| From: | "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | "Khan, Mahmood Ahram" <Mahmood(dot)Khan(at)in(dot)unisys(dot)com> |
| Cc: | <ishii(at)postgresql(dot)org>, <pgsql-hackers(at)postgresql(dot)org>, <bruce(at)momjian(dot)us> |
| Subject: | Re: pgstattuple module |
| Date: | 2007-10-10 10:27:09 |
| Message-ID: | 470CA8FD.90202@enterprisedb.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Khan, Mahmood Ahram wrote:
> But for some of the functions like btree index metapage,single btree
> pages,bt page items are not clear to me.
Those functions display the contents of b-tree pages. They're really
meant for debugging purposes. You'll need to understand the internal
structure of a b-tree index to make sense of the output. The b-tree
internals are explained in the source tree, in
src/backend/access/nbtree/README, and the source files in the same
directory.
In fact, in 8.3, those functions have been moved to a new, separate
contrib module called pageinspect, along with similar functions for
debugging heap contents. Hopefully that makes the distinction between
functions useful for DBAs and functions useful for developers more clear.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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