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Rebased. |
Postgres doesn't index the referencing side of a foreign key, so every row deleted from `blocks` scans `transactions`, `channeltxs` and `outputs` in full. Postgres was taking 100% CPU for multiple minutes, causing startup timeouts in systemd. 247aa13 and 50a8e32 added indices for `outputs` and `utxoset` in 2018. `channeltxs` (28feb2e) and `transactions` (0f89653) arrived weeks later without one. `outputs` is only half-covered: `output_height_idx` is (`confirmation_height`, `spend_height`), which doesn't serve a lookup on `spend_height` alone. Changelog-Fixed: db: much faster startup on postgres nodes with large `transactions` or `channeltxs` tables.
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Rebased. Any takers? I know you guys are busy. This was a startup hang blocker for us. |
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Add missing simple indexes.
Changelog-Fixed: db: much faster startup on postgres nodes with large
transactionsorchanneltxstables.Tested on a production node running into the issue described above (fixes it).