what are the disadvantages of centralized database system
it is time consuming
discuss database and field functions
No one knows
if the computer crashes you can't use it.
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Disadvantages of database migration can include potential data loss or corruption during the migration process, extended downtime for applications relying on the database being migrated, and compatibility issues with the new database system leading to performance degradation. Planning and testing are crucial to mitigate these risks.
Ultimately PHP is a programming language and MySQL is a database language. Using PHP with MySQL is a nice combination with built-in support and the simplicity of it all. However, there aren't a lot of disadvantages of using PHP with a database, it just allows for better data organization and whatnot. There are definitely advantages and disadvantages to using a database other than MySQL (such as MongoDB or PostgreSQL).
When we use Normalisation it does not allow some of the modifications of the database. Another disadvantage of Normalisation is that it is only applicable in the Relational Database Management System.
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Some disadvantages of the hierarchical database model include complexity in representing certain types of relationships, limited flexibility in querying data due to its rigid structure, and potential data redundancy issues as each child can only have one parent record.
Re-organizing and sorting the data plus adding data fields.