I was measuring execution time of one query to my locally hosted Postgresql 9.4. I did it in sequence in Java application (JDBC) and made 100 runs in loop. Whole loop was made in one connection.
Everytime the query took about 10 seconds to execute.
I use default postgresql.conf with one modification:
shared_buffers = 4GB
I got 16GB of RAM, OS is Debian 9.
Why is that query not cached?
Same query executed in sequence, same execution time?
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