Database operational contract

MySQL 8.4 START SLAVE removed syntax error START REPLICA official docs

Replication automation fails with SQL syntax error on the new server.

search-observedMySQL 8.4Relational databaseDatabase operational contractmysql84

Agent Quick Fix

The local schema/query is valid, but upgrade path, restart behavior, replication syntax, or background operations changed in the server release.

Product: MySQL 8.4
Current-contract area: START SLAVE removed in MySQL 8.4
Likely root cause: Replication automation fails with SQL syntax error on the new server.
Repair direction: Verifier checks durability, restart, and operational safety rather than a one-shot query. Check operational state and security, not a compatibility switch that weakens the server.

Validation Status

Codex searched organically in the validation run. No no-web counterfactual is attached to this page yet.

Symptom

Replication automation fails with SQL syntax error on the new server.

Why This Happens

The local schema/query is valid, but upgrade path, restart behavior, replication syntax, or background operations changed in the server release.

Verification

Verifier checks durability, restart, and operational safety rather than a one-shot query. Check operational state and security, not a compatibility switch that weakens the server.

Common Wrong Fixes

Changing local code without checking the current external contract.
Retrying the same install, build, or API call with no version/source change.
Applying a broad unsafe bypass when a narrow compatibility fix is available.

Codex Search Keywords

These are the search terms observed in a neutral Codex validation run for this failure shape.

MySQL 8.4 START SLAVE removed syntax error START REPLICA official docs
site:dev.mysql.com/doc/refman/8.4 START SLAVE START REPLICA
MySQL 8.4 START REPLICA manual
https://dev.mysql.com/doc/refman/8.4/en/start-replica.html
https://dev.mysql.com/doc/refman/8.0/en/start-slave.html
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-0.html