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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/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/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 ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-trx-table.html
TRX_REQUESTED_LOCK_ID The ID of the lock the transaction is currently waiting for, if TRX_STATE is LOCK WAIT; otherwise NULL. TRX_WAIT_STARTED The time when the transaction started waiting on the lock, if TRX_STATE is LOCK WAIT; otherwise NULL. The ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-triggers-table.html
This is a TIMESTAMP(2) value (with a fractional part in hundredths of seconds) for triggers created in MySQL 5.7.2 or later, NULL for triggers created prior to 5.7.2. To see information about a table's triggers, you must have the TRIGGER privilege ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-ddl.html
You can access the underlying InnoDB table (which is test.demo_test by default) through standard SQL interfaces. However, there are some restrictions: When querying a table that is also accessed through the memcached interface, remember that ...
https://dev.mysql.com/doc/refman/5.7/en/numeric-type-attributes.html
When you insert a value of NULL into an indexed AUTO_INCREMENT column, the column is set to the next sequence value. (AUTO_INCREMENT sequences begin with 1.) Storing 0 into an AUTO_INCREMENT column has the same effect as storing NULL, unless the ...