Compressed Table - Drop Unused Column
Feb 9, 2012
what happens if you mark a column unused in a compressed table and then alter table drop unused columns? We had a customer do this and Oracle threw a -3113 (end of communication) error. They did a system restore before contacting us and blew away any evidence in alert logs/trace files. They did this on a 400GB compressed table.
My question is, when you drop an unused column off a compressed table, does it uncompress? Where does this uncompression occur? In the instances default tablespace? In the tablespace configured for the table?
Basically, we are wondering whether the error was due to poor error-handling of the system running out of space during decompression and trying to see if we can reproduce it. This was on an 11.1.0.7 system.
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Nov 14, 2013
SQL> SELECT * FROM DBA_UNUSED_COL_TABS; OWNER TABLE_NAME COUNT ------------------------------ ------------------------------ ---------- CRIS_WAREHOUSE_USER F_TRADING_COLLATERAL_SR 1 SQL> SELECT * FROM DBA_UNUSED_COL_TABS; OWNER TABLE_NAME COUNT ------------------------------ ------------------------------ ---------- CRIS_WAREHOUSE_USER F_TRADING_COLLATERAL_SR 1 SQL> alter table F_TRADING_COLLATERAL_SR drop unused columns; Table altered. SQL> SELECT * FROM DBA_UNUSED_COL_TABS; OWNER TABLE_NAME COUNT ------------------------------ ------------------------------ ---------- CRIS_WAREHOUSE_USER F_TRADING_COLLATERAL_SR 1 SQL>
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Aug 8, 2011
I am getting ORA-39726 error when a dropping a column on a non-compressed table.
SQL> select distinct TABLE_OWNER,COMPRESSION,COMPRESS_FOR from dba_tab_partitions where TABLE_NAME='STM_AE_STMT_HISTORY_DETAIL';
TABLE_OWNER COMPRESSION COMPRESS_FOR
------------------- ---------------------- -------------------
APP_SU DISABLED
SQL> ALTER TABLE APP_SU.STM_AE_STMT_HISTORY_DETAIL DROP COLUMN RATE_DESCR;
ALTER TABLE APP_SU.STM_AE_STMT_HISTORY_DETAIL DROP COLUMN RATE_DESCR
*
ERROR at line 1: ORA-39726: unsupported add/drop column operation on compressed tables
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Jan 11, 2012
my user is trying to drop columns, but she gets below error:
SQL Error: ORA-39726: unsupported add/drop column operation on compressed tables
39726. 00000 - "unsupported add/drop column operation on compressed tables"
i just checked whether table is compressed or not, it is not compressed it seems:
select owner, table_name,COMPRESSION,COMPRESS_FOR from dba_tables
2 where owner = 'EQUIPMENT' AND TABLE_NAME = 'ETHRNT_VRTL_CNXN_HRLY_AGG_SWP';
OWNER TABLE_NAME COMPRESS COMPRESS_FOR
------------------------------ ------------------------------ -------- ------------
EQUIPMENT ETHRNT_VRTL_CNXN_HRLY_AGG_SWP DISABLED
1 row selected. i am able to set one column as UNUSED. and then i am able to see the count accordingly from below view:
select * from DBA_UNUSED_COL_TABS
where owner ='EQUIPMENT' and table_name = 'ETHRNT_VRTL_CNXN_HRLY_AGG_SWP';
but not able to drop the unused columns. if i tried to drop a column directly from the table, that also giving above error.
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Aug 8, 2011
I want to drop a column in a huge table which contain about 420,000,000 rows,i use the alter table drop coumn command to execute,and found it takes a long time and generate huge redo.
Is there any quickly way to drop a column in a huge table?
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Aug 25, 2010
i am tring to drop column but it is taking much time . And there is not locking session also. The table size is 500GB. We have any way to drop to column in fast?
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Sep 7, 2012
I have a table that has 2 columns of type nested table. Now in the purge process, when I try to truncate or drop a partition from this table, I get error that I can't do this (because table has nested tables). how I will be able to truncate/drop partition from this table? IF I change column types from nested table to varray type, will it work?
Also, is there any short method of moving existing data from a nested table column to a varray column (having same fields as nested table)?
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Apr 6, 2010
When drop a table what happen to view,sequence,synonyms,index,constraint for the table
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Jun 14, 2011
When I used to work with foxpro we had used dot matrix printer. At that time if we want, we can print in normal mode, expanded mode and compressed mode. it will be part of your spool file.
Now am printing a text file from forms using text_io package. I would like to know in this how do i print the content in compressed mode using CHR function or some other method.
