TEMP table & IOT table

Question

Hi all,
I have the following observation related to TEMP table. I am wondering if it is always correct.
When you query dba_tables the tablespace_name is empty if it is a temporary table. Also it has 0 records.
Also I just found one index organized table in our db (first time see this creature) based on iot_type = ‘IOT’. It also has tablespace_name column empty and 0 records in table. Based on the knowledge I got from reading the index organized table should just like regular table except that its data is sorted when saved in the database. So if it is being used it should have non zero records in the table, right?
Thanks a lot for your info.
Shirley

Answer 1

Hi..
21:37:05 ravan >conn anand/xxxxxx
Connected.
21:37:46 ravan >21:38:01 ravan >CREATE TABLE t1 (c1 NUMBER PRIMARY KEY, c2 VARCHAR2(30)) ORGANIZATION INDEX tablespace users;
Table created.
Elapsed: 00:00:00.01
21:38:51 ravan >select OWNER,TABLE_NAME,TABLESPACE_NAME,IOT_NAME,IOT_TYPE from dba_tables where table_name='T1';
OWNER                          TABLE_NAME                     TABLESPACE_NAME                IOT_NAME                       IOT_TYPE
ANAND                          T1                                                                                   IOT
21:49:02 ravan >insert into t1 values (1,'a');
1 row created.
Elapsed: 00:00:00.00
21:49:21 ravan >insert into t1 values (2,'b');
1 row created.
Elapsed: 00:00:00.00
21:49:25 ravan >insert into t1 values (3,'c');
1 row created.
Elapsed: 00:00:00.00
21:49:29 ravan >insert into t1 values (4,'d');
1 row created.
Elapsed: 00:00:00.00
21:49:33 ravan >
21:49:34 ravan >commit;
Commit complete.
Elapsed: 00:00:00.00
21:49:36 ravan >
21:49:36 ravan >
21:49:36 ravan >
21:49:37 ravan >select * from t1;
        C1 C2
         1 a
         2 b
         3 c
         4 d
Elapsed: 00:00:00.00
21:50:40 ravan >conn sys/xxxxxx as sysdba
Connected.
21:51:20 ravan >exec dbms_stats.gather_table_stats(ownname =>'ANAND',tabname =>'T1',cascade =>true);
PL/SQL procedure successfully completed.
21:55:34 ravan >select table_name,owner,tablespace_name,num_rows,last_analyzed,avg_row_len,blocks FROM dba_tables WHERE  table_name  like UPPER('%&table_name%');
Enter value for table_name: t1
TABLE_NAME                     OWNER                          TABLESPACE_NAME        NUM_ROWS LAST_ANAL AVG_ROW_LEN     BLOCKS
T1                             ANAND                                                        4 05-MAR-09           5
21:56:50 ravan >select table_owner,table_name,owner AS index_owner,index_name,tablespace_name,num_rows,status,index_type FROM dba_indexes WHERE  table_owner = UPPER('&owner') AND table_name = UPPER('&table_name') ORDER BY table_owner, table_name, index_owner, index_name;
Enter value for owner: anand
Enter value for table_name: t1
TABLE_OWNER          TABLE_NAME                     INDEX_OWNER          INDEX_NAME                  TABLESPACE_NAME        NUM_ROWS STATUS      INDEX_TYPE
ANAND                T1                             ANAND                SYS_IOT_TOP_28811           USERS                            4 VALID    IOT - TOP
Elapsed: 00:00:00.00HTH
Anand