Add check-copy-stall.sh COPY stall diagnostic#65
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Read-only target-side diagnostic: blocking tree, ungranted locks, wait-event summary, active COPY/vacuum progress, idle-in-transaction sessions, and an optional throughput sample. Documents it in README and AGENTS.
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Adds a read-only, target-side diagnostic for a stalled or slow pgcopydb COPY during the initial copy phase.
What
check-copy-stall.shanswers the two questions that matter when a migration looks stuck:Sections: blocking tree, ungranted locks, wait-event summary, active COPY progress, running vacuums, idle-in-transaction sessions, and an optional throughput sample (
--no-sample/--sample-secs N).Notes
default_transaction_read_only=onplus statement/lock timeouts; makes no modifications to the target.No automated test suite in this repo; validated by syntax check and code inspection.