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Nov 3, 2008
I have read and used the AWR script (mentioned in the page Finding unused index for finding unused customised (Z) indexes in our SAP system using oracle 10.2.0.2 as the SAP database.
But this returns no rows. Is there any precondition? I want to know how much / many times the indexes are used...We are smelling that lot of unused index are there in the database.
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Jul 30, 2010
A way to identify variables declared in a procedure that are not being used? I had thought plsql_warnings might do the trick but it does not.
I have inherited a lot of code that was ill conceived and unfortunately have started to notice a trend.
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May 7, 2013
I made an Index Unused while doing some update by using sql developer right click 'Make unusealbe'. Now I need make it as useable.
marking as Usable. I have checked in all_indexes state is show as 'UNUSABLE'.
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Jul 3, 2013
There two users a and b,and the table b.test_part.And one procedure under a ,text like below:
create or replace procedure a.sp_test
is
vs_sqls varchar2(32767);
begin
vs_sqls:='alter table b.test_part truncate partition p_day';
execute immediate vs_sqls;
end;
now,i have to grant drop any table to a.but in fact,i prefer to drop the special one table "b.test_partany" rather than any other table.how ? no by trigger!
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May 13, 2011
I am trying to Truncate the table but it doesnt get truncated. When I issue the command it even doesnt throw the error. I also tried to drop the table but cant even able to drop the table. I thought table might be locked. But it allows me delete a row from the table.
I am using Oracle 11g Release 11.1.0.7.0
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Jul 15, 2011
I have created a table with space by mistake.how to drop that..?
QL> select * from cat where table_name like 'OM_DW_RTNORD%';
TABLE_NAME TABLE_TYPE
------------------------------ -----------
OM_DW_RTNORD? TABLE
OM_DW_RTNORD TABLE
[code]....
no rows selected
SQL> drop table OM_DW_RTNORD? purge;
drop table OM_DW_RTNORD? purge
*
ERROR at line 1:ORA-00911: invalid character
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Dec 6, 2011
how to drop global temporary table?
while droping global temporary table we are getting below error
"ORA-14452: attempt to create, alter or drop an index on temporary table already in use"
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Nov 26, 2011
,how to drop the queue table from our database.when iam trying to drop the queue table aim getting this error
error dropping AQ$_DEMO_QUEUE_TABLE_G;
ORA-00942:TABLE OR VIEW DOES NOT EXIST
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Feb 24, 2013
How do I perform Undo a drop table operation?
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May 18, 2011
How to drop an index which has a constraint on the table?
while droping the index on the table wheather i should remove the
constraint or disable the constraint or without droping the
constraint
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Jul 8, 2012
I have a table with 80 million records. Is dropping this large table is faster or truncating is faster?
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Jul 23, 2012
I am working on 10.2.0.4 oracle version database of my production,
when executed a simple drop command , the total time it took is 26 secs. on Avg. the table is holding only 20 records. this is happening for the last few weeks , prior to that it took less than 0 secs.
05:22:58 SQL> drop table C$_100GL_INTERFACE ;
Table dropped.
Elapsed: 00:00:26.67
but on successive executions the elapsed time falls to 10-15secs.
And on the same test env, we are achieving the expected results less than 0 secs.
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Oct 20, 2011
How can i check a partition whether it has been compressed? just as flowing test,i can not get the information about partition P_L1 whether been compressed.
SQL> Select
2 aa.compression,
3 aa.partition_name
4 From dba_tab_partitions aa
5 Where aa.table_name = 'TB_HXL_LIST';
COMPRESS PARTITION_NAME
-------- ------------------------------
DISABLED P_L1
DISABLED P_L2
DISABLED P_L3
DISABLED P_L4
SQL> Alter Table tb_hxl_list compress;
Table altered.
SQL> Alter Table TB_HXL_LIST
2 Move Partition P_L1 compress;
Table altered.
SQL> Select
2 aa.compression,
3 aa.partition_name
4 From dba_tab_partitions aa
5 Where aa.table_name = 'TB_HXL_LIST';
COMPRESS PARTITION_NAME
-------- ------------------------------
ENABLED P_L1
ENABLED P_L2
ENABLED P_L3
ENABLED P_L4
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Sep 6, 2013
I am able to duplicate (from active database) 12.1.0.1 database to destination server successfully,however when I add either compressed backupset and/or section size to duplicate commandrecovery at the end of the operation fails due to missing archive log (which is at source server)
******************************************failed duplication****************************************** [oracle@r121 ~]$ rman target sys/sys_pwd@t12 auxiliary sys/sys_pwd@c12Recovery Manager: Release 12.1.0.1.0 - Production on Fri Sep 6 11:30:09 2013 Copyright (c) 1982, 2013, Oracle and/or its affiliates. All rights reserved. connected to target database: T12 (DBID=1222223202)connected to auxiliary database: T12 (not mounted) RMAN> duplicate target database to c12 from active databasesection size 2gspfileparameter_value_convert 't12', 'c12'set db_file_name_convert 't12', 'c12'set log_file_name_convert 't12', 'c12'nofilenamecheck;2> 3> 4> 5> 6> 7>Starting Duplicate Db at 06-SEP-13using target
[code]...
