Questions tagged [oracle]

All versions of Oracle database. Add a version-specific tag like oracle-11g-r2 if that context is important in the question. Do not use for Oracle products such as applications or middleware or other database products owned by Oracle, like MySQL or BerkeleyDB.

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14
votes
1answer
13k views

Why does SQL*PLUS need a slash after CREATE TYPE?

I just had the problem that I defined a Type and tested it in TOAD and all was OK. But running under SQL*PLUS it threw an error. Example: CREATE OR REPLACE TYPE MyType AS OBJECT ( Item1 NUMBER, ...
3
votes
1answer
598 views

Oracle monitoring db status

I am looking for a way to monitor Oracle database status (health) via PHP script executing SQL query. There are system variables containing actual number of connection, sessions, work load, etc... ...
4
votes
2answers
466 views

Searching for a Data Dictionary for SQL or Oracle

I am looking for metadata specifications (data dictionary) for SQL Server and Oracle databases. By metadata map, I mean a definitive description of what objects make up database model and their ...
6
votes
2answers
2k views

Updating rows conditionally with a gapless ascending value

A user has a table they would like to update. Depending on the data in other columns they want a particular column to be updated with an ascending value starting from 1 that is gap-less. The rows ...
5
votes
1answer
4k views

database duplication VS database replication

Is there a difference between duplication and replication with reference to a database? I am not sure if I am correct at all, but duplication means to me that we are copying bit by bit without ...
2
votes
2answers
18k views

SGA_MAX_SIZE and SGA_TARGET

We recently increased sga_max_size from 2g to 4g but didn't increase sga_target. Is it OK not to increase sga_target? The reason we wanted to increase sga is to reduce wait time on sequential reads in ...
5
votes
2answers
9k 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
8k views

Multiple Oracle Instances — is this a good practice?

One of my clients has deployed our product's db into a Solaris machine which already has 3 instances of Oracle. So, right now there are 4 instances of Oracle running on the same machine. And now we're ...
3
votes
1answer
155 views

Is there any tool to convert Oracle commands to MySQL?

Is there any tool which I can use to convert Oracle commands to mysql commands?
18
votes
4answers
61k views

How can I unload Oracle database tables into a csv files?

I need to retrieve certain data from an Oracle 11g release 1 database and provide it as one or more CSV files. The data resides in multiple tables and/or views. All this should work via the command ...
0
votes
2answers
1k views

Is where x = 0 or x is null to be replaced by where isnull(x, 0) = 0 resp. where NVL(x, 0) = 0

Think of x as a column containing null, 0, 1. Only less than 1 % of the rows contain 1. There is no logical difference between 0 and Null. Is it a good idea to insist, that isnull rather than NVL is ...
6
votes
3answers
1k views

Oracle Advanced Queuing LIFO

With Oracle's Advanced Queuing is there a way to dequeue messages in a LIFO (last in first out) order? There is an indication through a lack of information that this is not an option, but perhaps ...
2
votes
1answer
2k views

What is the purpose of sqlbulkcopy's useinternaltransaction property?

I'm just testing my PowerShellScript to do bulkcopy of multiple tables between sql-server and oracle Databases. When the destination is Oracle, than I can monitor the progress by by executing select ...
4
votes
2answers
6k views

How can I catch the output of DBMS_OUTPUT.PUT_LINE when executing a block using [Oracle.DataAccess.Client]?

In my oracle Database if have the following table: Create table Test_call_count ( count number(10) ); insert into Test_call_count values (0); Now I can run the following PowerShell script if ($...
6
votes
4answers
665 views

Group data by non-unique keys by distinct time range

I have data in an Oracle table like the following: PROJ_NBR STATUS START_DT AL20 AC 1/14/2010 4:31 AL20 AC 1/14/2010 4:32 AL20 AC ...
9
votes
1answer
625 views

How can I rewrite for SQL Server a trigger that writing for Oracle?

How can I rewrite for SQL Server a trigger that was originally written for Oracle ? Here is my Oracle trigger code: CREATE OR REPLACE TRIGGER P000KUL_TEST BEFORE INSERT ON P000KUL REFERENCING NEW AS ...
8
votes
2answers
4k views

What is the difference between terminating an Oracle sql statement with semicolon or with a slash on the next line?

The following two queries seem to be equivalent when executed in sql*plus: 1. select * from user_tables; 2. select * from user_tables / Is there any difference between both versions?
19
votes
3answers
24k views

What is the difference between Oracle's VARCHAR and VARCHAR2 datatypes?

When migrating tables coming from other DBMSs to Oracle, one of the standard tasks is to replace all VARCHAR(n) fields with VARCHAR2(n) fields (provided n <= 4000). Why does Oracle call this ...
5
votes
2answers
35k views

How do I allow users to see grants, view definitions, PL/SQL, etc in a database without granting them access to change those objects

As a developer, I need to be able to access the design of the database/database objects from production so I can ensure I'm working with the latest and greatest version of the objects I'm developing ...
1
vote
1answer
13k views

How to take undo datafile offline ,which is in recovery mode?

