How many extents allocated when table created?

Question

I am using Oracle 9,
is the number going to be what we specified by minextents?
thanks

Answer 1

Srinivas,
You said,
If its AUTOALLOCATE , Oracle starts with 1 extent of 64KB , then 128KB as the first extent becomes full, then 256KB so on....
Can you help me in understanding this statement?I don't think that its true. See here,
SQL> select * from V$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
SQL> drop tablespace test including contents and tablespaces;
drop tablespace test including contents and tablespaces
ERROR at line 1:
ORA-00905: missing keyword
SQL> drop tablespace test including contents and datafiles;
Tablespace dropped.
SQL> create tablespace test datafile 'd:\test.dbf' size 100m extent
ocal autoallocate ;
Tablespace created.
SQL> select tablespace_name,initial_extent,next_extent from dba_tab
  2  where tablespace_name='TEST'/
  3
SQL> select tablespace_name,initial_extent,next_extent from dba_tab
  2  where tablespace_name='TEST'
  3  /
TABLESPACE_NAME                INITIAL_EXTENT NEXT_EXTENT
TEST                                    65536
SQL> --Creating a table inside in this tablespace
SQL> create table t as select * from dba_objects;
Table created.
SQL> alter table t move tablespace test;
Table altered.
SQL> select tablespace_name, extent_id, bytes/1024, blocks
  2  from user_extents
  3  where segment_name = 'T';
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                    0         64          8
TEST                                    1         64          8
TEST                                    2         64          8
TEST                                    3         64          8
TEST                                    4         64          8
TEST                                    5         64          8
TEST                                    6         64          8
TEST                                    7         64          8
TEST                                    8         64          8
TEST                                    9         64          8
TEST                                   10         64          8
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   11         64          8
TEST                                   12         64          8
TEST                                   13         64          8
TEST                                   14         64          8
TEST                                   15         64          8
TEST                                   16       1024        128
TEST                                   17       1024        128
TEST                                   18       1024        128
TEST                                   19       1024        128
TEST                                   20       1024        128
21 rows selected.
SQL>
SQL> insert into t select * from t;
50356 rows created.
SQL> /
100712 rows created.
SQL> /
201424 rows created.
SQL> /
402848 rows created.
SQL> commit;
Commit complete.
SQL> analyze table t compute statistics;
Table analyzed.
SQL> select tablespace_name, extent_id, bytes/1024, blocks
  2  from user_extents
  3  where segment_name = 'T';
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                    0         64          8
TEST                                    1         64          8
TEST                                    2         64          8
TEST                                    3         64          8
TEST                                    4         64          8
TEST                                    5         64          8
TEST                                    6         64          8
TEST                                    7         64          8
TEST                                    8         64          8
TEST                                    9         64          8
TEST                                   10         64          8
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   11         64          8
TEST                                   12         64          8
TEST                                   13         64          8
TEST                                   14         64          8
TEST                                   15         64          8
TEST                                   16       1024        128
TEST                                   17       1024        128
TEST                                   18       1024        128
TEST                                   19       1024        128
TEST                                   20       1024        128
TEST                                   21       1024        128
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   22       1024        128
TEST                                   23       1024        128
TEST                                   24       1024        128
TEST                                   25       1024        128
TEST                                   26       1024        128
TEST                                   27       1024        128
TEST                                   28       1024        128
TEST                                   29       1024        128
TEST                                   30       1024        128
TEST                                   31       1024        128
TEST                                   32       1024        128
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   33       1024        128
TEST                                   34       1024        128
TEST                                   35       1024        128
TEST                                   36       1024        128
TEST                                   37       1024        128
TEST                                   38       1024        128
TEST                                   39       1024        128
TEST                                   40       1024        128
TEST                                   41       1024        128
TEST                                   42       1024        128
TEST                                   43       1024        128
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   44       1024        128
TEST                                   45       1024        128
TEST                                   46       1024        128
TEST                                   47       1024        128
TEST                                   48       1024        128
TEST                                   49       1024        128
TEST                                   50       1024        128
TEST                                   51       1024        128
TEST                                   52       1024        128
TEST                                   53       1024        128
TEST                                   54       1024        128
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   55       1024        128
TEST                                   56       1024        128
TEST                                   57       1024        128
TEST                                   58       1024        128
TEST                                   59       1024        128
TEST                                   60       1024        128
TEST                                   61       1024        128
TEST                                   62       1024        128
TEST                                   63       1024        128
TEST                                   64       1024        128
TEST                                   65       1024        128
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   66       1024        128
TEST                                   67       1024        128
TEST                                   68       1024        128
TEST                                   69       1024        128
TEST                                   70       1024        128
TEST                                   71       1024        128
TEST                                   72       1024        128
TEST                                   73       1024        128
TEST                                   74       1024        128
TEST                                   75       1024        128
TEST                                   76       1024        128
TABLESPACE_NAME                 EXTENT_ID BYTES/1024     BLOCKS
TEST                                   77       1024        128
TEST                                   78       1024        128
TEST                                   79       8192       1024
TEST                                   80       8192       1024
TEST                                   81       8192       1024
82 rows selected.
SQL>Its not working in the way youmentioned. The extents are of 65kb till 16 extents than it changes to 1024kb untill 78 and then 8192 kb. Is it something that I am missing?
Aman....