I’m running PostgreSQL 9.3 on Windows 7 and I’m having a performance issue at startup. I have installed PostgreSQL as a service through Windows installer. The database size is 3 Go, with 120 tables. Every time I try to run queries right after Windows startup, it takes a huge amount of time. If I restart the PostgreSQL Windows service, queries are way faster. I have activated debug log and here is what I get before Windows restart: duration: 2.000 ms parse duration: 3.000 ms bind duration: 0.000 ms execute And after Windows restart: duration: 364.000 ms parse duration: 415.000 ms bind duration: 0.000 ms execute For information, the test query is: SELECT t.typlen FROM pg_catalog.pg_type t, pg_catalog.pg_namespace n WHERE t.typnamespace=n.oid AND t.typname='name' AND n.nspname='pg_catalog' It’s not related to the query itself since other queries give the same result (from 10x to 100x longer). Here are my settings (all log and locale-related settings omitted on purpose): bytea_output escape session checkpoint_segments 45 configuration file client_encoding UNICODE session client_min_messages notice session DateStyle ISO, DMY session debug_pretty_print on configuration file debug_print_plan on configuration file default_text_search_config pg_catalog.french configuration file listen_addresses * configuration file logging_collector on configuration file max_connections 100 configuration file max_stack_depth 2MB environment variable port 5432 configuration file shared_buffers 128MB configuration file TimeZone GMT user I run queries through JDBC driver (9.3-1100-jdbc4.jar). I know that the issue is not related to the PC, since it give the same result on a bunch of different computers. I have two questions: * What is the difference between restarting PostgreSQL service and restarting the computer? Is PostgreSQL relying on some kind of OS-level cache outside Windows service? * How can I dig down deeper and see what’s causing PostgreSQL slowdown? Thanks in advance for your help, BR, Guillaume POUSSEL | ♠Sogeti High Tech <mailto:guillaume.pous...@sogeti.com> guillaume.pous...@sogeti.com
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