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Handle division by zero possibility

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* When no I/O activity has been reported in pg_statio_all_tables for a
  database, the queries resulted in a division by zero. Cange this to a
  NULL instead.  Still a problem for Zabbix, but maybe a little cleaner.
This commit is contained in:
James Campbell 2025-06-17 01:16:57 -04:00
parent b981a9ad36
commit 9225e745b0
Signed by: james
GPG Key ID: 2287C33A40DC906A
1 changed files with 1 additions and 1 deletions
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sample-config/pgmon-metrics.yml
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@ -38,7 +38,7 @@ metrics:
hit_ratios:
type: row
query:
0: SELECT sum(heap_blks_read)::float / sum(heap_blks_read + heap_blks_hit) AS avg_heap_hit_ratio, sum(idx_blks_hit)::float / sum(idx_blks_read + idx_blks_hit) AS avg_idx_hit_ratio, sum(toast_blks_hit)::float / sum(toast_blks_read + toast_blks_hit) AS avg_toast_hit_ratio, sum(tidx_blks_hit)::float / sum(tidx_blks_read + tidx_blks_hit) AS avg_tidx_hit_ratio FROM pg_statio_all_tables
0: SELECT sum(heap_blks_read)::float / NULLIF(sum(heap_blks_read + heap_blks_hit), 0) AS avg_heap_hit_ratio, sum(idx_blks_hit)::float / NULLIF(sum(idx_blks_read + idx_blks_hit), 0) AS avg_idx_hit_ratio, sum(toast_blks_hit)::float / NULLIF(sum(toast_blks_read + toast_blks_hit), 0) AS avg_toast_hit_ratio, sum(tidx_blks_hit)::float / NULLIF(sum(tidx_blks_read + tidx_blks_hit), 0) AS avg_tidx_hit_ratio FROM pg_statio_all_tables
# Debugging
ntables: