Re: how to improve impdp
Date: Tue, 16 Jul 2013 14:24:25 -0700 (PDT)
Message-ID: <1374009865.43530.YahooMailNeo_at_web121601.mail.ne1.yahoo.com>
I am at a loss to explain why LOB segments remain after the associated table is dropped:
SQL> create table lobtest(
2 lob_seg clob,
3 recid number,
4 descr varchar2(40))
5 lob(lob_seg) store as basicfile (tablespace indx);
Table created.
SQL>
SQL> select * from user_objects;
OBJECT_NAME SUBOBJECT_NAME
OBJECT_ID
-------------------------------------------------------------------------------------------------------------------------------- ----------- ------------------- ------------------------------
DATA_OBJECT_ID OBJECT_TYPE CREATED LAST_DDL_ TIMESTAMP STATUS T G S NAMESPACE EDITION_NAME
------------------------------ ------------------- --------- --------- ------------------- ------- - - - ------------------------------ ---- --------------------------
SYS_IL0000073113C00001$$
73115
73115 INDEX 16-JUL-13 16-JUL-13 2013-07-16:15:21:51 VALID N Y N 4
SYS_LOB0000073113C00001$$
73114
73114 LOB 16-JUL-13 16-JUL-13 2013-07-16:15:21:51 VALID N Y N 8
LOBTEST
73113
73113 TABLE 16-JUL-13 16-JUL-13 2013-07-16:15:21:51 VALID N N N 1
SQL>
SQL> alter table lobtest drop column lob_seg;
Table altered.
SQL>
SQL> select * from user_objects;
OBJECT_NAME SUBOBJECT_NAME
OBJECT_ID
-------------------------------------------------------------------------------------------------------------------------------- ----------- ------------------- ------------------------------
DATA_OBJECT_ID OBJECT_TYPE CREATED LAST_DDL_ TIMESTAMP STATUS T G S NAMESPACE EDITION_NAME
------------------------------ ------------------- --------- --------- ------------------- ------- - - - ------------------------------ ---- --------------------------
LOBTEST
73113
73113 TABLE 16-JUL-13 16-JUL-13 2013-07-16:15:21:52 VALID N N N 1
SQL>
SQL> drop table lobtest purge;
Table dropped.
SQL>
SQL> select * from user_objects;
no rows selected
SQL>
SQL> create table lobtest(
2 lob_seg clob,
3 recid number,
4 descr varchar2(40))
5 lob(lob_seg) store as basicfile (tablespace indx);
Table created.
SQL>
SQL> select * from user_objects;
OBJECT_NAME SUBOBJECT_NAME
OBJECT_ID
-------------------------------------------------------------------------------------------------------------------------------- ----------- ------------------- ------------------------------
DATA_OBJECT_ID OBJECT_TYPE CREATED LAST_DDL_ TIMESTAMP STATUS T G S NAMESPACE EDITION_NAME
------------------------------ ------------------- --------- --------- ------------------- ------- - - - ------------------------------ ---- --------------------------
SYS_LOB0000073116C00001$$
73117
73117 LOB 16-JUL-13 16-JUL-13 2013-07-16:15:21:52 VALID N Y N 8
SYS_IL0000073116C00001$$
73118
73118 INDEX 16-JUL-13 16-JUL-13 2013-07-16:15:21:52 VALID N Y N 4
LOBTEST
73116
73116 TABLE 16-JUL-13 16-JUL-13 2013-07-16:15:21:52 VALID N N N 1
SQL>
SQL> drop table lobtest purge;
Table dropped.
SQL>
SQL> select * from user_objects;
no rows selected
SQL>
No matter how I do it in 11.2.0.3 once I drop the table containing the LOB the LOB segment is dropped.
Which release of Oracle are you using?
David Fitzjarrell
From: "Hsieh, Joan" <Joan.Hsieh_at_tufts.edu> To: "Hsieh, Joan" <Joan.Hsieh_at_tufts.edu>; "Allen, Brandon" <Brandon.Allen_at_OneNeck.com>; "oracle-l_at_freelists.org" <oracle-l_at_freelists.org> Sent: Tuesday, July 16, 2013 2:39 PM
Subject: RE: how to improve impdp
Hi Brandon,
I have managed to drop all the tables and all views, it is much faster than drop user cascade. However, there are a lot of SYS_LOB%$$ LOBSEGMENT left. I couldn't find any drop statement to drop all these LOB objects. Does anyone know how?
Thanks,
joan
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Hsieh, Joan
Sent: Wednesday, July 10, 2013 1:14 PM
To: Allen, Brandon; oracle-l_at_freelists.org
Subject: RE: how to improve impdp
Thanks, Allen.
I'll try it later. My database is 11.2.0.3. Your information is very valuable. ORACLE SR had asked me to generate a trace file for them to review.
Thank you again.
Joan
From: Allen, Brandon [mailto:Brandon.Allen_at_OneNeck.com]
Sent: Wednesday, July 10, 2013 12:48 PM
To: Hsieh, Joan; oracle-l_at_freelists.org
Subject: RE: how to improve impdp
Hi Joan,
Regarding the slowness of your "drop user cascade" statement - you may be encountering bug 6915130 if you're on Oracle 10.2, or maybe a similar bug in different versions. The work around is to drop all the user's objects first (use SQL* to create a script for doing this quickly) and then drop the user.
Regards,
Brandon
*Something like this should work:
set term off
spool drop_tables.sql
set pages 0
set lines 150
set head off
set feed off
select 'drop table ' || owner || '.' || table_name || ' cascade constraints;' from dba_tables where owner = '<USERNAME>' order by table_name; spool off set head on set feed on set pages 1000 set term on
From: "Hsieh, Joan" <Joan.Hsieh_at_tufts.edu<mailto:Joan.Hsieh_at_tufts.edu>>
Subject: RE: how to improve impdp
Date: Tue, 9 Jul 2013 18:31:50 +0000
Hi David,
The database is dataguard environment, so it has to be in archive mode. In cutover time windows, I don't want to break the standby database and have to recreate it later. Our cutover time is combined the AIX database move to LINUX and one peopletools upgrade. So there are two projects going on in the same open window. Peoplesoft tech team it is ok just import data only without the statistics and indexes since both can be taken care in the peoplesoft upgrade. I'm trying to do another test without statistics and indexes.
"Drop user sysadm cascase" on the new LINUX server take almost the whole day to finish. That's another issue.
Joan
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