Please check with environment variable TMPDIR=/....., because command sort use /tmp and /var/tmp.
Maybe help you.
Thank you for your help.
I have used the '-T' parameter, where i have inserted the following path: /ds_tmp (Where ds_tmp is my tempdir sizing 6Gb).
After, i've broken the input file in two pieces sizing 770 Mb, launched the sort and monitored the tempdir growth...
Naturaly, the sort has successful terminated with a space occupation of 50 % ( 3 Gb on 6 Gb..). This value said.. I must add space on temp dir (sigh!!)... and that sort command haven't good performance.