diff options
Diffstat (limited to 'src/include/pg_config.h.in')
| -rw-r--r-- | src/include/pg_config.h.in | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in index caaf626d74..608e75cd7b 100644 --- a/src/include/pg_config.h.in +++ b/src/include/pg_config.h.in @@ -27,6 +27,15 @@ /* The normal alignment of `short', in bytes. */ #undef ALIGNOF_SHORT +/* 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. */ +#undef BLCKSZ + /* Define to the default TCP port number on which the server listens and to which clients will try to connect. This can be overridden at run-time, but it's convenient if your clients have the right default compiled in. @@ -644,6 +653,19 @@ your system. */ #undef PTHREAD_CREATE_JOINABLE +/* 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. 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. A power-of-2 value is recommended to + save a few cycles in md.c, but is not absolutely required. Changing + RELSEG_SIZE requires an initdb. */ +#undef RELSEG_SIZE + /* The size of `off_t', as computed by sizeof. */ #undef SIZEOF_OFF_T @@ -703,9 +725,6 @@ /* Use replacement snprintf() functions. */ #undef USE_REPL_SNPRINTF -/* Define to split data files into 1GB segments. */ -#undef USE_SEGMENTED_FILES - /* Define to build with (Open)SSL support. (--with-openssl) */ #undef USE_SSL |