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https://dev.mysql.com/doc/refman/5.7/en/problems-with-null.html
For example, the following statements are completely different: mysql> INSERT INTO my_table (phone) VALUES (NULL); mysql> INSERT INTO my_table (phone) VALUES (''); Both statements insert a value into the phone column, but the first inserts a NULL ...
https://dev.mysql.com/doc/refman/5.7/en/mrr-optimization.html
Reading rows using a range scan on a secondary index can result in many random disk accesses to the base table when the table is large and not stored in the storage engine's cache. The MRR optimization is not supported with secondary indexes ...
https://dev.mysql.com/doc/refman/5.7/en/show-slave-status.html
Seconds_Behind_Master This field is an indication of how “late” the replica is: When the replica is actively processing updates, this field shows the difference between the current timestamp on the replica and the original timestamp logged on ...
https://dev.mysql.com/doc/refman/5.7/en/charset-binary-collations.html
This section describes how the binary collation for binary strings compares to _bin collations for nonbinary strings. Binary strings (as stored using the BINARY, VARBINARY, and BLOB data types) have a character set and collation named binary.
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-full-table-scans.html
By default, rows are sorted by descending percentage of time a full scan was done and descending total latency. total_latency The total wait time of timed statement events for the statement. no_index_used_count The total number of times no index was ... These views display normalized statements that have done full table ...
https://dev.mysql.com/doc/refman/5.7/en/explain-extended.html
<cache>(expr) The expression (such as a scalar subquery) is executed once and the resulting value is saved in memory for later use. For SELECT statements, the EXPLAIN statement produces extra (“extended”) information that is not part of EXPLAIN ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-compared.html
Since both NDB and InnoDB can serve as transactional MySQL storage engines, users of MySQL Server sometimes become interested in NDB Cluster. MySQL Server offers a number of choices in storage engines. They see NDB as a possible alternative or ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-failure-detection.html
If a member does not receive messages from another member for 5 seconds, it suspects that the member has failed, and lists the status of that member as UNREACHABLE in its own Performance Schema table replication_group_members. If a suspicion lasts ... Group Replication’s failure detection mechanism is a distributed service which is able to identify that a server in the group is not communicating with the others, and is therefore suspected of being out of ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-replication.html
mysql> CHANGE MASTER TO MASTER_HOST='localhost', MASTER_USER='root', MASTER_PASSWORD='', MASTER_PORT = 13000, MASTER_LOG_FILE='0.000001, MASTER_LOG_POS=114; Start the replica. mysql> START SLAVE; If the error log prints output similar to the ...
https://dev.mysql.com/doc/refman/5.7/en/set-transaction.html
If executed between transactions, the statement overrides any preceding statement that sets the next-transaction value of the named characteristics. The statement is not permitted within transactions: mysql> START TRANSACTION; Query OK, 0 rows ...