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https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-limitations-syntax.html
Using nullable columns in unique keys and primary keys means that queries using these columns are handled as full table scans. To work around this issue, make the column NOT NULL, or re-create the index without the USING HASH option. Some SQL ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-blob-tool.html
This tool can be used to check for and remove orphaned BLOB column parts from NDB tables, as well as to generate a file listing any orphaned parts. It is sometimes useful in diagnosing and repairing corrupted or damaged NDB tables containing BLOB ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-size-pl.html
This is a Perl script that can be used to estimate the amount of space that would be required by a MySQL database if it were converted to use the NDBCLUSTER storage engine. Unlike the other utilities discussed in this section, it does not require ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-top.html
--passwd[=password], -p Command-Line Format --passwd=password Introduced 5.7.19-ndb-7.6.3 Removed 5.7.20-ndb-7.6.4 Type String Default Value NULL Connect to a MySQL Server using this password and the MySQL user specified by --user. ndb_top displays ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-storage-layout.html
Use the VARCHAR data type instead of CHAR to store variable-length strings or for columns with many NULL values. A CHAR(N) column always takes N characters to store data, even if the string is shorter or its value is NULL. Once your data reaches a ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-accounts-table.html
This is NULL for an internal thread, or for a user session that failed to authenticate. This is NULL for an internal thread, or for a user session that failed to authenticate. The accounts table contains a row for each account that has connected to ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-atom-molecule-events.html
For example, a row fetch might result in rows like this: Row# EVENT_NAME TIMER_START TIMER_END ---- ---------- ----------- --------- 1 wait/io/file/myisam/dfile 10001 10002 2 wait/io/table/sql/handler 10000 NULL The row fetch causes a file read. In ... For a table I/O event, there are usually two rows in events_waits_current, not ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-stages-current-table.html
END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the event ends. If an event is produced from an instrument that has TIMED = NO, timing information is not collected, and TIMER_START, ...The table stores one row per thread showing the current status of the thread's most recent monitored stage event, so there is no system variable for configuring the table ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-mutex-instances-table.html
LOCKED_BY_THREAD_ID When a thread currently has a mutex locked, LOCKED_BY_THREAD_ID is the THREAD_ID of the locking thread, otherwise it is NULL. When a thread unlocks a mutex, mutex_instances shows that the mutex now has no owner (the THREAD_ID ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-performance-timers-table.html
The rows that do not contain NULL indicate which timers you can use in setup_timers. For an explanation of how event timing occurs, see Section 25.4.1, “Performance Schema Event Timing”. Note As of MySQL 5.7.21, the Performance Schema ...