My Experiment of PG crash when dealing with huge amount of data

postgres=# create table test01(id integer, val char(1024)); 

2) insert into the table 2457600 records, which makes totally more than 2400MB:

postgres=# insert into test01 values(generate_series(1,2457600),repeat( chr(int4(random()*26)+65),1024));

It really took a few minutes, When the sql statement run, I can see that the server process is consuming 80% of total memory of the os.

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[root@server ~]# ps aux | grep post

root      3180  0.0  0.0 105296   712 pts/1    S    16:31   0:00 su - postgres

postgres  3181  0.0  0.0  70304   676 pts/1    S+   16:31   0:00 -bash

postgres  3219  0.0  0.2 113644  2864 pts/1    S    16:32   0:00 /usr/local/pgsql/bin/postgres -D /gao/data

postgres  3221  0.4  3.0 113724 35252 ?        Ss   16:32   0:01 postgres: writer process                  

postgres  3222  0.2  0.1 113644  1616 ?        Ds   16:32   0:00 postgres: wal writer process              

postgres  3223  0.0  0.0 114380  1148 ?        Ss   16:32   0:00 postgres: autovacuum launcher process     

postgres  3224  0.0  0.0  73332   472 ?        Ss   16:32   0:00 postgres: stats collector process         

root      3252  0.0  0.0 105296   712 pts/2    S    16:32   0:00 su - postgres

postgres  3253  0.0  0.0  70304   676 pts/2    S    16:32   0:00 -bash

postgres  3285  0.0  0.0  83488   740 pts/2    S+   16:32   0:00 ./psql

postgres  3286 14.8 80.2 2598332 924308 ?      Ds   16:32   0:35 postgres: postgres postgres [local] INSERT

root      3333  0.0  0.0  65424   812 pts/3    S+   16:36   0:00 grep post