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o -Support a smaller header for short variable-length fields
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Bruce Momjian
2007-04-07 02:48:16 +00:00
parent b396df8485
commit d6e3bb63cb
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@ -2,7 +2,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (bruce@momjian.us)
Last updated: Wed Apr 4 22:08:46 EDT 2007
Last updated: Fri Apr 6 22:48:08 EDT 2007
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -1436,15 +1436,7 @@ Miscellaneous Performance
* -Merge xmin/xmax/cmin/cmax back into three header fields
* Consider ways of storing rows more compactly on disk
o Support a smaller header for short variable-length fields?
One idea is to create zero-or-one-byte-header versions
of varlena data types. In involves setting the high-bit and
0-127 length in the single-byte header, or clear the high bit
and store the 7-bit ASCII value in the rest of the byte.
The small-header versions have no alignment requirements.
http://archives.postgresql.org/pgsql-hackers/2006-09/msg01372.php
o -Support a smaller header for short variable-length fields
o Reduce the row header size?
o Consider reducing on-disk varlena length from four to two
because a heap row cannot be more than 64k in length