diff options
Diffstat (limited to 'src/include/pg_config_manual.h')
| -rw-r--r-- | src/include/pg_config_manual.h | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h index 040651fcb17..b36714b87bd 100644 --- a/src/include/pg_config_manual.h +++ b/src/include/pg_config_manual.h @@ -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 1.15 2004/09/10 14:27:37 momjian Exp $ + * $PostgreSQL: pgsql/src/include/pg_config_manual.h,v 1.16 2005/03/29 03:01:32 tgl Exp $ *------------------------------------------------------------------------ */ @@ -52,17 +52,27 @@ #define XLOG_SEG_SIZE (16*1024*1024) /* - * Maximum number of columns in an index and maximum number of - * arguments to a function. They must be the same value. + * Maximum number of arguments to a function. * * The minimum value is 8 (index creation uses 8-argument functions). - * There is no specific upper limit, although large values will waste - * system-table space and processing time. + * The maximum possible value is around 600 (limited by index tuple size in + * pg_proc's index; BLCKSZ larger than 8K would allow more). Values larger + * than needed will waste memory and processing time, but do not directly + * cost disk space. * - * Changing these requires an initdb. + * Changing this does not require an initdb, but it does require a full + * backend recompile (including any user-defined C functions). + */ +#define FUNC_MAX_ARGS 100 + +/* + * Maximum number of columns in an index. There is little point in making + * this anything but a multiple of 32, because the main cost is associated + * with index tuple header size (see access/itup.h). + * + * Changing this requires an initdb. */ #define INDEX_MAX_KEYS 32 -#define FUNC_MAX_ARGS INDEX_MAX_KEYS /* * Define this to make libpgtcl's "pg_result -assign" command process |