PCTUsed - PCTFree

Question

Hi,
I am using the below mentioned storage parameters for my tables, due to which oracle isn't able to use the free space after a delete. I can alter the value of PCTUSED but is there a way to remove the PCTUSED parameter from the table defination and let oracle manage it using alter table command so that i dont have to create the table again?
PCTFREE 10
PCTUSED 40
STORAGE(MINEXTENTS 1
MAXEXTENTS 1024
PCTINCREASE 0
BUFFER_POOL DEFAULT
Thanks
Rajat Thakran

Answer 1

exactly ASSM ignores pctfree and pctused while is MSSM it consider which is bydefault 10 and 40 percent respectively.Come what may if you just define pctfree and let the oracle use its own pctused it would be default 40 percent.
SQL> conn sys/sys as sysdba
Connected.
SQL> create tablespace myspace
  2   datafile 'c:\myfile.dbf' size 1G
  3  extent management local uniform size 100M
  4  /
Tablespace created.
SQL> conn scott/tiger
Connected.
SQL> drop table t
  2  /
Table dropped.
SQL> create table t (a number) tablespace myspace
  2  /
Table created.
SQL> conn sys/sys as sysdba
Connected.
SQL> select tablespace_name,status,contents,extent_management,segment_space_management
  2    from user_tablespaces
  3  /
TABLESPACE_NAME                STATUS    CONTENTS  EXTENT_MAN SEGMEN
SYSTEM                         ONLINE    PERMANENT LOCAL      MANUAL
UNDOTBS1                       ONLINE    UNDO      LOCAL      MANUAL
SYSAUX                         ONLINE    PERMANENT LOCAL      AUTO
TEMP                           ONLINE    TEMPORARY LOCAL      MANUAL
USERS                          ONLINE    PERMANENT LOCAL      AUTO
MYSPACE                        ONLINE    PERMANENT LOCAL      MANUAL
6 rows selected.
SQL>  select pct_free,pct_used
  2     from user_tables
  3    where table_name='T'
  4   /
  PCT_FREE   PCT_USED
        10         40
SQL> conn scott/tiger
Connected.
SQL> create table t1 (a number) pctfree 20 tablespace myspace
  2  /
Table created.
SQL> select pct_free,pct_used
  2    from user_tables
  3   where table_name='T1'
  4  /
  PCT_FREE   PCT_USED
        20         40
SQL> how you are identifying that oralce is not reusing that block which cross pctused defined percentage?
Khurram