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https://dev.mysql.com/doc/refman/9.7/en/spatial-type-overview.html
MySQL has spatial data types that correspond to OpenGIS classes. The basis for these types is described in Section 13.4.2, “The OpenGIS Geometry Model”. Some spatial data types hold single geometry values: GEOMETRY POINT LINESTRING POLYGON ...
https://dev.mysql.com/doc/refman/9.7/en/static-format.html
NULL columns require additional space in the row to record whether their values are NULL. Each NULL column takes one bit extra, rounded up to the nearest byte. The expected row length in bytes for static-sized rows is calculated using the following ...It is used when the table contains no variable-length columns (VARCHAR, VARBINARY, BLOB, or ...
https://dev.mysql.com/doc/refman/9.7/en/sys-ps-trace-thread.html
Use NULL to collect data for the default of 60 seconds. Dumps all Performance Schema data for an instrumented thread to a .dot formatted graph file (for the DOT graph description language). Each result set returned from the procedure should be used ...
https://dev.mysql.com/doc/refman/9.7/en/using-innodb-tables.html
row *************************** Name: t1 Engine: InnoDB Version: 10 Row_format: Dynamic Rows: 0 Avg_row_length: 0 Data_length: 16384 Max_data_length: 0 Index_length: 0 Data_free: 0 Auto_increment: NULL Create_time: 2021-02-18 12:18:28 Update_time: ... InnoDB tables are created using the CREATE TABLE statement; for example: CREATE TABLE t1 (a INT, b CHAR (20), PRIMARY KEY (a)) ENGINE=InnoDB; The ENGINE=InnoDB clause is not required when InnoDB is defined as the default storage engine, which it is by ...
https://dev.mysql.com/doc/refman/9.7/en/analyze-table.html
row *************************** SCHEMA_NAME: h TABLE_NAME: t COLUMN_NAME: c1 HISTOGRAM: {"buckets": [], "data-type": "int", "auto-update": false, "null-values": 0.0, "collation-id": 8, "last-updated": "2024-03-26 16:54:43.674995", "sampling-rate": ...ANALYZE [NO_WRITE_TO_BINLOG | LOCAL] TABLE tbl_name UPDATE HISTOGRAM ON col_name [, col_name] ...
https://dev.mysql.com/doc/refman/9.7/en/atomic-ddl.html
An atomic DDL statement combines the data dictionary updates, storage engine operations, and binary log writes associated with a DDL operation into a single, atomic operation. The operation is either committed, with applicable changes persisted to ...
https://dev.mysql.com/doc/refman/9.7/en/audit-api-message-emit.html
Each value can be a string or numeric value, or NULL. Example: mysql> SELECT audit_api_message_emit_udf('component_text', 'producer_text', 'message_text', 'key1', 'value1', 'key2', 123, 'key3', NULL) AS 'Message'; +---------+ | Message | +---------+ ... The audit_api_message_emit component enables applications to add their own message events to the audit log, using the audit_api_message_emit_udf() ...
https://dev.mysql.com/doc/refman/9.7/en/bnl-bka-optimization.html
Each row from the buffer that does not have its match flag enabled is extended by NULL complements (NULL values for each column in the second operand) and sent for further extensions by the remaining join operations. In MySQL, a Batched Key Access ...
https://dev.mysql.com/doc/refman/9.7/en/charset-collation-coercibility.html
NULL or an expression that is derived from NULL has a coercibility of 6. In the great majority of statements, it is obvious what collation MySQL uses to resolve a comparison operation. For example, in the following cases, it should be clear that ...
https://dev.mysql.com/doc/refman/9.7/en/checksum-table.html
If you run CHECKSUM TABLE against a view, the Checksum value is always NULL, and a warning is returned. For a nonexistent table, CHECKSUM TABLE returns NULL and generates a warning. If the table does not meet all these conditions, the QUICK method ...[QUICK | EXTENDED] CHECKSUM TABLE reports a checksum for the contents of a ...