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Nov 18, 2011
I have a problem...
I created a tablespace called my_ts:
CODECREATE TABLESPACE my_ts DATAFILE 'C:\Oracle\oradata\db\my_ts.dbf' SIZE 5M EXTENT MANAGEMENT LOCAL UNIFORM SIZE 128K;
ALTER DATABASE DATAFILE 'C:\Oracle\oradata\db\my_ts.dbf' AUTOEXTEND ON;
Its was sucessfully created and my_ts.dbf file has 5MB
charging with data...
CODEcreate table big_table tablespace my_ts as select * from dba_objects;
select * from big_table;
begin
for i in 1..10 loop
insert into big_table select * from dba_objects;
end loop;
end;
Now the my_ts.dbf file has 90MB
Now I want drop this table:
CODEdrop table big_table purge;
And my tablespace file still has 90MB.
I already tried to restart the database but doesn't works...
how can I reduce the size to the original (5MB)?
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Jan 21, 2003
I have been trying to drop an unused column in a partitioned table, and the number of records stored in this unused column was very high. I kept on running into errors as follows:
ORA-01562: failed to extend rollback segment number 10
ORA-01650: unable to extend rollback segment R09 by 256 in tablespace RBS
I tried to "SET TRANSACTION USE ROLLBACK SEGMENT <name>" with a larger rollback segment, but it still did not work. Can I drop the "unused column" from each partition instead?
How to apply that? Or, what are my options besides increasing the size of the rollback segment?
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Jul 13, 2013
If you mark a column unused, is there any way to project it? I know the docs say you can't, but as the data is still there I would have thought it should be possible. I can see the column in dba_tab_cols, but the obvious ways of making it usable don't work:
orcl> select column_name,hidden_column from user_tab_cols where table_name='DEPT';
COLUMN_NAME HID
------------------------------ ---
LOC NO
DNAME NO
DEPTNO NO
orcl> alter table dept set unused column loc;
Table altered.
orcl> select column_name,hidden_column from user_tab_cols where table_name='DEPT';
COLUMN_NAME HID
------------------------------ ---
SYS_C00003_13071316:19:02$ YES
DNAME NO
DEPTNO NO
orcl> select "SYS_C00003_13071316:19:02$" from dept;
select "SYS_C00003_13071316:19:02$" from dept
*
ERROR at line 1:
ORA-00904: "SYS_C00003_13071316:19:02$": invalid identifier
orcl> alter table dept rename column "SYS_C00003_13071316:19:02$"
2 to loc;
alter table dept rename column "SYS_C00003_13071316:19:02$"
*
ERROR at line 1:ORA-00904: "SYS_C00003_13071316:19:02$": invalid identifier
orcl> alter table dept modify "SYS_C00003_13071316:19:02$"
2 visible;
alter table dept modify "SYS_C00003_13071316:19:02$"
*
ERROR at line 1: ORA-00904: "SYS_C00003_13071316:19:02$": invalid identifier
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Aug 28, 2012
I am in the task of clean up of tables. I need to find the list unused tables and procedures. Is there any way where i can find when was the last time the table queried?
Give sql query to find the list of unused tables and procedures.
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Jul 8, 2011
I have to drop some partitions in table on production environment (to get free space). The environment have to be continuously available. I was considering of use ALTER TABLE ... DROP PARTITION ... UPDATE INDEXES but it is slow, because of use clause UPDATE INDEXES. Is there another possibility to remove these data?
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Jun 10, 2013
I've to create a table every time a procedure is run, initially the table should be dropped and then created every time. From this procedure, the table is neither created nor dropped.
I cant track the error. Why is it so?
CREATE OR REPLACE PROCEDURE TESTPROC IS
S_SQL VARCHAR2(1000);
BEGIN
S_SQL := 'DROP TABLE MYTEST PURGE';
EXECUTE IMMEDIATE S_SQL;
[code]........
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Dec 29, 2011
How i can recover my drop table..i use user managed backup concept after dropping table i cant recover my table..how i use step that my dropped table recover.
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