Oracle Server's harddisk out of space. DBCompress in Oracle 9i

Question

My oracle server's PC is running out a harddisk space because of volume of data. I deleted huge data in order to lessen the occupied space but still out and it doubled the occupied.
e.g.
DELETE FROM TABLE1 WHERE TBLNO > 100000
I am thinking of log files or the deleted data are still on the database but i dont know where.
Please teach me on how to database compress or other way to lessen the data size.
Thank you very much.
Eros
Japan

Answer 1

The following statements are the result of execution. Please teach me the meaning.
Actually your and my idea are the same but I don't know the implementation or on how to handle. I am using MSSQL before, Oracle is a little bit different.
Thanks.
SQL*Plus: Release 9.2.0.1.0 - Production on 水 Oct 24 20:21:02 2007
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Personal Oracle9i Release 9.2.0.1.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.1.0 - Production
に接続されました。
SQL> select name, log_mode from v$database;
NAME LOG_MODE
VBM NOARCHIVELOG
SQL> archive log list;
ORA-01031: 権限が不足しています。
SQL> show paramater LOG_ARCHIVE
SP2-0158: 不明なSHOWオプションです。"paramater"
SP2-0735: 不明なSHOWオプション("LOG_ARCHIV..."で開始)です。
SQL>