Explain the term optimization and performance tuning
Explain the term optimization and performance tuning and its work in practical projects?
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Performance tuning and optimization of a query includes collecting statistics on link columns, ignoring cross product join, selection of suitable primary index (to ignore skewness within storage) and by using secondary index. Ignoring NUSI is advisable.
What do you understand by the term snapshot replication in DBMS?
Describe the three types of data sources which are used with ODBC?
Explain what is Structured Query Language (SQL)?
Specify the vaious types of data warehouses?
Briefly describe the five elements of an Information Systems Architecture and their relationship to data.
Briefly describe the differentiation between star and snowflake schemas?
Elucidate Where to keep informatica rejected data? How to remove the informatica rejected data?
In which case the functional dependencies are not equations? Describe briefly?
Give a brief introduction of the term critical column?
Explain about a Cartesian product?
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