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Full Discussion: sort takes a long time
Top Forums Shell Programming and Scripting sort takes a long time Post 302494711 by methyl on Tuesday 8th of February 2011 06:31:49 AM
Old 02-08-2011
What Operating System and version are you using?
How many records?
How long does the process take?
Do you have spare memory and disc space which you could give to this sort process.

If your sort has a "-o filename" parameter , use this to specify the output file not a Shell redirect (> filename). It will be much much faster.

If set, what is the value of $TMPDIR ? Can it be set to point to a fast filesystem with at least twice the space of the size of the unsorted file?

You can get a dramatic improvement in the performance of unix sort by tuning the "-y kmem" parameter. It is very important that you start with enough memory allocated to do some serious sorting on the first pass.

Off topic: If you have a database engine it is often quicker to load a large file into a database table with suitable keys, then write the file out in the required order.
 

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SLAPO-VALSORT(5)						File Formats Manual						  SLAPO-VALSORT(5)

NAME
slapo-valsort - Value Sorting overlay to slapd SYNOPSIS
/etc/openldap/slapd.conf DESCRIPTION
The Value Sorting overlay can be used with a backend database to sort the values of specific multi-valued attributes within a subtree. The sorting occurs whenever the attributes are returned in a search response. Sorting can be specified in ascending or descending order, using either numeric or alphanumeric sort methods. Additionally, a "weighted" sort can be specified, which uses a numeric weight prepended to the attribute values. The weighted sort is always performed in ascending order, but may be combined with the other methods for values that all have equal weights. The weight is specified by prepending an integer weight {<weight>} in front of each value of the attribute for which weighted sorting is desired. This weighting factor is stripped off and never returned in search results. CONFIGURATION
These slapd.conf options apply to the Value Sorting overlay. They should appear after the overlay directive. valsort-attr <attribute> <baseDN> (<sort-method> | weighted [<sort-method>]) Configure a sorting method for the specified attribute in the subtree rooted at baseDN. The sort-method may be one of alpha-ascend, alpha-descend, numeric-ascend, or numeric-descend. If the special weighted method is specified, a secondary sort-method may also be specified. It is an error to specify an alphanumeric sort-method for an attribute with Integer or NumericString syntax, and it is an error to specify a numeric sort-method for an attribute with a syntax other than Integer or NumericString. EXAMPLES
database bdb suffix dc=example,dc=com ... overlay valsort valsort-attr member ou=groups,dc=example,dc=com alpha-ascend FILES
/etc/openldap/slapd.conf default slapd configuration file SEE ALSO
slapd.conf(5), slapd-config(5). ACKNOWLEDGEMENTS
This module was written in 2005 by Howard Chu of Symas Corporation. The work was sponsored by Stanford University. OpenLDAP 2.4.28 2011/11/24 SLAPO-VALSORT(5)
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