<p>The master delay value you set in CHANGE MASTER TO or START SLAVE exceeds the maximum allowed by MySQL.</p>
<p>MySQL Error 1729: ER_MASTER_DELAY_VALUE_OUT_OF_RANGE appears when the DELAY value in CHANGE MASTER TO or START SLAVE is larger than the server’s max value (2^31-1 seconds). Use a delay within range or adjust code to comply; the simplest fix is to pick a smaller DELAY value.</p>
The requested value %s for the master delay exceeds the
Error 1729 fires when you configure a delayed replication slave and specify a DELAY that exceeds MySQL’s hard limit of 2147483647 seconds (about 68 years). The server rejects the statement and stops applying the setting.
The error can surface in CHANGE MASTER TO, START SLAVE UNTIL, or replication channel creation. It blocks replication changes until corrected, so resolving it quickly keeps replicas in sync.
The most common trigger is a typo or miscalculation when setting MASTER_DELAY. Another cause is using variables or automation that produce unexpectedly large integers. Version mismatches can also matter; older clients may default to out-of-range numbers.
Choose a DELAY value no greater than 2147483647. Issue CHANGE MASTER TO MASTER_DELAY = n where n is within range, then restart replication. If automation produces values, add validation logic.
Dev teams often schedule a 24-hour (86400-second) delay but accidentally multiply units twice, yielding 7464960000. Correct the unit conversion and run CHANGE MASTER TO again.
Infrastructure tools that read YAML may parse 1d as 86400 then append another 86400. Double-check parsing pipelines and clamp the final value.
Validate delay inputs in CI/CD scripts. Store delays in seconds, not mixed units. Monitor replication channel status and alert on errors. Use Galaxy’s query history to audit CHANGE MASTER statements before deployment.
Errors 1201 (ER_SLAVE_THREAD), 1872 (ER_SLAVE_CHANNEL_DOES_NOT_EXIST), and 1794 (ER_SLAVE_CHANNEL_NAME_INVALID_OR_TOO_LONG) often appear during replication setup. Similar troubleshooting steps apply: verify parameters and limits.
A misplaced extra zero multiplies the intended delay and blows past the limit.
Mixing minutes, hours, and seconds in code can inflate the final integer.
Configuration management tools may concatenate values or misinterpret strings.
Old shell or Perl scripts built for MySQL 5.5 might not validate limits now enforced in 8.x.
Occurs when slave thread fails to start; often follows invalid parameters.
Raised when referencing a non-existent replication channel.
Appears when channel names exceed 64 characters or contain illegal symbols.
The upper limit is 2147483647 seconds, equivalent to 68 years.
No. The limit is hard-coded as a signed 32-bit integer.
The statement fails but existing threads continue with previous settings.
Galaxy’s AI copilot flags out-of-range literals during code review, reducing misconfigurations.
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