I am trying to take undo datafile in offline mode using following command alter database datafile '<datafile path>' offline; this datafile is in recovery mode. Oracle shows message as ...
2
votes
2answers
6k 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
61k 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 ...
4
votes
4answers
2k views

Best method to give two Oracle databases on the same server access to common data

With a production and a test database on the same server, how should access be provided to some common quarterly update tables for both databases? It is possible to put these tables into a third ...
12
votes
2answers
22k views

Why do we need to backup Oracle archive logs along with datafiles

Oracle® Database Backup and Recovery Basics 10g Release 2 (10.2) says that Archived redo logs are the key to successful media recovery. Back them up regularly. But, I wonder, why backups of ...
6
votes
3answers
138k views

Oracle SQL - CASE in a WHERE clause

Is it possible to somehow do this? WITH T1 AS ( SELECT 1 AS SEQ, 'NOTHING 1' AS SOME_TYPE FROM DUAL UNION ALL SELECT 2 AS SEQ, 'NOTHING 2' AS SOME_TYPE FROM DUAL UNION ALL SELECT 3 AS SEQ, '...
3
votes
2answers
155 views

I'm performing a post-mortem on an Oracle database that's crashed its' host. Where should I begin?

I have an Oracle database (10.2.0.1.0 I believe) on a Windows 2003 server that I believe has successfully crashed the OS itself twice. Debates on platforms and stability aside, the evidence suggests ...
3
votes
3answers
5k views

cursor: pin S wait on X in 11g

This has been one of top5 wait events in our database, even though there were not many waits but we see it as a potential threat, we want to find the root cause and solution. Any advice will be ...
11
votes
4answers
57k views

How to find the actual space being consumed by indexes on a table in Oracle?

I want to find the actual space being consumed by indexes on a table in oracle 10g . I do not intend to include the space reserved by oracle for future usage. (The overhead by oracle should not be ...
5
votes
3answers
3k views

Alternatives to an INSERT Trigger

Looking for an example code in Oracle to do the same. i.e. Remove an insert trigger on table T1 whose job is to create a row in T2 based on the derived data. How would this PL-SQL api look like? ...
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 ...
6
votes
2answers
7k views

What is the difference between ROLE and PRIVILEGE for Oracle?

Is role a collection of certain privileges?
5
votes
2answers
2k views

What is the difference between these two create table statements?

a) SQL> CREATE TABLE xml_tab1(poDoc XMLTYPE); Table created. SQL> desc xml_tab1; Name Null? Type ----------------------------------------- -------- --...
2
votes
1answer
655 views

SAN Storage & Server for Oracle Replication

I need a 2-3 TB storage server group for Oracle Database. We want SAN Storage & Server for Oracle Replication, but not Microsoft Storage Server. For example : HP DL380 G6 as a server and EMC ...
9
votes
1answer
27k views

How can I import the contents of an Oracle database into Visio to create an Entity Relationship Diagram?

I have an Oracle database, and I would like to create an ERD in Visio 2007 Pro. I have so far looked at DBMS_METADATA.GET_DDL commands to generate DDL. I know that I can import an Access DB into ...
6
votes
1answer
724 views

How can I make the audit system create new audit files if they already exist?

I am trying to make my audit files easier to read, I have audit trail configured as xml,extended. The problem is that if my server gets busy and reuses the pids - the logs are being appended to the ...
1
vote
1answer
5k views

Local package won't compile when remote package recompiles. (Oracle)

We have a package on a 10.2.0.4 database(A) and a package on an 11.2.0.2 database(B) that references A's package. When something on A changes that requires the package on A to do an implicit re-...
6
votes
1answer
2k views

Using sys.diana and sys.pidl to parse PL/SQL

It seems to me that it should be possible to parse existing PL/SQL with the packages sys.diana and sys.pidl, but I have found nothing on the internet with the exception of a few scripts that seem to ...
19
votes
6answers
16k views

Oracle Creating ER Diagrams and Data Dictionaries

I am new to Oracle Databases and would like to develop a data dictionary and ER Diagrams for our existing databases. Do you have any tips, scripts, tools for doing so?
4
votes
2answers
74k views

Expired archived logs not deleted from RMAN catalogue

If I issue a LIST EXPIRED command in RMAN, I see a list of files with expired status, that is, they exist in the catalogue, but not on the disk (verified by ls). After issuing CROSSCHECK and DELETE ...
4
votes
3answers
2k 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 ...
6
votes
2answers
2k views

EXP-00085 warnings while doing full backup

During a full export of my Oracle 10.2.0.2 database, I encounter the following warnings [...] . exporting post-schema procedural objects and actions EXP-00008: ORACLE error 6502 encountered ORA-06502:...
5
votes
2answers
12k views

Calling SQL Loader From SQL Plus

I was wondering if there was a way I can execute a SQL Loader script from SQL Plus. We are using Oracle 10g.
12
votes
3answers
32k views

Is there any difference between Rem and — comments for SQL*Plus?

On SQL*Plus prompt, both Rem and -- qualify as comment indicators: Rem this is a comment -- this is also a comment create table emp ( id number primary key, name cvarchar2(40)); Is there any ...
4
votes
7answers
10k views

What database front end do you use? [closed]

What database front end do you use? It should let you manage databases, tables, indexes and ideally even data records. And it should ideally be free so we can all use it too. Databases that it could ...
18
votes
6answers
72k views

Best way to delete very large recordset in Oracle

I manage an application which has a very large (nearly 1TB of data with more than 500 million rows in one table) Oracle database back end. The database doesn't really do anything (no SProcs, no ...
6
votes
2answers
3k 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 ...
4
votes
1answer
177 views

Oracle setup required for heavy-ish load

I am trying to make a comparison between a system setup using Hadoop and HBase and achieving the same using Oracle DB as back end. I lack knowledge on the Oracle side of things so come to a fair ...
44
votes
14answers
155k 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 ...
7
votes
4answers
25k views

Building Dynamic Oracle Where Clause

I'm working on application that uses dynamic query to do a select statement based on user input, after discussing security with DBAs they want me to convert my dynamic select statement into Stored ...
5
votes
1answer
707 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 ...