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https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-limitations-syntax.html
Attempting to create an index on an NDB table column whose width is greater than 3072 bytes is rejected with ER_TOO_LONG_KEY: Specified key was too long; max key length is 3072 bytes. Attempting to create an index on an NDB table column whose width ... Some SQL statements relating to certain MySQL features produce errors when used with NDB tables, as described in the following list: Temporary ...
https://dev.mysql.com/doc/refman/5.7/en/storage-engines.html
row *************************** Engine: BLACKHOLE Support: YES Comment: /dev/null storage engine (anything you write to it disappears) Transactions: NO XA: NO Savepoints: NO *************************** 5. Blackhole: The Blackhole storage engine ...
https://dev.mysql.com/doc/refman/5.7/en/thread-information.html
row *************************** Id: 1 User: event_scheduler Host: localhost db: NULL Command: Daemon Time: 2756681 State: Waiting on empty queue Info: NULL *************************** 2. To ascertain what your MySQL server is doing, it can be ...
https://dev.mysql.com/doc/refman/5.7/en/where-optimization.html
This is also done for any NOT NULL expression when used with only one table. A table that is used with a WHERE clause on a PRIMARY KEY or a UNIQUE index, where all index parts are compared to constant expressions and are defined as NOT NULL. This ...
https://dev.mysql.com/doc/refman/5.7/en/data-masking-usage.html
General-Purpose Masking Functions mask_inner() and mask_outer() are general-purpose functions that mask parts of arbitrary strings based on position within the string: mask_inner() masks the interior of its string argument, leaving the ends unmasked. Converting the value to a binary string ensures that the function sees an argument of length ... Before using MySQL Enterprise Data Masking and De-Identification, install it according to the instructions provided at ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-config.html
--connect-string Command-Line Format --connect-string=connection_string Type String Default Value [none] Same as --ndb-connectstring. --defaults-extra-file Command-Line Format --defaults-extra-file=path Type String Default Value [none] Read given ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-statistics-table.html
This can have values A (ascending), D (descending), or NULL (not sorted). That is, the number of indexed characters if the column is only partly indexed, NULL if the entire column is indexed. However, prefix lengths for index specifications in ...
https://dev.mysql.com/doc/refman/5.7/en/known-issues.html
When inserting a big integer value (between 263 and 264−1) into a decimal or string column, it is inserted as a negative value because the number is evaluated in signed integer context. SELECT statements that insert zero or NULL values into an ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-differing-tables.html
A column's default value is determined by a number of factors, including its type, whether it is defined with a DEFAULT option, whether it is declared as NULL, and the server SQL mode in effect at the time of its creation; for more information, see ... Source and target tables for replication do not have to be ...
https://dev.mysql.com/doc/refman/5.7/en/gis-format-conversion-functions.html
There are also functions to convert a string from WKT or WKB format to internal geometry format. ST_AsText(g), ST_AsWKT(g) Converts a value in internal geometry format to its WKT representation and returns the string result. mysql> SET @g = ...