Space utilization of Oracle XDB

Question

hi,
There is a significant difference in the size of .dbf files for USERS tablespace & size of individual tables.
Total size of .dbf files is 30 GB approx.
Total Table size = 2853 MB
1. Is there a way to find how has Oracle allocated the remaining space (30GB - 2.8 GB) ?
2. Also if there's any free space or ways to utilize this space ?
After file system reaches 100%, oracle no longer inserts data. So I feel that files are not empty. Also I could not resize them.
My Db has just 2 tables.
Tables:
EVENT = 658780 rows = 5 MB
ENTITY = 60930 rows = 352 MB
PATH_TABLE = 2496 MB ( This table is created by XMLINDEX )
USERS tablespace files:
EVTXQ1_Users_02.dbf - 17 GB
EVTXQ1_Users_01.dbf - 3.5 GB
EVTXQ1_Users_03.dbf - 9.8 GB
Note: Query used to find db size:
select sum(BYTES/1024/1024) as TOTAL_MB from user_segments where SEGMENT_NAME = 'ENTITY';
CREATE TABLE ENTITY OF XMLType XMLTYPE store AS SECUREFILE BINARY XML;
create Index ENTITY_IX on ENTITY(object_value) indextype is XDB.XMLIndex;
CREATE TABLE EVENT
(     "EUID" VARCHAR2(4000 BYTE) NOT NULL ENABLE,
     "SERIALNUM" NUMBER(*,0) NOT NULL ENABLE,
     "EVENTS" CLOB,
     CONSTRAINT "QUOTE_BOOK_EVENT_PK" PRIMARY KEY ("EUID", "SERIALNUM")
Thanks in advance.

Answer 1

A cool script (and a better one than mine) is the following from Tanel Poder (see Google for his blogsite):
SQL> @tanel_df
TABLESPACE_NAME                  TotalMB    UsedMB    FreeMB % Used Ext Used
EXAMPLE                              100        79        21    79% YES |################    |
FLOW_1                                 5         3         2    60% NO  |############        |
MEDIAWIKI_STAGE                    21438     15247      6191    72% YES |###############     |
MEDIAWIKI_STAGE_INDEX               1193        10      1183     1% YES |#                   |
SYSAUX                              1018       955        63    94% YES |################### |
SYSTEM                               760       752         8    99% YES |####################|
TEMP                                  54        54         0   100% YES |####################|
UNDOTBS1                            1225        14      1211     2% YES |#                   |
USERS                                  6         5         1    84% YES |#################   |
9 rows selected.
SQL> l
  1  select t.tablespace_name, t.mb "TotalMB", t.mb - nvl(f.mb,0) "UsedMB", nvl(f.mb,0) "FreeMB",
  2         lpad(ceil((1-nvl(f.mb,0)/t.mb)*100)||'%', 6) "% Used", t.ext "Ext",
  3         '|'||rpad(lpad('#',ceil((1-nvl(f.mb,0)/t.mb)*20),'#'),20,' ')||'|' "Used"
  4  from (
  5    select tablespace_name, trunc(sum(bytes)/1048576) MB
  6    from dba_free_space
  7    group by tablespace_name
  8   union all
  9    select tablespace_name, trunc(sum(bytes_free)/1048576) MB
10    from v$temp_space_header
11    group by tablespace_name
12  ) f, (
13    select tablespace_name, trunc(sum(bytes)/1048576) MB, max(autoextensible) ext
14    from dba_data_files
15    group by tablespace_name
16   union all
17    select tablespace_name, trunc(sum(bytes)/1048576) MB, max(autoextensible) ext
18    from dba_temp_files
19    group by tablespace_name
20  ) t
21  where t.tablespace_name = f.tablespace_name (+)
22* order by t.tablespace_nameIt is not easy to resize (shrink) a tablespace beyond its highwater mark. Search Google for answers (and/or post the question on the "general database" OTN forum).
In normal cases a default created tablespace, is a locally managed one that extends on space location needs. You can find out what the current settings are via dbms_metadata (same method applies to tables etc)
SQL> set long 10000000
SQL> select dbms_metadata.get_ddl('TABLESPACE','MEDIAWIKI_STAGE') from dual;
DBMS_METADATA.GET_DDL('TABLESPACE','MEDIAWIKI_STAGE')
  CREATE BIGFILE TABLESPACE "MEDIAWIKI_STAGE" DATAFILE
  '/u02/oracle/oradata/BETA1/mediawiki_stage.dbf' SIZE 262144000
  AUTOEXTEND ON NEXT 262144000 MAXSIZE 51200M
  LOGGING ONLINE PERMANENT BLOCKSIZE 8192
  EXTENT MANAGEMENT LOCAL AUTOALLOCATE DEFAULT NOCOMPRESS  SEGMENT SPACE MANAGEMENT AUTO
   ALTER DATABASE DATAFILE
  '/u02/oracle/oradata/BETA1/mediawiki_stage.dbf' RESIZE 22480355328
1 row selected.
SQL> select * from tab;
TNAME                          TABTYPE CLUSTERID
BASICFILE_XMLSCHEMA            TABLE
IDX_CONTENT_TABLE              TABLE
OOPS                           TABLE
TEST_DATA                      TABLE
WIKI_STAGE                     TABLE
WIKI_STAGE_ERRORS              TABLE
6 rows selected.
SQL> select dbms_metadata.get_ddl('TABLE','BASICFILE_XMLSCHEMA', user) from dual;
DBMS_METADATA.GET_DDL('TABLE','BASICFILE_XMLSCHEMA')
  CREATE TABLE "WIKI"."BASICFILE_XMLSCHEMA" OF "SYS"."XMLTYPE"
  XMLTYPE STORE AS BASICFILE BINARY XML  (
  TABLESPACE "MEDIAWIKI_STAGE" ENABLE STORAGE IN ROW CHUNK 8192 RETENTION
  NOCACHE LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS
1 BUFFER_POOL DEFAULT))
XMLSCHEMA "http://www.mediawiki.org/xml/export-0.3/" ELEMENT "page" ID 4360 DISALLOW NONSCHEMA
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  TABLESPACE "MEDIAWIKI_STAGE"
1 row selected.