DB Sync queries to measure slot gaps between blocks

Author: bwbush

analysis/mainnet-gaps.sql

@@ -0,0 +1,48 @@
+-- DB Sync queries to measure the number of slots between consecutive blocks.
+
+-- Tally gap distribution for past year.
+select
+    sum(case when gap_size > 5 * 60 then observations else 0 end) as "Gaps longer than 5 minutes"
+  , sum(case when gap_size between 4 * 60 and 5 * 60 - 1 then observations else 0 end) as "Gaps between 4 and 5 minutes"
+  , sum(case when gap_size between 3 * 60 and 4 * 60 - 1 then observations else 0 end) as "Gaps between 3 and 4 minutes"
+  , sum(case when gap_size between 2 * 60 and 3 * 60 - 1 then observations else 0 end) as "Gaps between 2 and 3 minutes"
+  , sum(case when gap_size between 1 * 60 and 2 * 60 - 1 then observations else 0 end) as "Gaps between 1 and 2 minutes"
+  , sum(case when gap_size < 1 * 60 then observations else 0 end) as "Gaps less than 1 minute"
+  from (
+    select
+        gap_size
+      , count(*) as observations
+      from (
+        select
+            slot_no
+          , slot_no - lag(slot_no) over (order by slot_no) as gap_size
+        from
+            block
+        where
+            epoch_no between 550 - 365 / 5 and 550
+      ) gaps
+      group by gap_size
+  ) histogram
+;
+
+-- List largest gaps in past year.
+select
+      slot_no
+    , slot_no - lag(slot_no) over (order by slot_no) as gap_size
+  from
+      block
+  where
+      epoch_no between 550 - 365 / 5 and 550
+order by gap_size desc
+limit 10
+;
+
+-- List largest gaps ever.
+select
+      slot_no
+    , slot_no - lag(slot_no) over (order by slot_no) as gap_size
+  from
+      block
+order by gap_size desc
+limit 10
+;