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Questions tagged [oracle-11g-r2]

Oracle Database 11g Release 2. Please also tag oracle for search purposes.

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44
votes
14answers
154k views

Eliminate duplicates in ListAgg (Oracle)

Prior to Oracle 11.2 I was using a custom aggregate function to concatenate a column into a row. 11.2 Added the LISTAGG function, so I am trying to use that instead. My problem is that I need to ...
39
votes
4answers
73k views

What is the difference between sys and system accounts in Oracle databases?

There are two ways to connect to Oracle as a administrator using sqlplus: sqlplus sys as sysdba sqlplus system/manager These accounts should be uses for different purposes, I suppose. Which tasks ...
32
votes
9answers
34k views

How do you version your Oracle database changes?

I am interested to know what methods other people are using to keep track of changes made to the database including table definition changes, new objects, packages changes, etc. Do you use flat files ...
29
votes
4answers
16k 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 1 ...
22
votes
6answers
442k views

How to determine if an Oracle table is locked or not?

We've been using BI software and a repository database that are installed on Oracle Enterprise 11gR2. Some of these batch reports will try to access a database table which may still be locked. How ...
16
votes
3answers
14k 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 ...
16
votes
4answers
12k views

What is the significance of a semicolon at the end of SQL*Plus commands?

Some statements like create table, insert into etc take a semicolon at the end: CREATE TABLE employees_demo ( employee_id NUMBER(6) , first_name VARCHAR2(20) , last_name ...
16
votes
3answers
2k views

Oracle is not using a unique index for a long key

I have a table with 250K rows in my test database. (There are a few hundred millions in production, we can observe the same issue there.) The table has an nvarchar2(50) string identifier, not null, ...
15
votes
2answers
95k views

“ORA-01950: no privileges on tablespace 'SYSTEM' ” : What error is it?

Earlier I created a user : SQL>create user suhail identified by password SQL>User created. SQL>Grant create session,create table to suhail; SQL>Grant Succeeded. but when I login as ...
15
votes
4answers
62k views

Execute a script with SQLPlus containing blanks, semi-colons, and forward slashes

Occasionally I will get a script that will run fine in SQL Developer or Toad, but requires modification in order to be run successfully from SQL*Plus. Here is a worst case example containing multiple ...
14
votes
2answers
76k views

How to free up disk space? which logs/directories to clean?

I want to free up the disk space on my Linux machine. I've drill down the space usage and found that the following directories have a big size /u01/app/11.2.0/grid/cv/log /u01/app/11.2.0/grid/log/...
13
votes
2answers
61k views

Importing schema to new or different tablespace

Is there a convenient way to import a schema into Oracle 11gR2 using a single new or different tablespace than where the data originated? As an example, I have exported BLOG_DATA from OLDDB, where ...
13
votes
2answers
4k 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 ...
12
votes
2answers
2k 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 ...
12
votes
1answer
4k views

Commit vs Fast Commit vs Commit Cleanout in Oracle Database

I was wondering whether someone could verify my understanding regarding the differences between those 3 terms as pertaining to Oracle Databases. Many sources confuse these terms and do not explain ...
11
votes
2answers
21k views

Why in Oracle 11gR2 I can't drop the materialized view with the same user that created it?

I created a materialized view with the DI_TEST_AL user, let's name it MY_MVIEW. It appears in the USER_OBJECTS table as MATERIALIZED VIEW, I try to drop it, I get a success message, but the object is ...
11
votes
1answer
3k views

Can I use Oracle Standard or Enterprise edition for my own training purposes?

Question is about Oracle licensing terms. I would like to learn more about Oracle Database administration. Unfortunatelly I am using 32 bit verison of LInux, so I can't install Oracle 11 XE (I can't ...
11
votes
2answers
13k views

Is there a timeout for a query over database link?

Edit/Preface: This question has been migrated from SO as I am particularly interested on the question on timeouts on DB link queries. The provided workaround from SO is somewhat OK, but I'm really ...
10
votes
1answer
113k views

Getting “ORA-00942: table or view does not exist” while table does exist

I'm fairly new to Oracle database. I have installed Oracle Database 11g R2 on Oracle Linux 6. I have successfully created a new database with dbca and connected to the database using: $ sqlplus "/ as ...
10
votes
3answers
6k views

How can I ensure that only one copy of a procedure is running in Oracle?

We have the need to ensure that only one copy of a particular procedure is running in Oracle. If it is already running and a user tries to open another, then it should error. Whats the best method ...
10
votes
2answers
5k views

Limit redo for materialized view complete refresh or manual equivalent

A materialized view(MV) log can be used to allow a MV to do a fast refresh which only modifies the data that has changed. However, various conditions prevent the MV from using the log and therefore ...
9
votes
3answers
14k views

I have a powerful machine with 70 GB RAM. How many Oracle instances with 20 GB can be created?

I have powerful machine with 70 GB RAM. I created one Oracle instance with 20 GB as sga_target. I am not able to create another Oracle instance with sga_target > 10G even when I keep the ...
9
votes
1answer
87k views

How to list all users that have grants over a package

I'm looking for some query to list all users that have grants over a package. For example, user Schema_A has been granted to execute package: B.MyPackage. I'm querying views or tables like: ...
9
votes
2answers
4k views

Oracle Shutdown Method

Shutting down a database before doing an upgrade or a patch can be done several ways. shutdown immediate; or shutdown abort; startup restrict; shutdown immediate; or shutdown abort; startup ...
9
votes
2answers
10k views

Is there a way to export an Oracle database to a CREATE DATABASE command?

I have an existing Oracle 11 instance, I want to export the database (which was created via DBCA) to an equivalent "CREATE DATABASE" command, handling the character set, etc. I'd also like to get a ...
9
votes
3answers
61k views

How to quickly startup/shutdown Oracle 11?

