Hi @Vipul Sharma Thank you for posting your question on Microsoft Q&A and for using Azure services.
My understanding is that you want to know how much is being inserted every month or every day to understand the usage of DB tables.
In addition to @Alberto Morillo 's answer. The Data ingestion per solution chart on the Usage and Estimated Costs page for each workspace shows the total volume of data sent and how much is being sent by each solution over the previous 31 days. This helps you determine trends such as whether any increase is from overall data usage or usage by a particular solution.
If you can find information on data usage in log analytics workspace.