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Using this facility, any utility command can report the target relation upon which it is operating, if there is one, and up to 10 64-bit counters; the intent of this is that users should be able to figure out what a utility command is doing without having to resort to ugly hacks like attaching strace to a backend. As a demonstration, this adds very crude reporting to lazy vacuum; we just report the target relation and nothing else. A forthcoming patch will make VACUUM report a bunch of additional data that will make this much more interesting. But this gets the basic framework in place. Vinayak Pokale, Rahila Syed, Amit Langote, Robert Haas, reviewed by Kyotaro Horiguchi, Jim Nasby, Thom Brown, Masahiko Sawada, Fujii Masao, and Masanori Oyama. |
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