| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Anil Kumar <anil_csir(at)yahoo(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Significance of the magic number of btree pages..? |
| Date: | 2009-02-24 14:00:21 |
| Message-ID: | 49A3FD75.1080303@enterprisedb.com |
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| Lists: | pgsql-hackers |
Anil Kumar wrote:
> Hi to All,
> Iam new to the group and to postgresql. Currently Iam trying to understand how does the planner work by using gdb. During the execution of a plan I observed a variable "BTREE_MAGIC" which is defined 0x053162 and called, 'the magic number of btree pages'. I couldnt understand the concept behind the 'magic number' and the "0x053162". Can anyone kindly explain the significance of the 'magic number of btree pages' or refer to some document where I can get idea about this.
It's just a sanity check and a debugging aid, to let you check that a
b-tree metapage is indeed a b-tree metapage.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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