First of all, thank you all for replying. Jared is right, extent_id 0 is the first extent and it is 64M. And the tablespace is locally-managed and auto-allocate. The size of the table is 9652 MB. And it has 250 extents. extent_id size --------- ----- 0 64 MB 1-113 8 MB 114-249 64 MB
I just do not under stand the way Oracle allocate extents. Specially when the table was created with initial_extent=1700MB. Another question: Is it hurting performance with so many extents? -----Original Message----- Sent: Tuesday, August 26, 2003 9:09 PM To: Multiple recipients of list ORACLE-L Try executing "SELECT EXTENT_MANAGEMENT, ALLOCATION_TYPE FROM DBA_TABLESPACES WHERE TABLESPACE_NAME = '<tablespace-name>'"... You should probably see the responses "LOCAL" and "SYSTEM", indicating that the tablespace is locally-managed and auto-allocate... on 8/26/03 4:44 PM, Roger Xu at [EMAIL PROTECTED] wrote: > > Why the table was created with initial extent as 1700M, > but dba_extents says the first extent is 8M only? > > SQL> select initial_extent from dba_tables where table_name='BSIS'; > 1782579200 > > SQL> select bytes from dba_extents where segment_name='BSIS' and extent_id=1; > 8388608 > > SQL> select bytes,count(*) from dba_extents where segment_name='BSIS' group by > bytes; > 8388608 113 > 67108864 137 > > -----Original Message----- > Sent: Tuesday, August 26, 2003 3:14 PM > To: Multiple recipients of list ORACLE-L > > > Roger, > > 1. Space management can be specified for a tablespace, not a segment. Create > ASSM tablespace and alter table ... move there. > > 2. Locally managed tablespace, I guess. Oracle doesn't need NEXT_EXTENT and > PCT_INCREASE then. > > HTH > Vadim > > -----Original Message----- > Sent: Tuesday, August 26, 2003 3:59 PM > To: Multiple recipients of list ORACLE-L > > > Hi, > > I have the following output when I querying dba_tables. > > Question 1: This table is created using manual management method, right? > What do I do in order to turn it to Automatic segment-space > management? > > Question 2: How come there are no values for NEXT_EXTENT and PCT_INCREASE? > > Thanks, > > Roger Xu > > > PCT_FREE PCT_USED INI_TRANS MAX_TRANS > ---------- ---------- ---------- ---------- > 10 40 1 255 > > INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS PCT_INCREASE > -------------- ----------- ----------- ----------- ------------ > 527491072 1 2147483645 > > FREELISTS FREELIST_GROUPS > ---------- --------------- > 1 1 > > LOGGING BACKED_UP NUM_ROWS > ------- --------- ---------- > YES N 216122635 > > BLOCKS EMPTY_BLOCKS AVG_SPACE CHAIN_CNT > ---------- ------------ ---------- ---------- > 7651115 4307 319 0 > > > AVG_ROW_LEN AVG_SPACE_FREELIST_BLOCKS NUM_FREELIST_BLOCKS > ----------- ------------------------- ------------------- > 254 4496 2 -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Tim Gorman INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). For technical support please email [EMAIL PROTECTED] or you can call (972)721-8257. This email has been scanned for all viruses by the MessageLabs Email Security System. -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Roger Xu INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
