Fine tune Database for BPM Suite 6

Issue

• We're experiencing some performance issues at the database level, and want to make some improvements at that level;
• We've installed BPMS 6.2.3.GA running on a Oracle 12c Database. Please provide the link to download the sql scripts for fine tuning this database;
• We have a performance problem with BPMS, it is taking a long time for the tasks to be executed, when analyzing it was detected that 80% of the time goes in the elimination of the taskVARIABLEIMPL table, the time to eliminate records is taking 42.1 seconds on average.