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https://dev.mysql.com/doc/refman/8.4/en/error-lost-connection.html
Usually it indicates network connectivity trouble and you should check the condition of your network if this error occurs frequently. If the error message includes “during query,” this is probably the case you are experiencing. Sometimes the ...
https://dev.mysql.com/doc/refman/8.4/en/extensions-to-ansi.html
MySQL Server supports some extensions that you are not likely to find in other SQL DBMSs. Be warned that if you use them, your code is most likely not portable to other SQL servers. For example, MySQL Server recognizes the STRAIGHT_JOIN keyword in ...
https://dev.mysql.com/doc/refman/8.4/en/federated-usagenotes.html
The following items indicate features that the FEDERATED storage engine does and does not support: The remote server must be a MySQL server. The remote table that a FEDERATED table points to must exist before you try to access the table through the ...
https://dev.mysql.com/doc/refman/8.4/en/fetching-spatial-data.html
Geometry values stored in a table can be fetched in internal format. Fetching spatial data in internal format: Fetching geometry values using internal format can be useful in table-to-table transfers: CREATE TABLE geom2 (g GEOMETRY) SELECT g FROM ...
https://dev.mysql.com/doc/refman/8.4/en/general-thread-states.html
The following list describes thread State values that are associated with general query processing and not more specialized activities such as replication. Many of these are useful only for finding bugs in the server. After create This occurs when ...
https://dev.mysql.com/doc/refman/8.4/en/gis-data-formats.html
Two standard spatial data formats are used to represent geometry objects in queries: Well-Known Text (WKT) format Well-Known Binary (WKB) format Internally, MySQL stores geometry values in a format that is not identical to either WKT or WKB format.
https://dev.mysql.com/doc/refman/8.4/en/gis-wkb-functions.html
These functions take as arguments a BLOB containing a Well-Known Binary (WKB) representation and, optionally, a spatial reference system identifier (SRID). For a description of WKB format, see Well-Known Binary (WKB) Format. Functions in this ...
https://dev.mysql.com/doc/refman/8.4/en/gone-away.html
This section also covers the related Lost connection to server during query error. The most common reason for the MySQL server has gone away error is that the server timed out and closed the connection. In this case, you normally get one of the ...
https://dev.mysql.com/doc/refman/8.4/en/hexadecimal-literals.html
Hexadecimal literal values are written using X'val' or 0xval notation, where val contains hexadecimal digits (0..9, A..F). Lettercase of the digits and of any leading X does not matter. A leading 0x is case-sensitive and cannot be written as 0X.
https://dev.mysql.com/doc/refman/8.4/en/information-schema-innodb-columns-table.html
For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”. The INNODB_COLUMNS table has these columns: TABLE_ID An identifier representing the table associated with the column; the same ...