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File Manager
File manager handles the allocation of space on disk storage. It starts and maintains the list of structures and indices described in the internal schema that is used to show information stored on disk. Therefore, the file manager does not directly manage the input of data and physical output. It passes the requests on to the suitable access methods, which either write data or read data from into the system cache or buffer. The file manager can be executed using an interface to the existing file subsystem given by the operating system of the host computer or it can have a file subsystem written especially for the DBMS.
Define Serializable schedule Serializable schedule: An interleaved schedule of much more than one transaction is known as a serializable schedule, if it is equal to some serial
Explain CNT in the respects of QBE ? CNT: It is one of the aggregation commands given in QBE. It is used to identify number of tuples
What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
Increases efficiency : Data is stored close to most often used site, therefore retrieval would be faster. Also, data that is not required by local applications is not stored, there
please give me introduction to full data in D B M S in a short assignment
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
What is vertical fragmentation? Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
What is a primary index? A primary index is an index whose search key also explains the sequential order of the file.
Which language has presently become the defacto standard for interfacing application programs along with relational database system? The language which has recently become the
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