<p>MySQL raises ER_MALFORMED_GTID_SPECIFICATION (error 1774) when a GTID set passed to commands like SET GLOBAL gtid_purged or START SLAVE is syntactically invalid.</p>
<p>MySQL Error 1774: ER_MALFORMED_GTID_SPECIFICATION occurs when the server receives an incorrectly formatted GTID set such as an empty UUID or missing sequence numbers. Correct the GTID syntax or regenerate the set to resolve the issue.</p>
Malformed GTID specification '%s'.
Error 1774 fires when MySQL parses a GTID set string and finds that it does not follow the expected UUID:interval format.
The error usually appears during replication setup or data import when commands such as SET GLOBAL gtid_purged, CHANGE MASTER TO, or START REPLICA receive the malformed GTID string.
MySQL uses Global Transaction Identifiers (GTIDs) to track replicated transactions. A bad GTID string prevents the server from determining the correct replication state, halting replica initialization and risking data divergence.
The error surfaces immediately after the offending command is executed, often at startup of a replica or during manual GTID purging, making early detection crucial to keep replication healthy.
Common causes include typos, missing colons, extra commas, empty intervals, negative numbers, or copying GTID sets from different MySQL versions with incompatible delimiters.
Validate the GTID string with SHOW VARIABLES LIKE 'gtid_executed'. Ensure each GTID element is formatted as UUID:low-high with no spaces, then rerun the command.
If importing a dump, regenerate gtid_purged using mysqldump --set-gtid-purged=ON. When cloning servers, capture a fresh GTID set from the source before applying it to the replica.
Automate GTID extraction, avoid manual editing, and validate GTID strings in a staging environment before production deployment. Galaxy's AI SQL editor helps by flagging malformed GTID syntax instantly.
Missing dashes in the UUID or misplaced colons create invalid GTID tokens.
A range specified as uuid:1- causes the parser to throw the error because the upper bound is missing.
GTID strings produced by older MySQL forks may use semicolons or mixed delimiters incompatible with current MySQL.
Hand-built GTID sets often omit required commas or duplicate UUID segments, leading to malformed input.
Indicates a replica cannot read the master's binary log, often following GTID issues.
Occurs when the binary log format is incompatible with GTID replication.
Signals that gtid_purged was modified while transactions existed in the binary log, blocking replication.
It is primarily a replication configuration error because it breaks GTID parsing, but it stems from incorrect GTID syntax.
Yes, but it removes GTID benefits. It is better to correct the GTID string.
Galaxy's SQL linter highlights malformed GTID strings immediately, reducing deployment risk.
No. The server will keep failing until a valid GTID specification is supplied.
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