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https://dev.mysql.com/doc/refman/5.7/en/show-processlist.html
row *************************** Id: 1 User: system user Host: db: NULL Command: Connect Time: 1030455 State: Waiting for master to send event Info: NULL *************************** 2. row *************************** Id: 2 User: system user Host: db: ... SHOW [FULL] PROCESSLIST The MySQL process list indicates the operations currently being performed by the set of threads executing within the ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-nutshell.html
JSON values are not stored as strings, instead using an internal binary format that permits quick read access to document elements. This function also works with a string that can be parsed as a JSON value. This function also accepts a valid string ... This section summarizes what has been added to, deprecated in, and removed from MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-relation-functions-mbr.html
MBRCoveredBy() handles its arguments as follows: If either argument is NULL or an empty geometry, the return value is NULL. If either argument is not a syntactically well-formed geometry byte string, an ER_GIS_INVALID_DATA error occurs. MBRCovers() ... MySQL provides several MySQL-specific functions that test the relationship between minimum bounding rectangles (MBRs) of two geometries g1 and ...
https://dev.mysql.com/doc/refman/5.7/en/scalar-subqueries.html
A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those characteristics that all operands have: a data type, a length, an indication that it can be ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-processlist-table.html
row *************************** ID: 5 USER: event_scheduler HOST: localhost DB: NULL COMMAND: Daemon TIME: 137 STATE: Waiting on empty queue INFO: NULL *************************** 2. row *************************** ID: 9 USER: me HOST: ... Note The ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-file-reading.html
A successful call to audit_log_read() to read events returns a JSON string containing an array of audit events: If the final value of the returned array is not a JSON null value, there are more events following those just read and audit_log_read() ...audit_log_read() takes an optional JSON string argument, and the result returned from a successful call to either function is a JSON ...
https://dev.mysql.com/doc/refman/5.7/en/mysqlbinlog-row-events.html
# at 218 #080828 15:03:08 server id 1 end_log_pos 258 Write_rows: table id 17 flags: STMT_END_F BINLOG ' fAS3SBMBAAAALAAAANoAAAAAABEAAAAAAAAABHRlc3QAAXQAAwMPCgIUAAQ= fAS3SBcBAAAAKAAAAAIBAAAQABEAAAAAAAEAA//8AQAAAAVhcHBsZQ== '/*!*/; ### INSERT INTO ...
https://dev.mysql.com/doc/refman/5.7/en/limit-optimization.html
row *************************** id: 1 select_type: SIMPLE table: t partitions: NULL type: range possible_keys: i key: i key_len: 8 ref: NULL rows: 14 filtered: 100.00 Extra: Using index condition; Using filesort See also Section 8.9.2, “Switchable ... If you need only a specified number of rows from a result set, use a LIMIT clause in the query, rather than fetching the whole result set and throwing away the extra ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-list.html
Note In MySQL 5.7, it is possible to match against only a list of integers (and possibly NULL—see Section 22.2.7, “How MySQL Partitioning Handles NULL”) when partitioning by LIST. List partitioning in MySQL is similar to range partitioning in ...
https://dev.mysql.com/doc/refman/5.7/en/memory-storage-engine.html
(This is an uncommon feature for implementations of hash indexes.) Columns that are indexed can contain NULL values. To replicate this effect to replicas, the first time that the source uses a given MEMORY table after startup, it logs an event that ... The MEMORY storage engine (formerly known as HEAP) creates special-purpose tables with contents that are stored in ...