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https://dev.mysql.com/doc/refman/8.0/en/is-null-optimization.html
This optimization does not occur in cases when the column might produce NULL anyway (for example, if it comes from a table on the right side of a LEFT JOIN). MySQL can perform the same optimization on col_name IS NULL that it can use for col_name = ...
https://dev.mysql.com/doc/refman/8.0/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/8.0/en/manual-info.html
If you have questions about using MySQL, join the MySQL Community Slack. This is the Reference Manual for the MySQL Database System, version 8.0, through release 8.0.40. Differences between minor versions of MySQL 8.0 are noted in the present text ...
https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html
ABS(X) Returns the absolute value of X, or NULL if X is NULL. An implication of this is that ABS(-9223372036854775808) produces an error because the result cannot be stored in a signed BIGINT value. mysql> SELECT ABS(2); -> 2 mysql> SELECT ABS(-32); ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndb-innodb-workloads.html
NDB Cluster has a range of unique attributes that make it ideal to serve applications requiring high availability, fast failover, high throughput, and low latency. Due to its distributed architecture and multi-node implementation, NDB Cluster also ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-counters.html
The LOCAL_TABLE_SCANS_SENT, READS_RECEIVED, PRUNED_RANGE_SCANS_RECEIVED, RANGE_SCANS_RECEIVED, LOCAL_READS_SENT, CONST_PRUNED_RANGE_SCANS_RECEIVED, LOCAL_RANGE_SCANS_SENT, REMOTE_READS_SENT, REMOTE_RANGE_SCANS_SENT, READS_NOT_FOUND, ... The counters ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-dict-obj-info.html
The dict_obj_info table provides information about NDB data dictionary (DICT) objects such as tables and indexes. (The dict_obj_types table can be queried for a list of all the types.) This information includes the object's type, state, parent ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-operations-per-fragment.html
tot_scan_bytes_returned includes, in the case of pushed joins, projections returned to the DBSPJ block in the NDB kernel. The operations_per_fragment table provides information about the operations performed on individual fragments and fragment ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-online-add-node-example.html
In this section we provide a detailed example illustrating how to add new NDB Cluster data nodes online, starting with an NDB Cluster having 2 data nodes in a single node group and concluding with a cluster having 4 data nodes in 2 node groups.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-privilege-synchronization.html
Whenever a MySQL server starts up and joins the cluster as an SQL node it executes these stored CREATE USER and GRANT statements as part of the cluster schema synchronization process. NDB 8.0 introduces a new mechanism for sharing and synchronizing ...