Oracle 11g : Sequence Issues after impdp

Hi All,
We are migrating from Oracle 10g to Oracle 11g. As part of this, we take a expdp from 10g and successfully did an import using impdp on to Oracle 11g database.
But the problem is, there were few Primary key violations which occurred and all of them relate to sequences.
The Maximum data in the tables and the last number in the sequences differed which caused the issue.
Upon investigation and browsing the Web, http://www.nerdliness.com/article/2009/03/18/my-oracle-sequencedatapump-shenanigans ; I understood it could be because of the export taken while the application is online and writing to the database.
I reset all the failing sequences manually and it is fine now.
My questions now are
*1) Can we ascertain that the export taken when the source database is offline would eliminate the sequences issue.*
2) As this is being done in Production, I would like to make few checks to ensure that the sequences are properly imported. ---
Again reading few websites and oracle Forums, i found the below sql's..
select table_name, column_name, utl_raw.cast_to_number(high_value) as highval
from dba_Tab_columns
where owner = 'PRODUCTION_OWNER'
AND DATA_TYPE= 'NUMBER'
AND (OWNER, TABLE_NAME, COLUMN_NAME) IN
(SELECT CC.OWNER, CC.TABLE_NAME, CC.COLUMN_NAME
FROM DBA_CONS_COLUMNS CC
JOIN DBA_CONSTRAINTS C
ON CC.OWNER=C.OWNER
AND CC.CONSTRAINT_NAME=C.CONSTRAINT_NAME
WHERE C.CONSTRAINT_TYPE ='P'
ORDER BY 3;
SELECT SEQUENCE_NAME, MIN_VALUE, MAX_VALUE, LAST_NUMBER
FROM DBA_SEQUENCES
WHERE SEQUENCE_OWNER = 'PRODUCTION_OWNER'
ORDER BY LAST_NUMBER
If I relate the last_number with the highval and if they are same, does that mean the sequences are imported properly.
Note: We have sequence caching done and we are on RAC.
Edited by: ramakrishnavydyula on Jan 30, 2013 9:36 AM

We are migrating from Oracle 10g to Oracle 11g. As part of this, we take a expdp from 10g and successfully did an import using impdp on to Oracle 11g database.
But the problem is, there were few Primary key violations which occurred and all of them relate to sequences.
The Maximum data in the tables and the last number in the sequences differed which caused the issue.
it could be because of the export taken while the application is online and writing to the database.I don't know what's your database's size , and what's acceptable downtime for you, but I could never propose such a migration tecnique to any of my customers, due to excessive downtime when databases are quite large.
It's quite obvious that you get such errors when the export is done while people are working, unless you use FLASHBACK_SCN or FLASHBACK_TIME parameter while exporting. But in this case, assuming you don't get errors (e.g. ORA-01555), you'll probably lose a lot ot transactions.
Assuming your 10g database is running in archivelog mode (which should be the default in production DBs) did you think of using RMAN to do the migration ?

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    PL/SQL Release 11.2.0.1.0 - Production
    CORE    11.2.0.1.0      Production
    TNS for Linux: Version 11.2.0.1.0 - Production
    NLSRTL Version 11.2.0.1.0 - Production
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    optimizer_dynamic_sampling           integer     2
    optimizer_features_enable            string      11.2.0.1
    optimizer_index_caching              integer     0
    optimizer_index_cost_adj             integer     100
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    optimizer_use_invisible_indexes      boolean     FALSE
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    optimizer_use_sql_plan_baselines     boolean     TRUEEdited by: P. Forstmann on 1 sept. 2010 20:21

  • Oracle 11g install issues on Windows 7

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    928175 wrote:
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    Edited by: 928175 on Apr 17, 2012 4:25 AMYou should not hijack someone else's thread for your own problems.
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    | 1 | HASH GROUP BY | | 1 | 143 | 59 (2)| 00:00:01 |
    | 2 | VIEW | VM_NWVW_2 | 1 | 143 | 59 (2)| 00:00:01 |
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    | 7 | NESTED LOOPS | | 1 | 210 | 55 (0)| 00:00:01 |
    | 8 | NESTED LOOPS | | 1 | 184 | 54 (0)| 00:00:01 |
    | 9 | NESTED LOOPS | | 1 | 158 | 53 (0)| 00:00:01 |
    | 10 | NESTED LOOPS | | 1 | 139 | 52 (0)| 00:00:01 |
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    32 HASH GROUP BY Cost: 22 Bytes: 142 Cardinality: 1
    31 VIEW VIEW SYS.VM_NWVW_2 Cost: 22 Bytes: 142 Cardinality: 1
    30 HASH UNIQUE Cost: 22 Bytes: 237 Cardinality: 1
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    25 NESTED LOOPS Cost: 20 Bytes: 219 Cardinality: 1
    21 NESTED LOOPS Cost: 18 Bytes: 208 Cardinality: 1
    19 NESTED LOOPS Cost: 17 Bytes: 183 Cardinality: 1
    17 NESTED LOOPS Cost: 16 Bytes: 157 Cardinality: 1
    14 NESTED LOOPS Cost: 15 Bytes: 138 Cardinality: 1
    11 NESTED LOOPS Cost: 13 Bytes: 104 Cardinality: 1
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    18 INDEX UNIQUE SCAN INDEX (UNIQUE) REPORTSDB.unique_alltime_bug_instance_id Cost: 1 Bytes: 26 Cardinality: 1
    20 INDEX RANGE SCAN INDEX REPORTSDB.bugseverity_instance_id_ref_id Cost: 1 Bytes: 25 Cardinality: 1
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    26 INDEX RANGE SCAN INDEX OPSHUB.FK_BUCKET_TYPE Cost: 0 Cardinality: 6
    28 TABLE ACCESS BY INDEX ROWID TABLE OPSHUB.OHMT_ANL_BUCKET Cost: 1 Bytes: 18 Cardinality: 1
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    8 BITMAP AND
    5 BITMAP CONVERSION FROM ROWIDS
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    or suggest me what other parameter i can see so 2nd instance gives me better performace.

    I see more differences.
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    I installed ORacle 11g on Windows. installation comipleted successfully, but I got an error at the end of the installation that:
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