bash when you find two columns delete the first column in bash

That can trivially be done with awk simply with:

awk '{print $NF}' filename

Which will simply print the last field on each line.

Example Use/Output

With your input file in file:

$ awk '{print $NF}' file
hostname-x.y.com:1212/dbname
server.y.com:1012/bname
commom.y.com:9312/xname
windows.y.com:1052/wname

By seeing your sample of expected output(adding more generic solution) if I get it correctly(you want to print data after digits), could you please try following.

awk 'match($0,/[0-9]+:[0-9]+:[0-9]+ +/){print substr($0,RSTART+RLENGTH);next} 1' Input_file

Explanation: Adding detailed explanation for above code.

awk '                                    ##Starting awk program from here.
match($0,/[0-9]+:[0-9]+:[0-9]+ +/){      ##Using match function which matches regex of digits colon digits colon digits then space in line.
  print substr($0,RSTART+RLENGTH)        ##If a match is found then it should print sub-string of line starting from RSTART till RLENGTH.
  next                                   ##next will skip all further statements from here.
}
1                                        ##1 will print edited/non-edited lines here.
'  Input_file                            ##Mentioning Input_file name here.

sed 's/.* //g' < input_file

Demo

:>cat test.txt
0:0:36 hostname-x.y.com:1212/dbname
server.y.com:1012/bname
0:0:9 commom.y.com:9312/xname
windows.y.com:1052/wname
:>sed 's/.* //g' test.txt
hostname-x.y.com:1212/dbname
server.y.com:1012/bname
commom.y.com:9312/xname
windows.y.com:1052/wname
:>

Use cut to take the second filed, with " " as delimiter. If the delimiter is not found, the entire line is given in output, as specified by the -f option help section (cut --help)

-f, --fields=LIST       select only these fields;  also print any line
                            that contains no delimiter character, unless
                            the -s option is specified

The command should be

cut -f2 -d" " yourfile

Demo:

root@a036fb1c94fa:~# cat yourfile
0:0:36 hostname-x.y.com:1212/dbname
server.y.com:1012/bname
0:0:9 commom.y.com:9312/xname
windows.y.com:1052/wname 

root@a036fb1c94fa:~# cut -f2 -d" " yourfile
hostname-x.y.com:1212/dbname
server.y.com:1012/bname
commom.y.com:9312/xname
windows.y.com:1052/wname