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#!/usr/bin/env perl
use strict; use warnings;
...
server02: 2015-06-01T12:41:03-04:00  MYDB101                 7 MB/sec
server02: 2015-06-01T12:41:03-04:00  MYDB202                 7 MB/sec
server02: 2015-06-01T12:41:03-04:00  _OTHER_DB_             55 MB/sec

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Got below result:
./grp.pl 2 3
...
MYDB202 4       20
_OTHER_DB_      4       225

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Frequency Minute:
           collectionTime DB101 DB202 ASM MYDB101 MYDB202 _OTHER_DB_
2015-06-01T12:40:03-04:00   100    14   4       5       6        140  
2015-06-01T12:41:03-04:00     4     8   4      16      14        105

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Frequency Hour:
           collectionTime DB101 DB202 ASM MYDB101 MYDB202 _OTHER_DB_
2015-06-01T12:00:00-04:00     
2015-06-01T13:00:00-04:00