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Documents have different index data
We can done with the help of Primary concept in Sql Server.
Data entry plays a vital role in the success of E-Business. For an E-Business the automated data entry process helps to minimize duplicate entry, speeds up the process, and allows instant data search between records. This results in saving of time and money for the business.
When data is duplicated, it means that there are two or more identical records or entries in a dataset. This can happen accidentally due to errors in data entry or data integration processes. Duplicate data can lead to inaccuracies in analysis and reporting.
Index files are auxiliary file stored in database used in faster accessing of data , and it is important especially when database file size growing exponentially. Today world storage is not a problem, but retrieval/searching on certain criteria is problem.Index files- Secondary or auxiliary files that help speed up access in primary filesIndexes or access structure: data structure -- data structure used for fast access.Primary index: An index structure that is defined on the ordering field (that is used to physically order records on disk in sorted file organization)Secondary index : used to index field that are neither ordering fields nor key fields(there is no assurance that the file is organized on key field or primary key field). One index entry for every tuple in the data file(dense index) contain the value of the indexed attribute and pointer to the block /recordWhat happens when Key field is used as index filed in Secondary Index?Since the key fields are unique , number of index entries equal to number of recordsData records need not be sorted on diskFixed length records for index fileWhat happens when non-Key field is used as index filed in Secondary Index?When a non key filed is indexed, indexed field entry need not be unique, there can be duplicate entry.How to handles these duplicate entry?There methods are there to handle this duplicate valueDuplicate index entriesVariable length records (one value should point more than one records)Extra redirection levels
A clustered index in a database can improve the retrieval speed of data, as it physically orders the rows of a table based on the indexed column or columns. It can also help reduce the amount of data pages that need to be read when querying data. However, because the data is physically ordered based on the clustered index column, updates to this column can be expensive.
alt+d for delete any entry
Data backups
Index is a data structure that improve the performance of data.
See duplicate entry.
original, duplicate & exchange control copy
The benefit for your data entry people is to simplify data entry.