Bitmap indexes to track extents in locally managed tablespaces
does any body have any idea that how oracle tracks free and used extents with bitmap indexes in locally managed tablespaces ?
please reply
There are no bitmap indexes, there is a 64k tablespace header block containing the bitmap of occupied and free extents.
Sybrand Bakker
Senior Oracle DBA
Similar Messages
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Explain local manage tablespace and dictionary manage tablespace
hi all,
kindly help me to understand local manage and dictionary manage tablespace
i have read search result and oracle corporation book still unable to understand
what i know that local is managed by bitmap(no redo) and dictionary is managed by dictionary(generates redo) plz explain this as well
and also suggest me some documentation.
thanks
NavinNavin,
These are excerpts from Oracle documentation
Dictionary Managed Tablespace_
If you created your database with an earlier version of Oracle, then you could be using dictionary managed tablespaces. For a tablespace that uses the data dictionary to manage its extents, Oracle updates the appropriate tables in the data dictionary whenever an extent is allocated or freed for reuse. Oracle also stores rollback information about each update of the dictionary tables. Because dictionary tables and rollback segments are part of the database, the space that they occupy is subject to the same space management operations as all other data.
Lcaolly Managed Tablesapce_
A tablespace that manages its own extents maintains a bitmap in each datafile to keep track of the free or used status of blocks in that datafile. Each bit in the bitmap corresponds to a block or a group of blocks. When an extent is allocated or freed for reuse, Oracle changes the bitmap values to show the new status of the blocks. These changes do not generate rollback information because they do not update tables in the data dictionary (except for special cases such as tablespace quota information).
Locally managed tablespaces have the following advantages over dictionary managed tablespaces:
Local management of extents automatically tracks adjacent free space, eliminating the need to coalesce free extents.
Local management of extents avoids recursive space management operations. Such recursive operations can occur in dictionary managed tablespaces if consuming or releasing space in an extent results in another operation that consumes or releases space in a data dictionary table or rollback segment.
The sizes of extents that are managed locally can be determined automatically by the system. Alternatively, all extents can have the same size in a locally managed tablespace and override object storage options.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/physical.htm#sthref518
Regards -
Create table with storage parameters in a locally managed tablespace
Hi,
Can we create object with storage parameters in a locally managed tablespace.
CREATE TABLE my_hash_table_6 (
name VARCHAR2(30),
value VARCHAR2(4000) )
STORAGE (
INITIAL 1M
NEXT 512K
PCTINCREASE 0
MINEXTENTS 2
MAXEXTENTS UNLIMITED )
users default tablespace is locallly managed.
Then this table's extent management will be managed as per the tablespace or as the storage parameters which
were specified at the time of table creation.Why don't you try it yourself ?
TEST@db102 > select * from dba_tablespaces
2 where TABLESPACE_NAME='USERS';
TABLESPACE_NAME BLOCK_SIZE INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS
MAX_EXTENTS PCT_INCREASE MIN_EXTLEN STATUS CONTENTS LOGGING FOR EXTENT_MAN
ALLOCATIO PLU SEGMEN DEF_TAB_ RETENTION BIG
USERS 8192 65536 1
2147483645 65536 ONLINE PERMANENT LOGGING NO LOCAL
SYSTEM NO AUTO DISABLED NOT APPLY NO
TEST@db102 > CREATE TABLE my_hash_table_6 (
2 name VARCHAR2(30),
3 value VARCHAR2(4000) )
4 STORAGE (
5 INITIAL 1M
6 NEXT 512K
7 PCTINCREASE 0
8 MINEXTENTS 2
9* MAXEXTENTS UNLIMITED )
TEST@db102 > /
Table created.
