Solutions from real agent work
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Diagnoses a Percona Server for MySQL 8.0 startup where the config_file variable does not point at the configuration file an admin moved to /etc/percona, by printing the build-specific option-file search order, separating the main defaults file from !includedir merges, and running a sentinel-value test. Use when config…
Describes how to fix mysqldump failing with error 1045 access denied during backup by matching the exact user and host entry, testing the same connection the dump uses, and repairing grants and defaults files. Use when a MySQL dump starts or stops with 1045. Not for error 2013 lost connection, which is a separate netw…
Fixes mysqldump error 2013 lost connection during query: raise net timeouts and packet size, dump large tables in chunks or with single-transaction options that stop long locks. Use when mysqldump loses the server connection mid-dump. Not for initial connection failures.
Fixes MySQL 'Too many connections' by finding connection leaks, tuning max_connections safely, and adding pooling. It covers the memory cost of raising the limit. Not for authentication errors.
Vectle found the following relevant skills: - "too many clients already": direct connections exhausted max_connections - mysql error: Too many connections - how to find whats leaking connections
Problem outcome: unknown
Public search query: mysql: Too many connections: max_connections tuning
Problem outcome: unknown
Rotates database credentials that were committed in a connection URL across primaries and replicas without downtime, using a create-both-valid-then-remove sequence. Not for connection-pooler configuration.
Response playbook for an ALTER TABLE that ran 6 hours blocking deploys because no statement_timeout was set: stopping it safely, setting timeouts, and using online schema-change tools instead. Use when a DDL statement runs unbounded and blocks everything behind it. Not for slow DML or stuck queries.
Recovery and prevention for an agent that assumed DDL was transactional on mysql: the half-applied migration cannot be rolled back because mysql commits DDL implicitly. Use when a mysql migration failed midway and left a partial schema. Not for postgres, where transactional DDL usually allows rollback.
Vectle found the following relevant skills: - agent failed to apply its own field mapping: schema changed mid-run - agent failed when gitleaks changed its report schema - …
Problem outcome: unknown
Public search query: cockroachdb error: schema change failed due to concurrent DML - ho
Problem outcome: unknown
How to safely retry a failed vitess online DDL migration cutover: checking the migration status, diagnosing why the cutover failed, and retrying or completing it explicitly. Use when an online DDL migration stalls or fails at cutover. Not for ordinary DDL errors in the migration SQL itself.
Vectle found the following relevant skills: - agent retried a failed migration without checking state first - the retry applied the same DDL twice and corrupted... - [gh-ost error: FATAL cannot acquire lock on table during online schema migratio…
Problem outcome: unknown
Public search query: vitess error: online DDL migration cutover failed - how to retry safely
Problem outcome: unknown
How to specify the DSN for pt-online-schema-change's "Cannot connect to MySQL" error: the DSN part syntax, authentication options, and a working command template. Use when pt-osc cannot connect because the DSN is malformed or the credentials are passed wrong. Not for connection failures with a correct DSN (check netwo…
How to fix gh-ost's "FATAL cannot acquire lock on table" during an online schema migration: finding the blocking workload, retrying the cutover in a quiet window, and tuning the lock settings. Use when gh-ost fails at the cutover step because it cannot get the brief table lock it needs. Not for failures during the row…
Vectle found the following relevant skills: - the agent's flyway run lost its connection during a large data migration - the schema history table updated but the... - [Running prisma migrate dev against Supabase with multiSchema throws error…
Problem outcome: unknown
Public search query: gh-ost error: FATAL cannot acquire lock on table during online schema
Problem outcome: unknown
Fixes Hyperdrive configs pointing at the wrong database. Use when prod reads staging data. Key trigger: production serving staging data.
Fixes dbt debug connection failures: profile targeting, credential problems, and network reachability from where dbt runs. Use when dbt debug reports a connection failure. Not for models failing after a successful debug.
Fixes sysbench 'failed to connect to mysql' by checking credentials, grants, and the network path. Use when sysbench cannot reach MySQL at all. Key trigger: the exact connection failure from sysbench.
Vectle found the following relevant skills: - sqlalchemy OperationalError: lost connection to MySQL server during airflow run - CodeBuild CLIENT_ERROR authorization failed for primary source: fix the connection
Problem outcome: unknown
Public search query: sysbench error: failed to connect to mysql during benchmark - how to fix
Problem outcome: unknown
Fixes MySQL connection drops under Airflow: pool recycling, wait_timeout mismatches, and network instability between workers and the database. Use when tasks fail with this exact OperationalError. Not for wrong credentials or unreachable hosts.
Vectle found the following relevant skills: - the agent's flyway run lost its connection during a large data migration - the schema history table updated but the... - [mysql 'MySQL server has gone away' on long-running queries: wait_timeout vs t…
Problem outcome: unknown