The following code is in btreefuncs.c function GetBTPageStatistics:
stat->max_avail = BLCKSZ - (BLCKSZ - phdr->pd_special + SizeOfPageHeaderData);
I think it should be:
stat->max_avail = BLCKSZ - (phdr->pd_special + SizeOfPageHeaderData);
Zdenek
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Zdenek Kotala Sun Microsystems
Prague, Czech Republic http://sun.com/postgresql