Cost-Based Lightweight Storage Automatic Decision for In-Database Machine Learning

Storage structure decision for a database aims to automatically determine the effective storage structure according to the data distribution and workload. With the integration of machine learning and database becoming closer, complex machine learning tasks are directly executed in database, and need the support of efficient storage structure. The existing storage decision methods are mainly oriented to common workloads and rely on the decision of experienced DBAs, which has low efficiency and high risk of error. Thus, an automated storage structure decision method for in-database machine learning is urgently needed. We propose a cost-based lightweight row-column storage automatic decision system. To the best of our knowledge, this is the first storage structure selection for machine learning tasks. Extensive experiments show that the accuracy of the storage structure above 90%, shorten the task execution time by about 85%, and greatly reduce the risk of decision error.