The server value for a version token differs from the value required by the client, triggering a mismatch.
MySQL error 3136 ER_VTOKEN_PLUGIN_TOKEN_MISMATCH arises when a token value on the server does not match the value listed in the client's version_tokens_session variable. Align the token values on both sides or clear version_tokens_session to fix the mismatch quickly.
ER_VTOKEN_PLUGIN_TOKEN_MISMATCH
MySQL raises error 3136 when the Version Tokens plugin finds that the value of a named token on the server differs from the value required by the client. The client specifies its expected values in the session variable version_tokens_session. If any token name matches but the value does not, the server rejects the statement with ER_VTOKEN_PLUGIN_TOKEN_MISMATCH.
The error appears in MySQL 5.7.8 and later whenever applications rely on version tokens to guarantee consistency between replicated servers, rolling upgrades or online schema changes. Fixing it quickly prevents incorrect reads or writes during coordinated deployments.
The primary trigger is a mismatch between the numeric or string value stored for a token on the server and the value listed for that token inside the client's version_tokens_session variable. This usually happens after a deploy, schema migration or failover where the token was incremented on one server but not another.
Another cause is retaining stale token values in a connection pool. Long-lived sessions inherit an outdated version_tokens_session setting that no longer matches the server after maintenance, leading to the mismatch on the next statement execution.
First verify the current server token values using the performance schema table version_tokens. Compare them with the values in your session variable. If the server is correct, clear or update the session variable so that both sides agree.
If the client value is authoritative, update the server token with the Version Tokens API or a simple INSERT ... ON DUPLICATE KEY UPDATE into performance_schema.version_tokens to make the server agree with the client.
During blue-green deployments, each application server sets version_tokens_session before sending traffic. If traffic is routed to an older database replica, the mismatch appears. Use consistent orchestration to promote replicas only after their tokens are updated.
Connection pooling libraries may reuse sessions that were created before a failover. Issue SET version_tokens_session='' right after borrowing a connection or enable pool reset to avoid stale values.
Update tokens inside the same transaction that performs a schema change so replicas stay consistent. Always bump token values on all servers before routing clients.
For pooled connections, run SET version_tokens_session='' on checkout or configure the pool to issue a RESET SESSION command. Monitor performance_schema.version_tokens for drift and alert when replicas diverge.
ER_VTOKEN_PLUGIN_TOKEN_NOT_FOUND occurs when the client lists a token name that the server does not store. Unlike ER_VTOKEN_PLUGIN_TOKEN_MISMATCH, the token is missing instead of having a wrong value.
ER_VTOKEN_PLUGIN_TOKEN_DUPLICATE arises when duplicate token names appear in the server table. Purge duplicates to clear the error.
After a schema migration the primary server increments the token but replicas lag, so read traffic on the replica fails.
A session created before maintenance keeps the old version_tokens_session value and later executes statements against a newer server.
Administrators may insert an incorrect token value during manual fixes, breaking subsequent client checks.
Application code calculates or hard-codes an incorrect expected token value causing immediate mismatch.
The server does not contain a token listed in version_tokens_session. Add the token on the server or drop it from the session list.
Multiple rows exist for the same token name. Delete duplicates to restore uniqueness.
Generic catch-all for plugin failures when Version Tokens plugin is not loaded or fails to initialize.
Yes. Execute SET SESSION version_tokens_session='' to clear all checks for the current connection. Do this only if strong consistency is not required.
The error blocks the current statement only. Replication continues, but mismatched tokens signal configuration drift that can lead to data inconsistency if ignored.
Version Tokens plugin was introduced in MySQL 5.7.8. The error appears in 5.7 and all later versions that have the plugin enabled.
Galaxy's session reset feature runs SET commands on every new editor tab, ensuring version_tokens_session is fresh and preventing token mismatches before queries execute.
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