Oracle Scenarios Question: Download Questions PDF
Explain How do we increase the performance of %LIKE operator?
Answer:
The wildcard char % can be placed in one of three ways:
%searchwordhere%
searchwordhere%
%searchwordhere
The searchwordhere% is the fastest because it can use an index if one is specified on that column. The other two %searchwordhere%, and %searchwordhere would never use the index even if one is specified and thus result in slow table scans.
%searchwordhere%
searchwordhere%
%searchwordhere
The searchwordhere% is the fastest because it can use an index if one is specified on that column. The other two %searchwordhere%, and %searchwordhere would never use the index even if one is specified and thus result in slow table scans.
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