sqllib下的一些文件哪些能清理

通过查找大文件发现sqllib下前10大文件  想请教一下这些是什么文件，有什么用，哪些是能清理的

sqllib>du - sm * |sort -nr |head

du: -: A file or directory in the path name does not exist.

du: sm: A file or directory in the path name does not exist.

48404816        db2dump

15017776        db2dump/FODC_Trap_2015-11-09-14.32.34.613521_0000

14998936        db2dump/FODC_Trap_2015-11-09-14.32.34.613521_0000/14352476.000.core

12696688        db2dump/FODC_Trap_2015-11-13-09.55.51.699489_0000

12672208        db2dump/FODC_Trap_2015-11-13-09.55.51.699489_0000/9765112.000.core

12571272        db2dump/FODC_Trap_2015-10-10-12.35.17.471529_0000

12549872        db2dump/FODC_Trap_2015-10-10-12.35.17.471529_0000/6947060.000.core

7839336 db2dump/FODC_Trap_2015-10-10-15.27.18.846473_0000

7838616 db2dump/FODC_Trap_2015-10-10-15.27.18.846473_0000/6947062.000.core

633184  acs