I have a map that contains a PostgreSQL data source. The data source is pointed at an AWS EC2 instance running:
PostgreSQL 10.4 (Ubuntu 10.4-2.pgdg16.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609, 64-bit
I am running Manifold 18.104.22.168 x64 on Windows 10 Pro. In my Manifold bin64 directory I have a libpq.dll file from PostgreSQL 10.5 compiled for Windows x64.
When I run a "passthrough" query (EXECUTE [[ ... ]] ON [My_Data_Source]) it takes ~70 seconds to execute the first time, and only a "blink" each subsequent time. The query returns two rows, containing two columns; a very small amount of data. From the Manifold 9 log, the initial and subsequent query execution times:
2018-10-27 14:05:37 -- Open: C:\Users\joe\Desktop\GT.map (0.032 sec)
2018-10-27 14:05:54 -- Load library: C:\Program Files\manifold-22.214.171.124-x64\bin64\libpq.dll
2018-10-27 14:07:02 -- Query: [qry-Records_by_Project_Per_Form] (67.240 sec)
2018-10-27 14:07:20 -- Query: [qry-Records_by_Project_Per_Form] (0.192 sec)
What could be the cause of that first build-up to executing the query?
Executing the same query text using DBeaver (using a jdbc driver) returns the results in a blink, similar to the non-initial run in Manifold 9.
If before I execute the query I "expand" the PostgreSQL data source, it takes around 9 seconds to enumerate and display the data source contents in the project pane. Executing the query thereafter returns in a "blink". So it seems faster to expand the datasource first, rather than execute the query "cold".
The Manifold 9 directory has been excluded from Windows Defender real-time scanning.
Thanks for any insight here.