Pls answer the below questions
1.What are the best Practices for database?
2.What are the different types of logfile?
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I think the search function in the documentation should help you. Regarding your questions you might want to start here
https://docs.appian.com/suite/help/21.1/cdt_design_guidance.html
docs.appian.com/.../Customizing_Application_Logging.html
Thank you Stefan