Question

Perl script to split a large XML file into smaller files

Asked by: liamose

Hi,

I have a large but simple XML file (10gb) that i need to split into a group of smaller files, no larger that 1gb.

Is there a simple perl script that i can use to perform this task ?

A sample of the record contained within the file is attached.

Thanks in advance.

<?xml version = '1.0' encoding = 'UTF-8'?>
<UDM xmlns="http://www.cramer.com/udm" xmlns:udm="http://www.cramer.com/udm" versionNumber="2.0" generatedBy="UDMGenerator" sou
rce="ResourceManager" UDMDateTime="2009-06-01T06:52:51" profileName="export.BulkServiceableLocations.CIS.CIS">
   <location UDMID="25275" name="ServiceLocation_PTVFTTP_1" type="Network Structure" status="1760030082" level="1" UPK="alias2_
PTVFTTP_1">
      <attr UDMID="25475" name="fullName" value=""/>
      <attr UDMID="25476" name="relativeName" value=""/>
      <attr UDMID="25477" name="alias1" value=""/>
      <attr UDMID="25478" name="alias2" value="alias2_PTVFT"/>
      <attr UDMID="25479" name="objectID" value=""/>
      <attr UDMID="25480" name="subType" value=""/>
      <attr UDMID="25481" name="subStatus" value=""/>
      <attr UDMID="25482" name="createdDate" value="2009-05-26 12:44:18.0"/>
      <attr UDMID="25483" name="lastModifiedDate" value="2009-05-26 12:44:19.0"/>
      <attr UDMID="25484" name="address" value=""/>
      <attr UDMID="25485" name="townCity" value=""/>
      <attr UDMID="25486" name="province" value=""/>
      <attr UDMID="25487" name="zip" value=""/>
      <attr UDMID="25488" name="responsible" value=""/>
      <attr UDMID="25489" name="telephone" value=""/>
      <attr UDMID="25490" name="fax" value=""/>
      <attr UDMID="25491" name="address1" value=""/>
      <attr UDMID="25492" name="address2" value=""/>
      <attr UDMID="25493" name="address3" value=""/>
      <attr UDMID="25494" name="functionalStatus" value=""/>
      <attr UDMID="27475" name="UNIT_NUMBER" value=""/>
      <attr UDMID="27575" name="FLOOR" value=""/>
      <attr UDMID="27675" name="PROPERTY_NUMBER" value=""/>
      <attr UDMID="27775" name="STREET_NAME" value="STN_1866"/>
      <attr UDMID="27776" name="STREET_DESCR" value="STYP"/>
      <attr UDMID="27975" name="DISTRIBUTION_AREA" value="DA_205"/>
      <attr UDMID="27976" name="EXCHANGE_AREA" value="EXA_205"/>
      <attr UDMID="27977" name="DATE_SERVICEABLE" value="2015-01-01 00:00:00.0"/>
      <attr UDMID="27978" name="SYSTEM_CODE" value="CBL"/>
      <attr UDMID="28375" name="BUILDINGID" value=""/>
      <attr UDMID="28475" name="ACTION" value=""/>
      <attr UDMID="28476" name="CABLE_LOCATION" value="F"/>
      <attr UDMID="28477" name="LEADIN_LOCATION" value="F"/>
      <attr UDMID="28478" name="HEADEND" value="DVH"/>
      <attr UDMID="28479" name="NODE" value="VPR"/>
      <attr UDMID="28480" name="HUB" value="VPST_130"/>
      <attr UDMID="28481" name="AMPLIFIER" value=""/>
      <attr UDMID="28482" name="POWER" value="IN_1307"/>
      <attr UDMID="28483" name="NODEABBREVIATION" value="NC_1307"/>
      <sourceObject UDMID="25276" SOClass="6" SOObjID="1866"/>
   </location>
</UDM>

                                  
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Asked On
2009-09-24 at 18:52:23ID24760607
Tags

Perl

,

XML

Topics

Perl Programming Language

,

Extensible Markup Language (XML)

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: uaynebPosted on 2009-09-24 at 19:03:31ID: 25419630

And you want to split it so that records do not span over files correct?

 

by: uaynebPosted on 2009-09-24 at 19:03:58ID: 25419632

is this on a unix or linux box?

 

by: liamosePosted on 2009-09-24 at 19:13:14ID: 25419661

Hi uayneb,

Thats correct, i don't want the records to span over files. Each file must be closed off.

This is on a unix (solaris) box.

Thanks

 

by: Adam314Posted on 2009-09-24 at 21:29:40ID: 25420032

This will add the <?xml...> and <UDM...> to the top of each XML file, and a </UDM> at the end, so all of the output is valid XML.  It doesn't do any parsing of the XML, just looks for specific records, and splits there.  So if your XML is not like you posted, that will make it not work.

It opens the file "file1.xml" for input (you can change this on line 12), and outputs "output#.xml", where the # starts at 1 and counts up.  The MaxSize is set to 900MB (base 10). When the output gets that large, it'll split at the next record.  If you know the records are going to be small (about 2.8k in your example), you could make this much closer to 1GB. But if you make it 1GB, it'll split at the next record, making the file slightly larger.

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
 
my $OutputSize = 0;
my $OutputCount = 0;
my $MaxSize = 900_000_000;
 
 
my $out;
open(my $in, '<', 'file1.xml') or die "input: $!\n";
while(<$in>) {
	if(!$out) {
		$OutputCount++;
		$OutputSize = 0;
		open($out, '>', "output$OutputCount.xml") or die "output: $!\n";
		unless($OutputCount==1) {
			print $out qq{<?xml version = '1.0' encoding = 'UTF-8'?>\n};
			print $out qq{<UDM xmlns="http://www.cramer.com/udm" xmlns:udm="http://www.cramer.com/udm" versionNumber="2.0" generatedBy="UDMGenerator" source="ResourceManager" UDMDateTime="2009-06-01T06:52:51" profileName="export.BulkServiceableLocations.CIS.CIS">\n};
		}
	}
	print $out $_;
	$OutputSize += length($_);
	if(m|</location>|i) { #/
		if($OutputSize > $MaxSize) {
			print $out "</UDM>\n";
			close($out);
			$out = undef;
		}
	}
}
close($in);
                                              
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by: liamosePosted on 2009-09-24 at 22:15:40ID: 31633357

Worked perfectly, thank you!

20120131-EE-VQP-002

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