TEST@db102 > select * from user_segments
2 where segment_name='MY_HASH_TABLE_6';
SEGMENT_NAME
PARTITION_NAME SEGMENT_TYPE TABLESPACE_NAME
BYTES BLOCKS EXTENTS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS
MAX_EXTENTS PCT_INCREASE FREELISTS FREELIST_GROUPS BUFFER_
MY_HASH_TABLE_6
TABLE USERS
2097152 256 2 1572864 1
2147483645 DEFAULT
TEST@db102 > -
Default storage for locally managed tablespaces
the documentation says you cannot have a default storage parameter for locally managed tablespaces. Does this mean that we cannot specify
INITIAL
NEXT
PCTINCREASE
MINEXTENTS
MAXEXTENTS for such tablespaces, or is there another way we can, without using default storage?
thanksI amnot sure where you read that part that the default storage clause can't be given.Please see here,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/tspaces.htm#sthref1149
From the doc,
Creating a Locally Managed Tablespace
If the CREATE TABLESPACE statement includes a DEFAULT storage clause, then the database considers the following:
If you specified the MINIMUM EXTENT clause, the database evaluates whether the values of MINIMUM EXTENT, INITIAL, and NEXT are equal and the value of PCTINCREASE is 0. If so, the database creates a locally managed uniform tablespace with extent size = INITIAL. If the MINIMUM EXTENT, INITIAL, and NEXT parameters are not equal, or if PCTINCREASE is not 0, the database ignores any extent storage parameters you may specify and creates a locally managed, autoallocated tablespace.
If you did not specify MINIMUM EXTENT clause, the database evaluates only whether the storage values of INITIAL and NEXT are equal and PCTINCREASE is 0. If so, the tablespace is locally managed and uniform. Otherwise, the tablespace is locally managed and autoallocated.
HTH
Aman.... -
Into the Design Editor, Admin tab: How can I define a tablespace as Locally Managed?
Harvinder,
Locally managed tablespaces are part of the new features of Oracle 8i. the advantages
are when they database objects need to allocate space, they need not go through the
data dictionary, they can find the free space
through bitmaps in the datafile, hence the name locally managed tablespaces.
this improves performance because recursive sql (update/insert/select of data dictionary tables) is avoided.
temporary tablespaces are prime candidates for locally managed tablespaces.
yes the whole database can be created with locally managed tablespaces..but with some restrictions. see oracle documentation for further details.
Mukundan. -
Downsides to Locally Managed Tablespaces?
I am creating a database from scratch and am looking at locally managed tablespaces.
Are there any downsides to locally managed tablespaces?
I understand that if the SYSTEM tablespace is locally managed, then all other tablespaces need to be locally managed. Are there any cons to this?<quote source="AskTom.oracle.com">
Locally managed tablespaces are much faster at allocating and de-allocating
extents - many order of magnitudes faster.
locally managed tablespaces decrease contention on the data dictionary.
There is nothing bad about them, only good things.
</quote>
http://asktom.oracle.com/pls/ask/f?p=4950:8:720407411417074486::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:409670433426 -
Portal, Tablespace defragmentation and Locally Managed tablespaces
We are setting up a Big portal installation. We want to use seperate small, medium and large tablespaces for data, lobs and index as described in the de-fragmention start living white paper. We will also use locally managed tablespaces.
Has anybody set-up a portal installation like this. What where the large and medium data, index and lob segments ?
null<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by David Stoller ():
Anyone try using IFS in a Locally Managed Tablespace? Is it OK?<HR></BLOCKQUOTE>
Yes, we have all tablespaces managed locally. No problems with that. -
Rollback segment in locally manage tablespace
Is it possible to create rollback segment in
locally manage tablespace in oracle 8i(8.1.6)
kuljeet pal singhSrini,
Both the 10gR2 and 11gR2 versions of the database are using automatic undo management.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SQL> show parameter undo
NAME TYPE VALUE
_undo_autotune boolean TRUE
undo_management string AUTO
undo_retention integer 14400
undo_tablespace string UNDOTBS1
SQL>
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> show parameter undo
NAME TYPE VALUE
undo_management string AUTO
undo_retention integer 14400
undo_tablespace string UNDOTBS1
SQL>
Do you know anything about Oracle no longer automatically creating R0 in 11gR2?
