Large files are created in ORACLE_HOME/dbs

 Oracle 10.2.0.3.0 on Solaris 10. Numbers of large files are created in ORACLE_HOME/dbs. Some files are even more than 1 GB in size. Below is listing for the dbs folder.

bash-3.00$ pwd
/oracle/ora10db/product/10.2.0/Db_1/dbs
bash-3.00$ du -sk
39398052        .
bash-3.00$ ls -l
total 78796098
-rw-r-----   1 oracle   oinstall 98430464 Jul 16 18:03 FINARCHLOG_115_1_692388211
-rw-r-----   1 oracle   oinstall    2560 Jul 16 18:03 FINARCHLOG_116_1_692388211
-rw-r-----   1 oracle   oinstall 41614848 Jul 16 23:34 FINARCHLOG_123_1_692408049
-rw-r-----   1 oracle   oinstall    2560 Jul 16 23:34 FINARCHLOG_124_1_692408049
-rw-r-----   1 oracle   oinstall 50699776 Jul 17 12:12 FINARCHLOG_131_1_692453549
-rw-r-----   1 oracle   oinstall    2560 Jul 17 12:12 FINARCHLOG_132_1_692453549
-rw-r-----   1 oracle   oinstall  180736 Jul 17 12:18 FINARCHLOG_139_1_692453917
-rw-r-----   1 oracle   oinstall    2560 Jul 17 12:18 FINARCHLOG_140_1_692453917
-rw-r-----   1 oracle   oinstall 1454592 Jul 17 12:38 FINARCHLOG_149_1_692455094
-rw-r-----   1 oracle   oinstall    2560 Jul 17 12:38 FINARCHLOG_150_1_692455094
-rw-r-----   1 oracle   oinstall  241664 Jul 17 12:44 FINARCHLOG_157_1_692455464
-rw-r-----   1 oracle   oinstall    2560 Jul 17 12:44 FINARCHLOG_158_1_692455464