diff options
Diffstat (limited to 'src/include/pg_config_manual.h')
| -rw-r--r-- | src/include/pg_config_manual.h | 43 |
1 files changed, 1 insertions, 42 deletions
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h index 6d7ae4ed575..050f5b876c2 100644 --- a/src/include/pg_config_manual.h +++ b/src/include/pg_config_manual.h @@ -6,52 +6,11 @@ * 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 1.31 2008/04/11 22:54:23 tgl Exp $ + * $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.32 2008/05/02 01:08:27 tgl Exp $ *------------------------------------------------------------------------ */ /* - * Size of a disk block --- this also limits the size of a tuple. You - * can set it bigger if you need bigger tuples (although TOAST should - * reduce the need to have large tuples, since fields can be spread - * across multiple tuples). - * - * BLCKSZ must be a power of 2. The maximum possible value of BLCKSZ - * is currently 2^15 (32768). This is determined by the 15-bit widths - * of the lp_off and lp_len fields in ItemIdData (see - * include/storage/itemid.h). - * - * Changing BLCKSZ requires an initdb. - */ -#define BLCKSZ 8192 - -/* - * RELSEG_SIZE is the maximum number of blocks allowed in one disk - * 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 - * have large file support enabled. By default, we make the limit 1 - * GB to avoid any possible integer-overflow problems within the OS. - * A limit smaller than necessary only means we divide a large - * relation into more chunks than necessary, so it seems best to err - * 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. * XLOG_BLCKSZ must be a power of 2, and if your system supports O_DIRECT I/O, * XLOG_BLCKSZ must be a multiple of the alignment requirement for direct-I/O |