The second and terminal release of Oracle Corporations Oracle 11g database product. 11.2 was released for Linux on September 1st, 2009. New features added include RAC One Node, Improved data compression ratios (up to 20x), Edition Based Redefinition, Recursive Subquery Factoring, Instance Caging, ...

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2
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2answers
5k views

Why can't we specify group functions in Oracle in the where clause?

SQL> desc tab1 Name Null? Type ----------------------------------------- -------- ---------------------------- ID ...
8
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2answers
726 views

LNNVL Justification

LNNVL is an oracle built in function that returns TRUE for conditions evaluating to FALSE or UNKNOWN, and returns FALSE for conditions evaluating to TRUE. My question is what would be the benefit of ...
5
votes
1answer
1k views

DROP PARTITION strategy using LIST-REF composite partitioning

We have a large Oracle 11gR2 instance with some tables that have recently become an annoyance when deleting data. This database powers a large optimization cluster that takes input metadata from the ...
3
votes
1answer
1k views

Unable to create a tablespace, unusual error

I'm having difficulty creating tablespaces with Oracle 11gR2 on a fiber attached disk array. Permissions are correct and there is ample space available. I can create tablespaces on other mounts that ...
2
votes
1answer
510 views

Recover Oracle database after drive loss Interview Question

How would you answer this as an interview question? The database crashed and you lost a drive containing one of your control files and another drive containing an entire redo log group. You ...
5
votes
1answer
2k views

DBMS_Resource_Manager.Calibrate_IO Usage

DBMS_Resource_Manager has a procedure called Calibrate_IO with a Physical Disks input parameter. The documentation says this value should be set to the... Approximate number of physical disks in ...
3
votes
2answers
338 views

How to create a user with a particular user_id?

Is it possible to specify the user_id of a user while creating it? SQL> create user user1 identified by user1; User created. SQL> select user_id, username from all_users where ...
3
votes
1answer
748 views

Oracle query against SQL Server database giving inconsistent results

We have multiple Oracle 11.2.0.2 databases with og4odbc database links to a SQL Server 2008 database. A particular table in the SQL Server database has two Varchar(36) columns. The following ...
1
vote
1answer
210 views

Why am I not seeing any benefits of parallel execution when parallel clause is used?

I have these two methods of creating a table and populating with rows. The first one uses a parallel (degree 3) clause, so I expected the inserts to be much faster. But I timed the time taken for a) ...
2
votes
2answers
3k views

What does 'nls' in nls_date_format stand for?

For example: alter session set nls_date_format = 'DD-MON-YYYY hh24:mi:ss'; changes the date format for the session. What is nls here?
9
votes
3answers
6k views

How to differentiate between SQL and PL/SQL?

I know the question might sound too stupid, but I never understood this part. SQL*Plus works with both SQL and PL/SQL. How do I know whether some code is SQL or PL/SQL? If my code has a for ...
1
vote
1answer
11k views

Where all can the /*+ PARALLEL */ hint be used?

It works with SELECT and UPDATE statements. Are there some more statements with which it works? I was able to use it with create, but am not sure if the hint was actually considered. SQL> create ...
2
votes
2answers
3k views

In Oracle, how to globally enable parallel execution?

In Oracle 11g, is there a way to tell the database to use parallel execution whenever possible by setting a flag etc, rather than using PARALLEL hints with every SQL statement?
3
votes
2answers
3k views
22
votes
4answers
9k views

Why is OS authentication considered poor security for Oracle databases?

Oracle is deprecating OS authentication according to the Oracle Database Security Guide, which says Be aware that the REMOTE_OS_AUTHENT parameter was deprecated in Oracle Database 11g Release ...
4
votes
3answers
1k views

Detect Index Coalesce

Is there a way to know if a COALESCE has been done on an index? Doing one doesn't seem to update the CREATED, LAST_DDL_TIME, or LAST_ANALYZED attributes. Note: I am not referring to the COALESCE ...
5
votes
1answer
627 views

Case Behavior Changed Between 11.2.0.1 and 11.2.0.2

I have a case open with Oracle and they say they can't reproduce this. Running the following in 11.2.0.1 or lower produces two rows from both of these queries, but in 11.2.0.2 the second query ...
4
votes
2answers
963 views

Identify which parameters were passed to a procedure (Oracle)

Procedures in PL/SQL can have default values for parameters, but the caller can pass values that are identical to the default values. Is there a way from within the PL/SQL to determine whether a ...
5
votes
3answers
990 views

How can a datapump export have its resource usage limited on windows?

Doing an export of a number of users causes high CPU and I/O usage. I can mitigate the effects of the CPU usage using Resource Manager and setting the export session to a low priority group, but how ...
8
votes
1answer
478 views

How can a datapump export have its resource usage limited on linux?

Doing an export of a number of users causes high CPU and I/O usage. I can mitigate the effects of the CPU usage using Resource Manager and setting the export session to a low priority group, but how ...
10
votes
2answers
2k views

Security for Application Developers doing PL/SQL work in Oracle

How do you handle the lack of Schema level privileges in Oracle? Oracle’s security architecture works well for applications that only need object level privileges and it works well for DBAs that need ...
3
votes
1answer
452 views

Is there a way to allow a proxy connection to use passed authentication in a public database link?

I think the answer to this is no, but I could be wrong. If nothing else it might be nice for others to be aware of this limitation of proxy connections.
1
vote
1answer
875 views

Can a Wallet be used with SQL Developer? How?

I have a Wallet configured and working fine for SQLPlus. Is there a way to make it work with SQL Developer?