Thanks,
Bill -
Locally managed tablespaces in Apps 11.0.3
Hi,
we are on Oracle Apps 11.0.3. we recently upgraded the database to 8i ( 8.1.7.4 ). I would like to change some high activity tablespaces to locally managed tablespaces to improve performance. Are there any issues in doing this ? Can I benefit from this or will I have any issues.
thanks
RamWe moved all the tablespaces to locally managed. Although we convereted the tablespaces to locally managed, occassionally we would see some of the ddl commands hang, cause being system still trying to update fet$ and uet$ tables. We were able to fix this by creating new locally managed tablespaces and move the contents to new locally managed tablespaces.
-
ORA-03264: cannot drop offline datafile of locally managed tablespace
Hi list
A datafile was acidentally created on filesystem in one node of two nodes RAC.
After that the filesystem on which the datafile was created was out of space because of automatic control file backup and sysadmin move this datafile to another device. And before this action RMAN backup stopped work.
Now we replace the datafile to the original location, but it stay offline and recover status, and we cant bring them online because the customer dont have necessary archive logs to recover this datafile. RMAN backup is now working. But now we need to create a DataGuard on a third server and want to drop this datafile.
This datafile dont have any data segment and stay in most critical tablespace of the customer application which have more datafiles. This datafile in question isnt the first datafile of the tablespace.
SQL> select file#, status from v$datafile where name='/oracle/product/db/ars/dbs/arsystem.old';
FILE# STATUS
21 RECOVER
SQL> select file#, status from v$datafile_header where name='/oracle/product/db/ars/dbs/arsystem.old';
FILE# STATUS
21 OFFLINE
How can I drop this datafile?
Thanks
CristianoReview this metalink note, what to do:
How to 'DROP' a Datafile from a Tablespace
Doc ID:111316.1
If you cannot recover the datafile, you have to export the 'rest' of the tablespace (after statement 'alter database datafile '/oracle/product/db/ars/dbs/arsystem.old' offline drop;' was successfully issued). Afterwards drop the tablespace,recreate it and import the data).
Werner -
Unable to create a bitmap index
Hi,
I want to create a bitmap index on one of the colums on a table. I fired following query and it failed.
SQL> CREATE BITMAP INDEX TRANS_N_BITMAPIDX_VEH_PLATFORM ON TRANSACTION_NEW(VEH_PLATFORM) LOCAL;
Error starting at line 2 in command:
CREATE BITMAP INDEX TRANS_N_BITMAPIDX_VEH_PLATFORM ON TRANSACTION_NEW(VEH_PLATFORM) LOCAL
Error at Command Line:2 Column:70
Error report:
SQL Error: ORA-01408: such column list already indexed
01408. 00000 - "such column list already indexed"
*Cause:
*Action:I found there is a combined NORMAL index with VEH_PLATFORM column called ‘IDX$$_30AA00021’. It has following columns
• VEH_PLATFORM
• VEH_MODEL
• MODL_YR_NBR
• VEH_MAKE
• TXN_PROCS_DT
But I was able to create bitmap index on VEH_MODEL,MODL_YR_NBR and VEH_MAKE columns without any error.
Why does it error out for VEH_PLATFORM column?
Regards,
SamHi,
I am sure that BITMAP index is only created for
VEH_MAKE
VEH_MODEL
MODL_YR_NBR
BUILD_REGION
VEH_LINE_SERIES
TRANS_CTG_ID
and not for VEH_PLATFORM.
