.7/en/engine-condition-pushdown-optimization.html
column IS [NOT] NULL column IN (value_list) Each item in the value_list must be a constant, literal value. A string value to be compared with a column must use the same collation as the column. This optimization improves the efficiency of direct ...
https://dev.mysql.com/doc/refman/5.7/en/cost-model.html
Any non-NULL cost estimate specified in the tables takes precedence over the corresponding compiled-in default cost constant. Any NULL estimate indicates to the optimizer to use the compiled-in default. It is also easy to revert to a default by ...