Reduce default file size limit to 1Gb, and move the

configuration constant to config.h.

1 files changed, 17 insertions, 0 deletions

diff --git a/src/include/config.h.in b/src/include/config.h.in
index 74476b3ef9..49aac61ebb 100644
--- a/src/include/config.h.in
+++ b/src/include/config.h.in
@@ -27,6 +27,23 @@
  */
 #define BLCKSZ	8192
 
+/*
+ * 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.
+ *
+ * CAUTION: RELSEG_SIZE * BLCKSZ must be less than your OS' limit on file size.
+ * This is typically 2Gb or 4Gb in a 32-bit operating system.  By default,
+ * we make the limit one billion bytes 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.
+ *
+ * CAUTION: you had best do an initdb if you change either BLCKSZ or
+ * RELSEG_SIZE.
+ */
+#define RELSEG_SIZE	(1000000000 / BLCKSZ)
+
 /* 
  * The following is set using configure.  
  */