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Provide a build-time option to store large relations as single files, rather

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than dividing them into 1GB segments as has been our longtime practice.  This
requires working support for large files in the operating system; at least for
the time being, it won't be the default.

Zdenek Kotala
This commit is contained in:
Tom Lane
2008-03-10 20:06:27 +00:00
parent b6912af22b
commit f0828b2fc3
12 changed files with 595 additions and 100 deletions
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14
src/include/pg_config_manual.h
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@@ -6,7 +6,7 @@
* for developers. If you edit any of these, be sure to do a *full*
* rebuild (and an initdb if noted).
*
* $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.28 2008/02/29 20:58:33 alvherre Exp $
* $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.29 2008/03/10 20:06:27 tgl Exp $
*------------------------------------------------------------------------
*/
@@ -27,8 +27,9 @@
/*
* RELSEG_SIZE is the maximum number of blocks allowed in one disk
* file. Thus, the maximum size of a single file is RELSEG_SIZE *
* BLCKSZ; relations bigger than that are divided into multiple files.
* file when USE_SEGMENTED_FILES is defined. Thus, the maximum size
* of a single file is RELSEG_SIZE * BLCKSZ; relations bigger than that
* are divided into multiple files.
*
* RELSEG_SIZE * BLCKSZ must be less than your OS' limit on file size.
* This is often 2 GB or 4GB in a 32-bit operating system, unless you
@@ -39,9 +40,16 @@
* in the direction of a small limit. (Besides, a power-of-2 value
* saves a few cycles in md.c.)
*
* When not using segmented files, RELSEG_SIZE is set to zero so that
* this behavior can be distinguished in pg_control.
*
* Changing RELSEG_SIZE requires an initdb.
*/
#ifdef USE_SEGMENTED_FILES
#define RELSEG_SIZE (0x40000000 / BLCKSZ)
#else
#define RELSEG_SIZE 0
#endif
/*
* Size of a WAL file block. This need have no particular relation to BLCKSZ.