YAGP Hooks Collector

An extension for collecting greenplum query execution metrics and reporting them to an external agent.

Collected Statistics

1. Query Lifecycle

• What: Captures query text, normalized query text, timestamps (submit, start, end, done), and user/database info.
• GUC: yagpcc.enable.

2. EXPLAIN data

• What: Triggers generation of the EXPLAIN (TEXT, COSTS, VERBOSE) and captures it.
• GUC: yagpcc.enable.

3. EXPLAIN ANALYZE data

• What: Triggers generation of the EXPLAIN (JSON, ANALYZE, BUFFERS, TIMING, VERBOSE) and captures it.
• GUCs: yagpcc.enable, yagpcc.min_analyze_time, yagpcc.enable_cdbstats(ANALYZE), yagpcc.enable_analyze(BUFFERS, TIMING, VERBOSE).

4. Other Metrics

• What: Captures Instrument, Greenplum, System, Network, Interconnect, Spill metrics.
• GUC: yagpcc.enable.

General Configuration

• Nested Queries: When yagpcc.report_nested_queries is false, only top-level queries are reported from the coordinator and segments, when true, both top-level and nested queries are reported from the coordinator, from segments collected as aggregates.
• Data Destination: All collected data is sent to a Unix Domain Socket. Configure the path with yagpcc.uds_path.
• User Filtering: To exclude activity from certain roles, add them to the comma-separated list in yagpcc.ignored_users_list.
• Trimming plans: Query texts and execution plans are trimmed based on yagpcc.max_text_size and yagpcc.max_plan_size (default: 1024KB). For now, it is not recommended to set these GUCs higher than 1024KB.