08-03-2007
rowid is not an indexed column - it is a "pseudocolumn'. the in () subselect will read thru the entire select statement's result set each time. When I get back in a while I'll write something that is faster. You may need to add an index.
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LEARN ABOUT OPENDARWIN
funindex
funindex(1) SAORD Documentation funindex(1)
NAME
funindex - create an index for a column of a FITS binary table
SYNOPSIS
funindex <switches> <iname> [oname]
OPTIONS
NB: these options are not compatible with Funtools processing. Please
use the defaults instead.
-c # compress output using gzip"
-a # ASCII output, ignore -c (default: FITS table)"
-f # FITS table output (default: FITS table)"
-l # long output, i.e. with key value(s) (default: long)"
-s # short output, i.e. no key value(s) (default: long)"
DESCRIPTION
The funindex script creates an index for the specified column (key) by running funtable -s (sort) and then saving the column value and the
record number for each sorted row. This index will be used automatically
by funtools filtering of that column, provided the index file's modification date is later than that of the data file.
The first required argument is the name of the FITS binary table to index. Please note that text files cannot be indexed at this time. The
second required argument is the column (key) name to index. While multiple keys can be specified in principle, the funtools index process-
ing assume a single key and will not recognize files containing multiple keys.
By default, the output index file name is [root]_[key].idx, where [root] is the root of the input file. Funtools looks for this specific
file name when deciding whether to use an index for faster filtering. Therefore, the optional third argument (output file name) should not
be used for funtools processing.
For example, to create an index on column Y for a given FITS file, use:
funindex foo.fits Y
This will generate an index named foo_y.idx, which will be used by funtools for filters involving the Y column.
SEE ALSO
See funtools(7) for a list of Funtools help pages
version 1.4.2 January 2, 2008 funindex(1)