Data distribution in other RDBMS

  Data distribution in other RDBMS It is sequential so, storing and retrieve take  time So that take lot of time storing and retrieval   Data distribution in tera data

1. a) Automatic A sit is automatic, it loads any volume of data
2. b) uniform(or) even(or)randomly It loads the data uniformly or parallel so that distribution and retrieval faster.

This automatic and uniform event is possibly in tera data, because of indexes.   Data Access Mechanism

1. a) Full table scan (FTS)
2. b) Primary index retrieval (P.I)
3. c) Secondary index retrieval(S.I)

  A) FULL TABLE SCAN(FTS)     i) System performance In case of FTS System performance decreased   ii) Situation to Get a) If the indexed columns are not used in the query b) An index is used in non-equal to test c) Range of value specified in primary index   Ex:- b)Sel*from party where party name like’V%’

1. C) Sel* from party where party income between 5000 and 7000 

  FTS Process

1. i) It scans every data block in table
2. ii) All Amp scan for the table portion

  Remedy Take appropriate PI to avoid FTS To Apply PI to avoid FTS To used PI to avoid FTS.