<p>The GTID set string supplied in a statement or server variable is not correctly formatted, preventing MySQL from parsing it.</p>
<p>MySQL Error 1773 ER_MALFORMED_GTID_SET_ENCODING occurs when the GTID set string passed to commands like SET @@GLOBAL.gtid_purged is not in valid UUID:transaction_id format. Correct or regenerate the GTID set before rerunning the statement to resolve the issue.</p>
Malformed GTID set encoding.
MySQL raises error 1773 with message "Malformed GTID set encoding" when it encounters a Global Transaction Identifier (GTID) set that does not follow the required syntax rules.
The failure prevents statements such as SET @@GLOBAL.gtid_purged, SET GTID_NEXT, CHANGE MASTER TO, or START REPLICA from executing, halting replication setup or point in time recovery tasks until the GTID string is fixed.
The error appears most often during replication configuration when administrators copy a GTID set from another server and paste it into SQL. If the string contains extra spaces, an invalid UUID, missing colons, overlapping intervals, or trailing commas, MySQL rejects it.
Application code that dynamically alters @@SESSION.gtid_next can also generate malformed sets when it concatenates empty elements or duplicates transaction ranges.
First, capture the exact GTID string reported by MySQL. Validate its syntax manually or with functions such as GTID_SUBTRACT that parse GTID sets.
Edit the string so each element uses UUID:transaction_id or UUID:interval_start-interval_end format without whitespace. If the correct set is unknown, regenerate it by running SHOW MASTER STATUS on the source or using mysqlbinlog with the --gtid-to-file-pos option.
During a dump restore, a broken line wrap in the SET @@GLOBAL.gtid_purged statement injects a newline into the GTID set. Remove the newline and reimport the dump.
While running CHANGE MASTER TO, copying output from SHOW SLAVE STATUS may include a trailing comma. Delete the comma before executing the command to allow replication to start.
Always copy GTID sets directly from SHOW commands inside the mysql client, ensuring your terminal does not wrap long lines. Store sets in version controlled scripts and validate them with automated checks that run SELECT GTID_SUBTRACT() before deployment.
Galaxy's modern SQL editor highlights malformed GTID strings in real time, letting you correct issues locally before they reach production servers.
Error 1772 ER_MALFORMED_GTID_SET_SPECIFICATION reports an invalid GTID interval specification. Fix by ensuring interval ranges are continuous and properly separated by colons and dashes.
Error 1790 ER_MASTER_FATAL_ERROR_READING_BINLOG indicates replication stopped because of a corrupted or inconsistent binary log. Rebuild the replica from a fresh backup or use mysqlbinlog to skip damaged events.
The server UUID section is not 36 hexadecimal characters separated by hyphens, so MySQL cannot match it to a server identifier.
The delimiter separating the UUID and the first transaction value is absent, causing the parser to fail immediately.
A range like 100-50 or two overlapping ranges within the same UUID results in malformed encoding.
Copying GTID sets through terminals or text editors may introduce hidden characters that break the strict grammar.
Indicates illegal interval syntax such as missing dash or reversed numbers.
Replication stopped due to unreadable binary log; may follow malformed GTID operations.
Occurs when SET GTID_NEXT is given a group that does not exist or is improperly encoded.
No. MySQL requires valid GTID syntax whenever GTID mode is ON. Disabling checks would corrupt replication consistency.
Yes, if you manually execute SET @@GLOBAL.gtid_purged or SET GTID_NEXT on a standalone server with an invalid string.
Galaxy highlights invalid GTID strings in the editor, offers AI fixes, and lets teams peer review scripts before deployment.
The check exists in all MySQL 5.6+ releases that support GTIDs, though later versions add stricter validation.
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