In case you have an oracle exadata database machine, always use 100% percent for collecting optimizer statistics on your tables/schemas , in order to benefit from the smart scans .
http://uhesse.com/2012/07/04/no-smart-scan-with-auto_sample_size/
Video on Client Side Failover in RAC
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I've posted a new video demonstrating Client Side Failover defined by the
tnsnames.ora file
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