SQL> SELECT * FROM USER_INDEXES WHERE INDEX_TYPE='BITMAP' AND TABLE_NAME='TRANSACTION_NEW';
INDEX_NAME INDEX_TYPE TABLE_OWNER TABLE_NAME TABLE_TYPE UNIQUENESS COMPRESSION PREFIX_LENGTH TABLESPACE_NAME INI_TRANS MAX_TRANS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS PCT_INCREASE PCT_THRESHOLD INCLUDE_COLUMN FREELISTS FREELIST_GROUPS PCT_FREE LOGGING BLEVEL LEAF_BLOCKS DISTINCT_KEYS AVG_LEAF_BLOCKS_PER_KEY AVG_DATA_BLOCKS_PER_KEY CLUSTERING_FACTOR STATUS NUM_ROWS SAMPLE_SIZE LAST_ANALYZED DEGREE INSTANCES PARTITIONED TEMPORARY GENERATED SECONDARY BUFFER_POOL FLASH_CACHE CELL_FLASH_CACHE USER_STATS DURATION PCT_DIRECT_ACCESS ITYP_OWNER ITYP_NAME PARAMETERS GLOBAL_STATS DOMIDX_STATUS DOMIDX_OPSTATUS FUNCIDX_STATUS JOIN_INDEX IOT_REDUNDANT_PKEY_ELIM DROPPED VISIBILITY DOMIDX_MANAGEMENT SEGMENT_CREATED
TRANS_N_BITMAPIDX_MAKE BITMAP VISUAL TRANSACTION_NEW TABLE NONUNIQUE DISABLED 2 6102 20 305 611 12226 N/A 12226 2208 11-MAY-11 1 1 YES N N N DEFAULT DEFAULT DEFAULT NO YES NO NO NO VISIBLE N/A
TRANS_N_BITMAPIDX_MODEL BITMAP VISUAL TRANSACTION_NEW TABLE NONUNIQUE DISABLED 2 11284 158 71 144 22813 N/A 22813 2321 11-MAY-11 1 1 YES N N N DEFAULT DEFAULT DEFAULT NO YES NO NO NO VISIBLE N/A
TRANS_N_BITMAPIDX_BUILD_REGION BITMAP VISUAL TRANSACTION_NEW TABLE NONUNIQUE DISABLED 2 2911 5 582 1161 5808 N/A 5808 5808 11-MAY-11 1 1 YES N N N DEFAULT DEFAULT DEFAULT NO YES NO NO NO VISIBLE N/A
TRANS_N_BITMAPIDX_MODL_YR_NBR BITMAP VISUAL TRANSACTION_NEW TABLE NONUNIQUE DISABLED 2 2911 5 582 1161 5808 N/A 5808 5808 11-MAY-11 1 1 YES N N N DEFAULT DEFAULT DEFAULT NO YES NO NO NO VISIBLE N/A
TRANS_N_BITMAPIDX_TRANS_CTG_ID BITMAP VISUAL TRANSACTION_NEW TABLE NONUNIQUE DISABLED 2 7547 43 175 359 15457 N/A 15457 2345 11-MAY-11 1 1 YES N N N DEFAULT DEFAULT DEFAULT NO YES NO NO NO VISIBLE N/A
TRANS_N_BITMAPIDX_VEH_LINE_S BITMAP VISUAL TRANSACTION_NEW TABLE NONUNIQUE DISABLED 2 10581 253 41 84 21477 N/A 21477 2247 11-MAY-11 1 1 YES N N N DEFAULT DEFAULT DEFAULT NO YES NO NO NO VISIBLE N/A
6 rows selectedRegards,
Sam -
Partitioned IOT of Object Type - mapping table not allowed for bitmap index
Hi,
looks like a feature available for standard Partitioned IOTs is not supported for object based tables, namely the MAPPING TABLE construct to support secondary local bitmap indexes.
Can you confirm behaviour is as expected/documented?
If so, is a fix/enhancement to support mapping table for object-based Partitioned IOTs in the pipeline?
Results for partition-wise load using pipelined table function are very good, look-ups across tens of millions of rows are excellent.
Environment = Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
OS = Oracle Enterprise Linux Server release 5.2 (Carthage) 2.6.18 92.el5 (32-bit)
Here's the potted test-case...
