Slow timestamp query after upgrading from Pg13 to Pg16

Hello

After upgrading a Db from Pg13 (Centos) to Pg16(Ubuntu) some queries on a simple, large table (200M rows) are very slowid integer not null
status char(4) not null
status_tstamp timestamp
<... other columns ...>

If I create indexes on

• status, status_tstamp
• status_tstamp when status_timestamp is not null

Queries for a set date range for a given status are good and perform similarly to Pg13

Queries for a set date range are VERY slow compared to Pg13. A few other queries on tables with indexes like

CREATE INDEX table_col ON table (col) WHERE col IS NOT NULL;

also appear to be slow.

Any ideas, observations or comments would be appreciated

Simon

-- 
Simon Windsor

Eml: simon.windsor@cornfield.me.uk
Mob: 0755 197 9733


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