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Accordingly, there really isn't that much of a performance gain going from 32 to 64 bits with PostgreSQL on Windows the main tunable that would normally benefit from having more RAM available doesn't actually utilize it very well. You'll do better to leave the rest for the operating system cache rather than dedicate it to the database. The point of diminishing return generally ends up being <=512MB of dedicated memory for the database whether you have a 32-bit or 64-bit build of PostgreSQL. However, if you are on Windows, PostgreSQL doesn't handle shared memory as efficiently as on UNIX-ish platforms.
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The point of diminishing returns on that tunable (shared_buffers) is usually around 8GB, but it will be limited to <2GB on a 32-bit system. Second, it's possible to allocate more memory for the database's dedicated buffer cache. First, data types that can fit into 64-bits (larger integers and timestamp types mainly) can be more efficiently passed around directly in registers rather than using pointers.
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For example, if validate_password.changed_characters_percentage has a value of 50, at least half of the characters in the replacement account password must not be present in the current password, or the password is rejected.PostgreSQL benefits from having a 64-bit build in two main ways. This new verification setting is a percentage of the total characters in the current password.