Обсуждение: Analyze on Foreign Data Wrappers - clarification
The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/14/sql-analyze.html Description: Foreign tables are analyzed only when explicitly selected. Nothing wrong just maybe my newness to PG. I don't understand what "selected" means here: 1. When I select the table in a query 2. When I run the analyze command with the FDW table as a parameter 3. Or something else Also, I am not clear if analyze is run on FDW tables when Automvacuum runs; does it run analyze on FDW tables by default. Thanks, Leon
On Monday, October 11, 2021, PG Doc comments form <noreply@postgresql.org> wrote:
Foreign tables are analyzed only when explicitly selected.
2. When I run the analyze command with the FDW table as a parameter
That
Also, I am not clear if analyze is run on FDW tables when Automvacuum runs;
does it run analyze on FDW tables by default.
Based on the prior item I would expect no. It would usually have insufficient data to do otherwise.
I didn’t look hard but aside from this comment about analyze working on foreign tables, if asked, I find no relevant “why” discussion regarding the interaction of analyze and foreign tables in the documentation. Frankly, I’m unsure why it even needs to work at all.
David J.