Numerous variables, such as the volume of transactions, block size, and data storage needs, affect the size of the Bitcoin blockchain database, which houses all transaction records, but it keeps growing as new transactions are added to the network. And also size is subjected to change and may have changed from my previous update.

Since efficiency varies depending on the situation, there are no certain tests that show the size of the Bitcoin database to be the most efficient. In contrast, Bitcoin's database size is frequently found to be more efficient than that of conventional banking systems when it comes to specific tasks like transaction processing and verification.