1) First the non object based Partitioned IOT - data is range-partitioned across the alphabet
CREATE TABLE IOT_Table (
textData VARCHAR2(10),
numberData NUMBER(10,0),
CONSTRAINT IOT_Table_PK PRIMARY KEY(textData))
ORGANIZATION INDEX MAPPING TABLE PCTFREE 0 TABLESPACE Firewire
PARTITION BY RANGE (textData)
(PARTITION Text_Part_A VALUES LESS THAN ('B') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_B VALUES LESS THAN ('C') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_C VALUES LESS THAN ('D') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_D VALUES LESS THAN ('E') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_E VALUES LESS THAN ('F') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_F VALUES LESS THAN ('G') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_G VALUES LESS THAN ('H') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_H VALUES LESS THAN ('I') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_I VALUES LESS THAN ('J') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_J VALUES LESS THAN ('K') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_K VALUES LESS THAN ('L') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_L VALUES LESS THAN ('M') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_M VALUES LESS THAN ('N') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_N VALUES LESS THAN ('O') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_O VALUES LESS THAN ('P') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_P VALUES LESS THAN ('Q') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_Q VALUES LESS THAN ('R') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_R VALUES LESS THAN ('S') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_S VALUES LESS THAN ('T') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_T VALUES LESS THAN ('U') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_U VALUES LESS THAN ('V') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_V VALUES LESS THAN ('W') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_W VALUES LESS THAN ('X') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_X VALUES LESS THAN ('Y') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_Y VALUES LESS THAN ('Z') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_Z VALUES LESS THAN (MAXVALUE) PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0))
NOLOGGING PARALLEL -- FLASHBACK ARCHIVE IOT_Flashback_Data
SQL> table IOT_TABLE created.
2) Create the local secondary bitmap index utilising the underlying mapping table
CREATE BITMAP INDEX IOT_Table_BMI1 ON IOT_Table (numberData)
LOCAL STORAGE (INITIAL 1M PCTINCREASE 0 NEXT 512K) NOLOGGING PARALLEL;
SQL> bitmap index IOT_TABLE_BMI1 created.
3) Quick test to confirm all ok
SQL> INSERT INTO IOT_Table VALUES ('ABC123',100);
SQL> 1 rows inserted.
SQL> SELECT * FROM IOT_Table;
TEXTDATA NUMBERDATA
ABC123 100
4) Now create a minimal object type to use as the template for object table
CREATE TYPE IOT_type AS OBJECT
textData VARCHAR2(10 CHAR),
numberData NUMBER(10,0)
) FINAL
SQL> TYPE IOT_type compiled
5) Attempt to create an object-based range partitioned IOT, including MAPPING TABLE clause as per step (1)
CREATE TABLE IOTObj_Table OF IOT_type (textData PRIMARY KEY)
OBJECT IDENTIFIER IS PRIMARY KEY ORGANIZATION INDEX
MAPPING TABLE -- we'd like to use this feature to enable use of Bitmap Indexes...
PCTFREE 0 TABLESPACE Firewire
PARTITION BY RANGE (textData)
(PARTITION Text_Part_A VALUES LESS THAN ('B') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_B VALUES LESS THAN ('C') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_C VALUES LESS THAN ('D') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_D VALUES LESS THAN ('E') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_E VALUES LESS THAN ('F') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_F VALUES LESS THAN ('G') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_G VALUES LESS THAN ('H') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_H VALUES LESS THAN ('I') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_I VALUES LESS THAN ('J') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_J VALUES LESS THAN ('K') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_K VALUES LESS THAN ('L') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_L VALUES LESS THAN ('M') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_M VALUES LESS THAN ('N') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_N VALUES LESS THAN ('O') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_O VALUES LESS THAN ('P') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_P VALUES LESS THAN ('Q') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_Q VALUES LESS THAN ('R') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_R VALUES LESS THAN ('S') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_S VALUES LESS THAN ('T') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_T VALUES LESS THAN ('U') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_U VALUES LESS THAN ('V') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_V VALUES LESS THAN ('W') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_W VALUES LESS THAN ('X') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_X VALUES LESS THAN ('Y') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_Y VALUES LESS THAN ('Z') PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0),
PARTITION Text_Part_Z VALUES LESS THAN (MAXVALUE) PCTFREE 0 TABLESPACE Firewire Storage (Initial 10M Next 1M PCTIncrease 0))
NOLOGGING PARALLEL -- FLASHBACK ARCHIVE IOT_Flashback_Data
This errors out with the following...
