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If you backup a folder with wildcard (Ex: dsmc i /tmp/*), then all files will stay active as you don't scan the full directory!!!

Change to

dsmc i /tmp/

Count the number of file version keep during lasts months

> cat count_versions.sh 
#!/bin/bash
file=/tmp/tdpe.txt

dsmadmc -id=admin -pa=xxxxxx -comma -tab "select * from backups where node_name='TDPExchange' order by BACKUP_DATE " >  $file

echo "Month,ACTIVE_versions,INACTIVE_versions,TOTAL_versions"
for i in $(cat $file | cut -d',' -f9 | cut -d'-' -f1,2 | grep '^20' | sort | uniq )
do
  search=",ACTIVE"; linea=$(grep ",$i" $file | grep "$search" | wc -l)
  search=",INACTIVE"; linei=$(grep ",$i" $file | grep "$search" | wc -l)
  linet=$(grep ",$i" $file | wc -l)
  echo "$i,$linea,$linei,$linet"
done

Output, in csv format

Month,ACTIVE_versions,INACTIVE_versions,TOTAL
...
2015-01,12,0,12
2015-02,11,0,11
2015-03,14,2,16
2015-04,151798,4973,156771
2015-05,728365,25234,753599
2015-06,851047,25996,877043
2015-07,931876,26813,958689
2015-08,791743,24138,815881
2015-09,907445,25122,932567
2015-10,269240,8066,277306

In april there was an upgrade Exchange, without patching TDP for Exchange, now it's no more supported on this version, but it also doesn't expire any backup !