99 lines
2.4 KiB
SQL
99 lines
2.4 KiB
SQL
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-- Supabase Disk IO diagnostics for PolyWeather.
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-- Run sections independently if your project does not expose every stats view.
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-- 1) Tables with high sequential scan pressure.
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select
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schemaname,
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relname,
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seq_scan,
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seq_tup_read,
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idx_scan,
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n_tup_ins,
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n_tup_upd,
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n_tup_del,
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n_dead_tup
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from pg_stat_user_tables
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where schemaname = 'public'
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order by seq_tup_read desc
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limit 30;
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-- 2) Largest public tables and indexes.
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select
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relname,
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pg_size_pretty(pg_total_relation_size(relid)) as total_size,
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pg_size_pretty(pg_relation_size(relid)) as table_size,
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pg_size_pretty(pg_indexes_size(relid)) as index_size
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from pg_catalog.pg_statio_user_tables
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where schemaname = 'public'
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order by pg_total_relation_size(relid) desc
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limit 30;
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-- 3) Slow/high-read statements, if pg_stat_statements is available.
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select
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calls,
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round(total_exec_time::numeric, 2) as total_exec_ms,
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round(mean_exec_time::numeric, 2) as mean_exec_ms,
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rows,
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shared_blks_read,
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shared_blks_hit,
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temp_blks_read,
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temp_blks_written,
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left(query, 500) as query_sample
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from pg_stat_statements
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order by shared_blks_read desc, total_exec_time desc
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limit 30;
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-- 4) Dead tuple pressure that can trigger heavier autovacuum work.
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select
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schemaname,
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relname,
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n_live_tup,
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n_dead_tup,
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last_vacuum,
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last_autovacuum,
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last_analyze,
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last_autoanalyze
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from pg_stat_user_tables
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where schemaname = 'public'
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order by n_dead_tup desc
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limit 30;
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-- 5) Indexes that still read the most disk blocks.
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select
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s.schemaname,
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s.relname,
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s.indexrelname,
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s.idx_scan,
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s.idx_tup_read,
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s.idx_tup_fetch,
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io.idx_blks_read,
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io.idx_blks_hit,
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pg_size_pretty(pg_relation_size(s.indexrelid)) as index_size
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from pg_stat_user_indexes s
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join pg_statio_user_indexes io
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on io.indexrelid = s.indexrelid
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where s.schemaname = 'public'
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order by io.idx_blks_read desc, s.idx_scan desc
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limit 50;
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-- 6) Large non-unique indexes with no recorded scans since stats reset.
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-- Treat this as a candidate list only; confirm with production traffic history
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-- before dropping anything.
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select
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s.schemaname,
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s.relname,
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s.indexrelname,
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s.idx_scan,
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pg_size_pretty(pg_relation_size(s.indexrelid)) as index_size,
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i.indisunique,
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i.indisprimary
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from pg_stat_user_indexes s
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join pg_index i
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on i.indexrelid = s.indexrelid
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where s.schemaname = 'public'
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and s.idx_scan = 0
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and not i.indisprimary
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and not i.indisunique
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order by pg_relation_size(s.indexrelid) desc
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limit 30;
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