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Fixes slow PostgreSQL full-text search on a GIN index: expression mismatch that makes the planner ignore the index, pending-list bloat on write-heavy tables, fuzzy result sets capped with gin_fuzzy_search_limit, and ts_rank costing inside a LIMIT subquery. Use when a @@ query on a tsvector GIN column runs a sequential…
Fixes a migration stuck waiting on an AccessExclusiveLock held by a long-running analytics query. It shows how to identify the blocking query with pg_blocking_pids, inspect it, terminate it safely, and re-run the migration. Use when DDL will not start and pg_stat_activity shows a lock wait.
Fixes query plans that are fast in test but slow in production because the planner statistics are weeks out of date. Use when EXPLAIN shows a sane plan on the test database but a bad one in production for the same query. Key trigger: pg_stat_user_tables shows last_analyze weeks old on the slow tables.
Fixes Postgres FATAL: sorry, too many clients already via psycopg2. Use when new connections are refused, when connection count hits max_connections, or when an agent spawns connections without pooling. Not for auth failures, for slow queries, or for pool exhaustion inside one app.
Diagnoses a database connection failure with connection timeout symptoms: Postgres 'could not connect to server: Connection timed out' across psql, libpq drivers, and managed hosts. Use when the client cannot reach the server: fail-fast probing with connect_timeout, layering DNS vs raw TCP vs handshake for network dia…
Vectle found the following relevant skills: - Parallel MCP: pinned source_policy overrides apply to every web_search on the connection - Postgres MCP: canceling statement due to statement timeout (30s default)
Troubleshooting guide for duplicate-query detectors that trip on prepared statements because each execution is logged with its bind params as if it were a separate query. Use when the alert groups executions that share one statement template. Shows how to normalize by template, tell a real per-row loop from a single b…
Vectle found the following relevant skills: - Parallel MCP: pinned source_policy overrides apply to every web_search on the connection - [Azure Cognitive Search: SearchResourceEncryptionKey raises 'not iterable' error during data source connecti…
Vectle found the following relevant skills: - Parallel MCP: pinned source_policy overrides apply to every web_search on the connection - [Azure Cognitive Search: SearchResourceEncryptionKey raises 'not iterable' error during data source connecti…
Shows how to set up pg_stat_statements for Postgres query monitoring. Use it when you need to find slow queries, when setting up a new database, or when query stats look empty. Not for real-time process inspection.
Vectle found the following relevant skills: - Tembo Postgres monitoring needs pg_stat_statements or it silently does nothing - SearchApi: always check search_metadata.status before trusting the body
Vectle found the following relevant skills: - Fixing new row violates row-level security policy on INSERT: WITH CHECK vs USING - Algolia: search() caps at 1000 hits - use browse() for full index retrieval
Shows how to find the slowest queries in Postgres using pg_stat_statements. Use when the database feels slow and you need the actual worst queries, when you want total-time vs per-call rankings, or when deciding what to optimize first. Not for real-time blocking, for deadlocks, or for query slowness caused by connecti…
Vectle found the following relevant skills: - Elasticsearch large queries die with empty reply: heap, not the query - Tenant log search syntax: query filters that find the exact failure
Diagnoses Postgres queries where a long-running query blocks DDL. Use when ALTER TABLE or CREATE INDEX hangs, when pg_stat_activity shows waiting locks, or when you need to find and deal with the blocker. Not for autovacuum bloat, for upsert syntax, or for slow queries that are not blocking anything.