A DDBMS may be classified as homogeneous or heterogeneous. Compare and contrast these two types of distributed systems.
What will be an ideal response?
In a homogeneous system, all sites use the same DBMS package. In a heterogeneous system, sites
may run different DBMS packages. Not only may the packages be different, but the packages
may not use the same underlying data model, so that there may be a mixture of relational, network
and hierarchic DBMSs.
Homogeneous systems are much easier to design and manage. This approach provides
incremental growth, making the addition of a new site to the distributed system easy, and
increased performance, by exploiting the parallel processing capability of multiple sites.
Heterogeneous systems usually result when individual sites have implemented their own database
solutions, and integration is considered at a later date. In a heterogeneous system, translations are
required to allow the different DBMSs to communicate. To provide DBMS transparency, users
must be able to make requests in the language of the DBMS at the local site. The system then has
the task of locating the data and performing any necessary translation. Data may be required from
another site which may have:
? different hardware
? different DBMS packages
? different hardware and different DBMS packages.In a homogeneous system, all sites use the same DBMS package. In a heterogeneous system, sites
may run different DBMS packages. Not only may the packages be different, but the packages
may not use the same underlying data model, so that there may be a mixture of relational, network
and hierarchic DBMSs.
Homogeneous systems are much easier to design and manage. This approach provides
incremental growth, making the addition of a new site to the distributed system easy, and
increased performance, by exploiting the parallel processing capability of multiple sites.
Heterogeneous systems usually result when individual sites have implemented their own database
solutions, and integration is considered at a later date. In a heterogeneous system, translations are
required to allow the different DBMSs to communicate. To provide DBMS transparency, users
must be able to make requests in the language of the DBMS at the local site. The system then has
the task of locating the data and performing any necessary translation. Data may be required from
another site which may have:
? different hardware
? different DBMS packages
? different hardware and different DBMS packages.In a homogeneous system, all sites use the same DBMS package. In a heterogeneous system, sites
may run different DBMS packages. Not only may the packages be different, but the packages
may not use the same underlying data model, so that there may be a mixture of relational, network
and hierarchic DBMSs.
Homogeneous systems are much easier to design and manage. This approach provides
incremental growth, making the addition of a new site to the distributed system easy, and
increased performance, by exploiting the parallel processing capability of multiple sites.
Heterogeneous systems usually result when individual sites have implemented their own database
solutions, and integration is considered at a later date. In a heterogeneous system, translations are
required to allow the different DBMSs to communicate. To provide DBMS transparency, users
must be able to make requests in the language of the DBMS at the local site. The system then has
the task of locating the data and performing any necessary translation. Data may be required from
another site which may have:
? different hardware
? different DBMS packages
? different hardware and different DBMS packages.In a homogeneous system, all sites use the same DBMS package. In a heterogeneous system, sites
may run different DBMS packages. Not only may the packages be different, but the packages
may not use the same underlying data model, so that there may be a mixture of relational, network
and hierarchic DBMSs.
Homogeneous systems are much easier to design and manage. This approach provides
incremental growth, making the addition of a new site to the distributed system easy, and
increased performance, by exploiting the parallel processing capability of multiple sites.
Heterogeneous systems usually result when individual sites have implemented their own database
solutions, and integration is considered at a later date. In a heterogeneous system, translations are
required to allow the different DBMSs to communicate. To provide DBMS transparency, users
must be able to make requests in the language of the DBMS at the local site. The system then has
the task of locating the data and performing any necessary translation. Data may be required from
another site which may have:
? different hardware
? different DBMS packages
? different hardware and different DBMS packages.
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