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By default if you change the ownership or group name of a symbolic soft link then the orginal file will get affected. The orginal files user name and group name will be changed but the soft links owner name and group name will reamin the same.


In order to change the soft links owner name and group name we need to use '-h' option


chown -h test:test


In order to recursively search a string or pattern in Linux we can use '-r' option.

grep -lre “Error” /opt/*

-r will recursively search all the files and folder under the specified location.


AIX or Solaris or Unix:

AIX or Solaris or Unix version of grep command does not have the sophisticated '-r' option.


Find command's output can be substituted to another command.


Consider a scenario that you want to search for all log files in /tmp directory. Also want to see which log has SQL exception.


find /tmp -name "*.log" -exec grep -l "SQL" {} ;


the above command will search for all log files and if the file exist then it will execut

Linux Download youtube videos mozilla firefox

Posted by madeeswer 2188 days ago (Editorial)

First start the video and then press pause once the video starts buffering

go to the following direcotry


<home directory/.mozilla/firefox/cyvqrg9m.default/Cache

e.g. /home/test/.mozilla/firefox/cyvqrg9m.default/Cache


put ls -lrt


you can see the latest file. the file name will be created automatically b


Files can be transferred directly from one Linux server to another Linux server. many people use to transfer the file from Linux to Windows and Windows to Linux. This method will consume lot of time. If to want to transfer a file from one Linux Server to another then follow the below mentioned steps,

1. scp userid@hostname:source_file destiantion_file


Four Phases of Load Operation

Posted by jyothsnav 2424 days ago (Editorial)

Four Phases of Load operation:

LOAD Phase - four things happen during the load phase; data is read from the source file specified and loaded into the appropriate target table, index key values and table statistics are collected, point of consistency information is recorded and invalid data is placed into dump files.

(LOAD QUERY command is used to monitor the progress/status of

Difference between Import and Load utility

Posted by jyothsnav 2424 days ago (Editorial)

The import utility copies data using SQL insert or update operations, as a result each row processed must be checked for constraint compliance and all activities performed is recorded in the databases transaction log files.

Load utility, inserts data into a table by building data pages consisting of several individual rows of data and writing those pages directly to the table space con

Entity Relationship Diagrams

Posted by jyothsnav 2435 days ago (Editorial)

There are serveral notations for data modeling. The actual model is frequently called Entity Relationship model, because it depicts data in terms of the entities and relationships described in the data. An entity -relationship model (ERM) is an abstract conceptual representation of structured data. Entity-relationship modeling is a relational schema database modeling method, used in software e

Data Modeling

Posted by jyothsnav 2435 days ago (Editorial)

Data modeling is the process of creating a data model by applying formal data model descriptions using data modeling techniques.

Data modeling is a method used to define and analyze data requirements needed to support the business process of an organization. The data requirements are recorded as a conceptual data model with associated data definitions.

Actual i

Conceptual, logical and physical schemas

Posted by jyothsnav 2435 days ago (Editorial)

A data model instance may be one of 3 kinds:

Conceptual Schema: describes the semantics of a domain, being the scope of the model. For example, it may be a model of the interest area of an organization or industry. This consists of entity classes, representing kinds of things of significance in the domain, and relationships assertions about associations between pai

DB2 Load Utility

Posted by jyothsnav 2424 days ago (Editorial)

Like the Import utility, the LAOD utility is designed to read data directly from an external file and store it in a specific table. However, unlike when the import utility is used, when the Load utility is used the table to which data is to be copied must already exist in the database before the load operation is initiated.



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