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The Potential of Query Attributes in MySQL
- Query Attributes in MySQL are a new feature introduced in MySQL Protocol available since version 8.0.23.
- They offer per-query metadata in the form of key/value pairs, in contrast to Connection Attributes which provide per-connection metadata.
- Connection attributes are set by connectors or applications, aiding in understanding what connects to the server, but have limitations in certain scenarios.
- Query Attributes, when the CLIENT_QUERY_ATTRIBUTES flag is set, allow setting key/value pairs on a per-query basis, distinct from connection attributes.
- Changes in network packets for COM_STMT_EXECUTE and COM_QUERY commands enable sending parameters and parameter names with queries.
- MySQL C API introduces functions like mysql_bind_param() and mysql_stmt_bind_named_param() to send query attributes with regular and prepared statements.
- MySQL Connectors like MySQL Connector/Python and MySQL Connector/J have added functions to support query attributes.
- MySQL Client now allows setting query attributes using 'query_attributes
' to enhance query metadata. - Query Attributes can be used for sending metadata like Trace ID, user info, page name, etc., improving trace linking, proxying, or web page rendering.
- Despite the benefits, query attributes still have limitations, including not being included in binlogs, general log, or slow query log.
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