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TOAST mop-up work: update comments for tuple-size-related symbols such

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as MaxHeapAttributeNumber.  Increase MaxAttrSize to something more
reasonable (given what it's used for, namely checking char(n) declarations,
I didn't make it the full 1G that it could theoretically be --- 10Mb
seemed a more reasonable number).  Improve calculation of MaxTupleSize.
This commit is contained in:
Tom Lane
2000-08-07 20:16:13 +00:00
parent d2165a4a5d
commit 0224177400
8 changed files with 96 additions and 63 deletions
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17
src/include/storage/bufmgr.h
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@@ -7,36 +7,21 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: bufmgr.h,v 1.39 2000/06/15 03:33:00 momjian Exp $
* $Id: bufmgr.h,v 1.40 2000/08/07 20:15:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef BUFMGR_H
#define BUFMGR_H
#include "storage/buf_internals.h"
/*
* the maximum size of a disk block for any possible installation.
*
* in theory this could be anything, but in practice this is actually
* limited to 2^13 bytes because we have limited ItemIdData.lp_off and
* ItemIdData.lp_len to 13 bits (see itemid.h).
*
* limit is now 2^15. Took four bits from ItemIdData.lp_flags and gave
* two apiece to ItemIdData.lp_len and lp_off. darrenk 01/06/98
*
*/
#define MAXBLCKSZ 32768
typedef void *Block;
/* special pageno for bget */
#define P_NEW InvalidBlockNumber /* grow the file to get a new page */
typedef bits16 BufferLock;
/**********************************************************************