Advantage and Disadvantage Of PHP Limitation of PHP

            * ADVANTAGE OF PHP HIERARCHICAL DATATABLE MODELS *

1. Conceptual Simplicity : 

As the information is represented in form of tree structure, it is easy to view, understand, and retrieve the data. This helps the database designer to obtain conceptual clarity of relationship. 

2.. Database security : 

Security is provided by DBMS. Thus Programming effort is decreased  compared to file system in which programmer has to write the programs for implementing security. 

3. Data independence : 

If changes are made in design of database, DBMS takes care of cascading it throughout the system. There is no need to make change in system. 

* DISADVANTAGE OF PHP HIERARCHICAL DATABASE MODELS  *

1. Complexity : 

To implement the database using hierarchical model. programmer needs to have detailed knowledge of how the data is’ stored has to traverse entire tree for the same. 

2. Data Redundancy : 

To implement many to many ‘relationships amongst data repetition of data is required. This leads to increased data red 

3. Anomalies :

You can not insert a new record without depending on other records. Deleting one record will] delete all the records which are depend on that record. Updating of one record requires to make changes in many places.