Hi there @pruthvi1286,
print screen @izaychik63 posted is from new database nodes available in KNIME 4.0 version.
As for legacy database nodes you are using there is no fetch size option that can be configured inside node. Instead fetch size can be configured in knime.ini configuration file. Check this topic: Poor performance in Database Reader Node
Additionally network connection can be bottleneck so check that as well.
What database are you using? I suggest updating to newest KNIME version as there are new database integration nodes with improved features and performance 
Br,
Ivan