Hi,
Thank you for your interest in this thread. > You could create database on RAM disk and make benchmarks. According to your advice, I created RAM disk and put input files and data directory on RAM disk. But the result changed only a few seconds. In this test case, the table is unlogged table and shared_buffers is enough. So, I think the disk performance does not affect so much. > P.S. Could you point where is the performance measurement script you > mantioned in you email? > I will try to play with it. Thank you. Please use the "test.sh" in the following e-mail. https://www.postgresql.org/message-id/flat/TY3PR01MB11891C0FD066F069B113A2376823E2%40TY3PR01MB11891.jpnprd01.prod.outlook.com#8455c9f7b66780a356511f5cfe029d57 Regards, Ryohei Takahashi
