Revert "db.default.maxPoolSize=100 を使いきったら終わる"

This reverts commit 5c61db9bd9f37c991a724bd37e8cd9335edc1a5d.
Revert "Revert "db.default.maxPoolSize=100 を使いきったら終わる""

This reverts commit af8f1000221e8a3f6585e2b45bb92a1b57c158bc.