# 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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PLAN_TABLE_OUTPUT
| 6 | NESTED LOOPS | | 1 | 221 | 57 (0)| 00:00:01 |
| 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 |
| 11 | NESTED LOOPS | | 1 | 105 | 50 (0)| 00:00:01 |
|* 12 | INDEX RANGE SCAN | year_field | 1 | 29 | 2 (0)| 00:00:01 |
| 13 | SORT AGGREGATE | | 1 | 8 | | |
| 14 | INDEX FULL SCAN (MIN/MAX)| idx_bf_creation_date | 1 | 8 | 2 (0)| 00:00:01 |
|* 15 | TABLE ACCESS BY INDEX ROWID| OHRT_bugs_fact | 1 | 76 | 48 (0)| 00:00:01 |
|* 16 | INDEX RANGE SCAN | idx_bf_creation_date | 76 | | 1 (0)| 00:00:01 |
PLAN_TABLE_OUTPUT
|* 17 | TABLE ACCESS BY INDEX ROWID | OHRT_all_time_dimension | 1 | 34 | 2 (0)| 00:00:01 |
|* 18 | INDEX UNIQUE SCAN | unique_alltime_bug_instance_id | 1 | | 1 (0)| 00:00:01 |
| 19 | TABLE ACCESS BY INDEX ROWID | OHRT_all_time_dimension | 1 | 19 | 1 (0)| 00:00:01 |
|* 20 | INDEX UNIQUE SCAN | unique_alltime_bug_instance_id | 1 | | 1 (0)| 00:00:01 |
|* 21 | INDEX RANGE SCAN | bugseverity_instance_id_ref_id | 1 | 26 | 1 (0)| 00:00:01 |
|* 22 | INDEX UNIQUE SCAN | unique_alltime_bug_instance_id | 1 | 26 | 1 (0)| 00:00:01 |
| 23 | INLIST ITERATOR | | | | | |
|* 24 | TABLE ACCESS BY INDEX ROWID | OHMT_ANL_BUCKET | 1 | 11 | 2 (0)| 00:00:01 |
|* 25 | INDEX UNIQUE SCAN | SYS_C0053213 | 5 | | 1 (0)| 00:00:01 |
|* 26 | INDEX RANGE SCAN | FK_BUCKET_TYPE | 6 | | 0 (0)| 00:00:01 |
|* 27 | TABLE ACCESS BY INDEX ROWID | OHMT_ANL_BUCKET | 1 | 18 | 1 (0)| 00:00:01 |
instance 2
Plan
SELECT STATEMENT ALL_ROWS Cost: 22 Bytes: 142 Cardinality: 1
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
29 NESTED LOOPS
27 NESTED LOOPS Cost: 21 Bytes: 237 Cardinality: 1
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
3 INDEX RANGE SCAN INDEX REPORTSDB.year_field Cost: 2 Bytes: 29 Cardinality: 1
2 SORT AGGREGATE Bytes: 8 Cardinality: 1
1 INDEX FULL SCAN (MIN/MAX) INDEX REPORTSDB.idx_bf_creation_date Cost: 3 Bytes: 8 Cardinality: 1
10 TABLE ACCESS BY INDEX ROWID TABLE REPORTSDB.OHRT_bugs_fact Cost: 13 Bytes: 75 Cardinality: 1
9 BITMAP CONVERSION TO ROWIDS
8 BITMAP AND
5 BITMAP CONVERSION FROM ROWIDS
4 INDEX RANGE SCAN INDEX REPORTSDB.idx_OHRT_bugs_fact_2product Cost: 2 Cardinality: 85
7 BITMAP CONVERSION FROM ROWIDS
6 INDEX RANGE SCAN INDEX REPORTSDB.idx_bf_creation_date Cost: 2 Cardinality: 85
13 TABLE ACCESS BY INDEX ROWID TABLE REPORTSDB.OHRT_all_time_dimension Cost: 2 Bytes: 34 Cardinality: 1
12 INDEX UNIQUE SCAN INDEX (UNIQUE) REPORTSDB.unique_alltime_bug_instance_id Cost: 1 Cardinality: 1
16 TABLE ACCESS BY INDEX ROWID TABLE REPORTSDB.OHRT_all_time_dimension Cost: 1 Bytes: 19 Cardinality: 1
15 INDEX UNIQUE SCAN INDEX (UNIQUE) REPORTSDB.unique_alltime_bug_instance_id Cost: 1 Cardinality: 1
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
24 INLIST ITERATOR
23 TABLE ACCESS BY INDEX ROWID TABLE OPSHUB.OHMT_ANL_BUCKET Cost: 2 Bytes: 11 Cardinality: 1
22 INDEX UNIQUE SCAN INDEX (UNIQUE) OPSHUB.SYS_C0040939 Cost: 1 Cardinality: 5
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
in both explain plan only difference is
9 BITMAP CONVERSION TO ROWIDS
8 BITMAP AND
5 BITMAP CONVERSION FROM ROWIDS
but is bitmap degrading performance lot?
or suggest me what other parameter i can see so 2nd instance gives me better performace.

I see more differences.
In plan 1:
* 16      INDEX RANGE SCAN      idx_bf_creation_date      76           1 (0)     00:00:01
in Plan 2:
1 INDEX FULL SCAN (MIN/MAX) INDEX REPORTSDB.idx_bf_creation_date Cost: 3 Bytes: 8 Cardinality: 1
So this is not about "bitmap" good/bad, it about the access strategy which changed due to differences in data statistics etc. To analyze more, I'd help a LOT if those plans would be formated in a good and same way, use around it to do so.

• Oracle 11g EM error after installation

Hi dears
I installed ORacle 11g on Windows. installation comipleted successfully, but I got an error at the end of the installation that:
"Enterprise Manager configuration failed due to the following error -
Error starting Databae Control
Refer to the log file at c:\..... for more details
You can retry configuring this database with Enterprise Manager later by manually running c:\..... "
What might be reason of this error? I and my friend installed 11gR1 on windows many times, and each time we got this error
any help will be appreciated
thank you

As requested already, post the log file. One thing, you need to ensure that you don't have the DHCP based system but would have a static IP for the machine otherwise you must install a loopback adaptor for the machine before you would configure the EM again. This may not be the error for your EM's failed installation but this is one of the prominent reasons for sure for the failure.
HTH
Aman....

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