I am wondering what is the quickest way to properly startup/shutdown a Oracle DB daemon (Oracle 11.2, installed on a test machine). I need it for C/C++ programs that use the OCI/Pro*C API. I want ...
9
votes
1answer
29k views

Cannot change service name for Oracle

I'm trying to change the service name of an Oracle 11.2.0.3 installation on a Windows 2003 server. During installation the service name was defined with the default domain, but we'd like to get rid ...
9
votes
2answers
1k views

Why is a “non-single-group group function” allowed in a subselect but not on it's own?

Why does the first query not fail with the same error as the second: with w as (select 1 product_id, 10 units from dual union all select 2, 5 from dual) select sum(units) from (select product_id, sum(...
8
votes
3answers
54k views

How do you get the explain plan?

Can some one please explain a bit about explain plan, and how does one get the explain plan for a query. Also, if there is any sql script which can be used as utility for this, that would be great.
8
votes
2answers
2k views

are there significant differences with 500+ million row tables in Oracle?

I am in a database designer in a data warehouse environment. I am used to dealing with tables with a maximum of 1 millions rows and am now faced with tables with more than half a billion rows. Are ...
8
votes
1answer
17k views

How to find the schema name of a data pump dmp file?

I have been given a DMP data pump export file to import into my local Oracle instance. I've tried running this command line: impdp full=Y directory=DATA_PUMP_DIR dumpfile=MyDumpFile.dmp logfile=...
8
votes
2answers
12k views

Learning to Optimize SQL Queries and Understand Execution Plans - Resources?

I find myself writing more and more SQL queries at work (mostly Oracle 11g, but some SQL Server 2005-2008) and have started creating some pretty complex views for the rest of the analyst team. They ...
8
votes
1answer
923 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 ...
8
votes
2answers
59k views

How to migrate Oracle database to MySQL server? [closed]

Currently our application is running using Oracle 11g database. We are developing newer version of the application which runs on MySQL cluster. We need to migrate the data from Oracle database to ...
8
votes
1answer
3k views

Generate XML using Oracle XML schema

I have some XML schema definitions that have been registered using DBMS_XMLSCHEMA. I have created tables using the XMLTypes generated. I can create XML using XMLQuery and if I understand correctly, ...
8
votes
4answers
9k views

Return a fully dynamic table from an Oracle function

I'd like to write a function with two IN parameters where the first one is a varchar and the second a list of varchars. Based on these I want to return a table with varying column amounts and names of ...
7
votes
4answers
1k views

Does an IOT guarantee order in a select?

We need to add a priority column to a table that gets hit about 250 times a second, approx 170 selects, 125 inserts and 60 updates. The column will be a simple number(1). The priority does not matter ...
7
votes
2answers
45k views

Connecting to SQL Server using Oracle SQL Developer

I am using oracle sql developer to manage my oracle database. I recently added third party database jdbc drivers to be able to connect to my new MySQL and SQL Server installations. I need help with ...
7
votes
4answers
1k views

Can this business logic be enforced by a conditional database constraint?

I am trying to duplicate the business logic embodied an intranet C# web application in the database so that other databases can access it and work under the same rules. This "rule" seems difficult to ...
7
votes
1answer
7k views

Comments in EXPDB parameter file

Is there a way to put comments in a data pump export parameter file?
7
votes
1answer
175 views

Cardinality is so far off from reality

I've got a table where the cardinality for plans just seems waaaaaay too high - despite updating stats and even trying dynamic sampling for Oracle 11gR2. select count(*) from table1 where col1 = ...
7
votes
1answer
10k views

can I replace nulls in a PIVOT with zeroes?

I am using the PIVOT function in Oracle and am curious if I can replace the null values with zeroes? I know I can wrap the entire query in another SELECT and then use COALESCE on the values, but I am ...
7
votes
2answers
19k views

How can I view what NLS settings are active for other session?

I've got another session that I suspect isn't running with the 'proper' NLS settings for us in Oracle 11gR2. What can I query to show the NLS settings for a different active session - all of the NLS_*...
7
votes
7answers
22k views

Oracle 11g installation stuck at installation

I'm trying to install oracle 11g on fedora by following this tutorial but it stuck after I click Next in step 8. The screen does not go away even after several hours. There's no log file in ...
6
votes
2answers
4k views

What storage engines work with Oracle?

http://en.wikipedia.org/wiki/Database_engine mentions about database engines aka storage engines. What all storage engines can be used with the Oracle database?
6
votes
4answers
22k views

Why does = NULL not work in Oracle?

I recently realized that we need to use a special syntax IS NULL to compare a literal to NULL. Why does = NULL not work here?
6
votes
4answers
2k views

How do I sync instance A to instance B without losing any of the data already on instance B?

Like I said in a comment below, I'm no DBA and I'm still in a learning process. Here's my scenario : I have an Oracle server running a couple schemas (let' call it Source). What I would like to do ...
6
votes
2answers
31k views

SHA-256 hashing in oracle 11g

How can i encrypt or hash a password inside a trigger using sha-256 so that i can store the hashed value in another table using that trigger? Also how can I decrypt it??
6
votes
2answers
1k views

Defining constraints in `CREATE TABLE` statements

Recently I have been using a Database Abstraction Layer built by a Python web-framework called web2py (click for their DAL syntax). They include the option to include your constraints within the ...
6
votes
2answers
29k views

understanding ORA-01792 maximum number of columns in a table or view is 1000

We've recently migrated a server from Oracle 11 to Oracle 12c and ran into a few annoying issues. One of them is that a few a reports give the following error: ORA-01792: maximum number of columns ...