真空满后释放内存？
Free memory after Vacuum full?
我的数据库服务器 运行 磁盘 space 即将用完。我从未执行过 vacuum full，我希望 vacuum full 能释放一些 space。
你之前有运行vacuum full吗，如果space被释放了，是多少？
physically vacuum full 复制 table 并销毁旧的。这导致了几个结论：
- 如果您 space 能力不足，您可能无法 运行 它
- 你释放的space与被删除的元组占用的一样多
https://www.postgresql.org/docs/current/static/sql-vacuum.html
This method also requires extra disk space, since it writes a new copy
of the table and doesn't release the old copy until the operation is
complete. Usually this should only be used when a significant amount
of space needs to be reclaimed from within the table.
您可以通过获取数据的恢复副本来无间隙地找出数据的大小，例如pg_dump/pg_restore
我的数据库服务器 运行 磁盘 space 即将用完。我从未执行过 vacuum full，我希望 vacuum full 能释放一些 space。
你之前有运行vacuum full吗，如果space被释放了，是多少？
physically vacuum full 复制 table 并销毁旧的。这导致了几个结论：
- 如果您 space 能力不足，您可能无法 运行 它
- 你释放的space与被删除的元组占用的一样多
https://www.postgresql.org/docs/current/static/sql-vacuum.html
This method also requires extra disk space, since it writes a new copy of the table and doesn't release the old copy until the operation is complete. Usually this should only be used when a significant amount of space needs to be reclaimed from within the table.
您可以通过获取数据的恢复副本来无间隙地找出数据的大小，例如pg_dump/pg_restore