SQL Error: ORA-25182: feature not currently available for index-organized tables
25182. 00000 - "feature not currently available for index-organized tables"
*Cause: An attempt was made to use one or more of the following feature(s) not
currently supported for index-organized tables:
CREATE TABLE with LOB/BFILE/VARRAY columns,
partitioning/PARALLEL/CREATE TABLE AS SELECT options,
ALTER TABLE with ADD/MODIFY column options, CREATE INDEX
*Action: Do not use the disallowed feature(s) in this release.
6) Re-running the create table statement in step 5 without the MAPPING TABLE clause works fine. Not surprisingly an attempt to create a secondary local bitmap index on this table fails as there's no mapping table, like so...
CREATE BITMAP INDEX IOTObj_Table_BMI1 ON IOTObj_Table (numberData)
LOCAL STORAGE (INITIAL 1M PCTINCREASE 0 NEXT 512K) NOLOGGING PARALLEL;
CREATE TABLE with LOB/BFILE/VARRAY columns,
partitioning/PARALLEL/CREATE TABLE AS SELECT options,
ALTER TABLE with ADD/MODIFY column options, CREATE INDEX
*Action: Do not use the disallowed feature(s) in this release.
CREATE BITMAP INDEX IOTObj_Table_BMI1 ON IOTObj_Table (numberData)
LOCAL STORAGE (INITIAL 1M PCTINCREASE 0 NEXT 512K) NOLOGGING PARALLEL
Error at Command Line:99 Column:13
Error report:
SQL Error: ORA-00903: invalid table name
00903. 00000 - "invalid table name"
7) Creating a secondary local b-tree index is fine, like so...
SQL> CREATE INDEX IOTObj_Table_I1 ON IOTObj_Table (numberData)
LOCAL STORAGE (INITIAL 1M PCTINCREASE 0 NEXT 512K) NOLOGGING PARALLEL;
index IOTOBJ_TABLE_I1 created.
8) A quick test to ensure object table ok...
SQL> INSERT INTO IOTObj_Table VALUES (IOT_Type('DEF456',500));
SQL> 1 rows inserted.
SQL> SELECT * FROM IOTObj_Table;
TEXTDATA NUMBERDATA
DEF456 500Thanks Dan,
the intention is to range partition based on the initial character, so A* -> Text_Part_A, B* -> Text_Part_B, and so on.
Here's an example, using an empty IOTObj_Table as created previously.
1) Set up & confirm some test data (two 'D's, one 'N', and two 'Z's)
SQL> INSERT INTO IOTObj_Table VALUES (IOT_Type('DEF456',500));
SQL> INSERT INTO IOTObj_Table VALUES (IOT_Type('DDD111',510));
SQL> INSERT INTO IOTObj_Table VALUES (IOT_Type('N3000',515));
SQL> INSERT INTO IOTObj_Table VALUES (IOT_Type('ZZ1212',520));
SQL> INSERT INTO IOTObj_Table VALUES (IOT_Type('Z111X',530));
SQL> COMMIT;
SQL> SELECT * FROM IOTObj_Table;
TEXTDATA NUMBERDATA
DDD111 510
DEF456 500
N3000 515
Z111X 530
ZZ1212 520
2) Just to prove our IOT is enforcing the Primary Key based on the TextData attribute, try to insert a duplicate
SQL> INSERT INTO IOTObj_Table VALUES (IOT_Type('Z111X',530));
Error starting at line 141 in command:
INSERT INTO IOTObj_Table VALUES (IOT_Type('Z111X',530))
Error report:
SQL Error: ORA-00001: unique constraint (OCDataSystems.SYS_IOT_TOP_84235) violated
00001. 00000 - "unique constraint (%s.%s) violated"
*Cause: An UPDATE or INSERT statement attempted to insert a duplicate key.
