What is the default optimization(CBO/RBO) method choose in Oracle 9i DB?

What is the default optimization(CBO/RBO) method choose in Oracle 9i DB?
Note : If we set the OPTIMIZER MODE as CHOOSE

1) So you mean to say that, for all the tables if we are maintaining statistics, by default it will go for CBO, else RBO right?Yes, unless you dont specify a hint RULE to your queries. At least one table contains statsitics in a two or more table join select statement, oracle uses CBO and calculates statistics using their no. of blocks and other stuff, some internal calculations.
Also, becarefull, old statistics can lead optimizer to choose very pool plan that impact query performance.
2) If we are using CBO, then what will be the order of execution in the where clause, Is it from top to bottom, or reverse?If its a single table with where clause, then, oracle choose either full table scan, or index range scan depends upon the column mentioned in the where clause and availabl indexes.
If query contains multiple tables, then, oracle has to decide between join methods, such as, nested loop, hash join, sort merge join and etc.
3) And also If we are using RBO, then what will be the order of execution in the where clause, Is it from top to bottom, or reverse?
RBO uses its internal calculation to produce the execution plan, more probably gives preference to indexes if a column has an index which appears in the where cluase.
Jaffar

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What are the default userid and password to logon to Oracle Applications

What are the default userids and passwords to logon to Oracle Applications Manager?

There r no any default password for Application Manager,
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PUBLIC database account on oracle 10g - what are the default privilages?

Hi there,
I was wondering what are the default privileges to PUBLIC database account on oracle 10g R2. Could somebody explain it? Thank you in advance.

There is not a user PUBLIC. There cannot be a user PUBLIC. Users and roles share the same name space so if there is a role PUBLIC, there can not be a user PUBLIC.
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sys@esdb01:pncl# /
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========== ============================== ==========
         0 SYS                                     1
         1 PUBLIC                                  0
         2 CONNECT                                 0
         3 RESOURCE                                0
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If we dont specify what is the default buffer size in BufferedWriter. How to increase/decrease the size of it?
What is the purpose of flush?
If flush() is not used, only partial content is written to the file. Is it because of the default size of the buffer.

THis is the bufferedwriter class, it helps to look at them, look at the bold underlined, thats answers your defualt buffer size
* @(#)BufferedWriter.java 1.26 03/12/19
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
package java.io;
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* @see FileWriter
* @see OutputStreamWriter
* @version 1.26, 03/12/19
* @author Mark Reinhold
* @since JDK1.1
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What is the default password for SDM in SP15

Initial password for SDM
Posted: Mar 22, 2006 2:40 PM Reply
I have installed the SP15 SneakPreview. When i am trying to deploy a webdynpro application into portal from NWDS2.0.15, it is asking for SDM password.
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thanks

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HR Madrid

What are the parameters in Call transaction method?

Hi ABAPER'S,
Please give me what are the parameters in call transaction method?
Thanks,
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MODE <mode>
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<bdc_tab> : Internal table of structure BDCDATA.
<mode> : Display mode:
A
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E
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N
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S
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A
Asynchronous
L
Local update
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<Error_handling>.
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Value
Explanation
0
Successful
<=1000
Error in dialog program
> 1000
Batch input error
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Name:
Explanation:
SY-MSGID
Message-ID
SY-MSGTY
Message type (E,I,W,S,A,X)
SY-MSGNO
Message number
SY-MSGV1
Message variable 1
SY-MSGV2
Message variable 2
SY-MSGV3
Message variable 3
SY-MSGV4
Message variable 4
Error Analysis and Restart Capability
Unlike batch input methods using sessions, CALL TRANSACTION USING processing does not provide any special handling for incorrect transactions. There is no restart capability for transactions that contain errors or produce update failures.
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write out or save the message table
use the BDCDATA table that you generated for the CALL TRANSACTION USING to generate a batch input session for the faulty transaction. You can then analyze the faulty transaction and correct the error using the tools provided in the batch input management facility.

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Dear Experts,
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Hi,
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What is the default optimization(CBO/RBO) method choose in Oracle 9i DB?

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