MySQL raises error 3076 when a replication channel name is invalid or exceeds 64 characters.
ER_SLAVE_CHANNEL_NAME_INVALID_OR_TOO_LONG appears when a CHANGE MASTER or START SLAVE statement uses an invalid or over-length channel name. Use only alphanumeric and underscore characters and keep the name under 64 characters to resolve the problem.
ER_SLAVE_CHANNEL_NAME_INVALID_OR_TOO_LONG
Error 3076 appears when a CHANGE MASTER TO, START SLAVE, or STOP SLAVE statement references a replication channel name that MySQL considers invalid or longer than 64 characters. Since MySQL 5.7.6 multiple replication channels are allowed, and each must follow strict naming limits. Fixing the name lets the command run.
A broken replication channel prevents data synchronization between source and replica, causing lag and potential data inconsistency. Production systems relying on near real time replication can experience stale reads and failover risk until the error is cleared.
The server validates channel names against an internal rule set. Any character outside [0-9A-Za-z_], an empty string, a duplicate existing name, or a name longer than 64 bytes triggers error 3076.
Rename the channel so it is unique, under 64 characters, and uses only alphanumeric or underscore characters. Then rerun the CHANGE MASTER or START SLAVE statement. Full steps appear below.
Automation scripts that build channel names from hostnames often exceed 64 characters. Truncate the generated string or hash it. Scripts that inject hyphens or spaces produce invalid characters; replace them with underscores. When cloning servers the old channel may still exist; use RESET SLAVE ALL FOR CHANNEL 'old_name' before creating the new one.
Use a predictable naming convention limited to 40 characters, prefix project name, and store validation in deployment scripts. Run SHOW SLAVE STATUS periodically and alert on replication errors. Galaxy editors can keep endorsed snippets that include validated channel names, preventing typos in production changes.
See error 3077 ER_SLAVE_CHANNEL_DELETE for issues when dropping channels, and 3168 ER_CHANGE_MASTER_INVALID_PARAMETER for invalid CHANGE MASTER clauses. Fixes are similar: correct the statement syntax or parameters.
Channel names can only contain alphanumeric characters and underscore. Any space, dash, or symbol will raise error 3076 on creation.
MySQL limits channel_name to 64 bytes. Scripts that concatenate hostnames or timestamps may go over the limit and fail.
Trying to create a channel that already exists produces the same error because the server treats the duplicate as invalid.
If the CHANNEL clause is empty or missing a value, MySQL uses an empty string which violates the naming rules.
Raised when attempting to delete a replication channel that is still running.
Occurs if CHANGE MASTER TO includes unknown or duplicate parameters.
Indicates invalid master information rows which can appear after improper channel creation.
No. Only letters, numbers, and underscore are allowed.
64 characters starting from MySQL 5.7.6.
It prevents creation or start of the specified channel but other channels continue unaffected.
Galaxy lets teams store validated CHANGE MASTER snippets so future edits reuse the correct channel name, reducing typos.
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