For Trusted Oracle configured in DBMS MAC mode, you may see
this message if a duplicate entry exists at a different level.
*Action: Either remove the unique restriction or do not insert the key.
3) Now confirm that our data has been slotted into the range-based partition we expect using the PARTITION clause of SELECT...
- The two 'D's...
SQL> SELECT * FROM IOTObj_Table PARTITION (Text_Part_D);
TEXTDATA NUMBERDATA
DDD111 510
DEF456 500
- The single 'N'...
SQL> SELECT * FROM IOTObj_Table PARTITION (Text_Part_N);
TEXTDATA NUMBERDATA
N3000 515
- The two 'Z's...
SQL> SELECT * FROM IOTObj_Table PARTITION (Text_Part_Z);
TEXTDATA NUMBERDATA
Z111X 530
ZZ1212 520
4) And to wrap up confirm an empty partition
SELECT * FROM IOTObj_Table PARTITION (Text_Part_W); -
Convert from dictionary to local managed?
Hi all,
Good day!
when we convert from dictionary to local managed is it dependant on CPU or no of extent?
Thanks in advance
ElinaHow are you converting the tablespaces? 8 hours seems excessive if you are using dbms_space_admin.TABLESPACE_MIGRATE_TO_LOCAL , I have seen situations where creating new locally managed tablespaces and moving the objects accross takes a long time as the old extnets are deallocated from the UET$ table and added to FET$. in these cases the speed of an individual CPU core is the limiting factor as SMON handles the deallocation of extents.
If this is the case then migratig the tablespace to locally managed using dbms_space_admin then migrating to a new tablespace may be faster, if not then can you post what method you are uing to migrate and the version of the database
Chris -
Storage clause for locally manged tablespace with unifom size extents
in oracle 9i PERSONAL EDITION
I HAVE CREATED A TABLESPACE TEST1 AS LOCALLY MANAGED WITH UNIFORM SIZE AS 256K.MY DB_BLOCK_SIZE IS 4K
I HAVE CREATED A TABLE XYX IN THE TEST1 TABLESPACE WITH THE STORAGE (INITIAL 52K NEXT 52K)
WHEN I QUERIED THE DBA_EXTENTS IT SHOWS THE INITAIL EXTENT AS 256 K
BUT WHEN I QUERIED THE DBA_SEGMENTS IT SHOWS THE INITAL_EXTENT AS 52K.
IS THEIR ANY SIGNIFICANCE OF SPECIFYING THE STORAGE CLAUSE IN LOCALLY MANAGED TABLESPACES.take a example what is effect of set storage parameter in table whoes tablespace is locally manager and have uniform size
i have a tablespace whoes
[b]uniform size is 32k
but when i create a table then i set initial 128k
now when table is create it create 4 extent
of 32 each(32*4=128)
because tablespace uniform size is 32
if we give intial 256 then it create
8 extent(32*8=256)
like
create tablespace tt_check
datafile 'E:\ORACLE\SAFE_DATA\tt_check.dbf' size 10m
extent management local uniform size 32k;
create table tt_1
(no number)
tablespace tt_check
storage(initial 128k
next 128k);
1* select extent_id,segment_name,tablespace_name,bytes from dba_extents where segment_name='TT_1'
QL> /
EXTENT_ID SEGMENT_NAME TABLESPACE_NAME BYTES
0 TT_1 TT_CHECK 32768
1 TT_1 TT_CHECK 32768
2 TT_1 TT_CHECK 32768
3 TT_1 TT_CHECK 32768
hope it will help you
kuljeet pal singh -
Convert a tablespace to local managed
Is it possible to have a local managed tablespace and convert it to dictionary managed?
Really I have not seen that posibility directly with a command but you could check the ALTER TABLESPACE command but remember that you could do this:
1.- Create a tablespace dictionary managed if the system tablespace is not locally managed
2.- Move all tables and indexes to that tablespace found in the another tablespace.
Joel Pérez
http://otn.oracle.com/experts
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