we recently upgraded our db from 11g to 12c, now db with 12.2 version on linux. the db is mostly of oltp type, having around 150GB application data and tables having approx 5GB to 10Gb in size, after upgradation the performance of db is degraded, we believe we can improve that by changing db parameters. Can you pls suggest any oracle parameters to look for to improve performance apart from memory related. and any parameters specific to 12.2 version ?
ORACLE 12c parameter to change , as db performace is a bottleneck with default parameters
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Please check wehat is the value of parameter OPTIMIZER_FEATURES_ENABLE i.e. whether you are using 11g optimizer of 12c optimizer. Sometimes 12c optimizer dont perform well along with that check the values of OPTIMIZER_ADAPTIVE_PLANS and OPTIMIZER_ADAPTIVE_STATISTICS. Please refer to this article. I have faced a similar performance issue after migration from 11g to 12.2c, so please share yur feedback after checking these parameter values.