An adaptive algorithm for detection of duplicate recordsPresentation Transcript
An Adaptive Algorithm for Detection of Duplicate Records Presented By: Rama kanta Behera IT200127207 Under the guidance of : Miss Ipsita Mishra
A “ records set ” is a list of prior distinct records. A new record is to be verified for a duplicate against the records set
A database is a collection of related data.
Various Algorithms like
Matching learning algo,
Learnable string similarity measures
Reduced cost of duplicate record detection.
Perfect scalability of one such detection procedure.
Cache prior information of distinct records and thus cause retaining of prior records redundant for furthering the search
Keep the algorithm adaptive.
The Brute Force Method
This method consumes complexity of the order number of records in the records set and requires all prior records to be stored.
Method by Rail et. al
The comparison of a new record against the records set is reduced from being full text match to comparing two integers
OUTLINE OF THE PROPOSED SOLUTION The central idea behind the present algorithm is based on the fundamental property of primality of numbers I f(x) Record set Integer number space Fig: hashing I P Record set Integer number Prime number f(x) g(x) Fig: Extended hashing into prime space
r1 r2 … rn I1 I2 … In P1 P2 … Pn PRODUCT( P prior) f(x) g(x) P1*p2 …*pn= P prior Fig: The complete algorithm
REALIZATION OF THE ALGORITHM
Two functions f(x) and g(x) are to be realized for the implementation of the algorithm.
STEPS OF THE ALGORITHM Step 1 : For each new record, hash is performed and unique hash value (Hnew) for each distinct record is obtained. Step 2 : Hnew is mapped to its corresponding unique prime (Pnew). Step 3 : Pprior is divided with Pnew. If Pnew exactly divides Pprior, then the corresponding record to Pnew is a duplicate and already exists in Pprior. Else, Pnew is a distinct record. Step 4 : If Pnew is a distinct record, Pprior is multiplied with Pnew and the result is stored back in Pprior. Thus updating Pprior renders the algorithm adaptive.
IMPLEMENTATIONS There are three important implementation details that need to be discussed
Size of Records set
Use of Logarithms
Subsets of Records set
A new approach to handle duplicate records is presented
This approach combines the concepts of number theory and algorithmic to solve the oftener felt problem of “duplicate record detection”.