Database audit provides basic, professional, and advanced editions. You can select one of them as needed.

Table 1 describes the database audit editions.

**Table 1** Database audit editions
Version	Maximum Databases	System Resource	Performance
Basic	3	CPU: 4 vCPUs Memory: 16 GB Disk: 500 GB	Peak QPS: 3,000 queries/second Database load rate: 3.6 million statements/hour Stores 400 million online SQL statements. Stores 5 billion archived SQL statements.
Professional	6	CPU: 8 vCPUs Memory: 32 GB	Peak QPS: 6,000 queries/second Database load rate: 7.2 million statements/hour Stores 600 million online SQL statements. Stores 10 billion archived SQL statements.
Advanced	30	CPU: 16 vCPUs Memory: 64 GB	Peak QPS: 30,000 queries/second Database load rate: 10.80 million statements/hour Stores 1.5 billion online SQL statements. Stores 60 billion archived SQL statements.

A database instance is uniquely defined by its database IP address and port.
The number of database instances equals the number of database ports. If a database IP address has N database ports, there are N database instances.

Example: A user has two database IP addresses, IP₁ and IP₂. IP₁ has a database port. IP₂ has three database ports. IP₁ and IP₂ have four database instances in total. To audit all of them, select professional edition DBSS, which supports a maximum of six database instances.
To change the edition of a DBSS instance, unsubscribe from it and apply for a new one.
Online SQL statements are counted based on the assumption that the capacity of an SQL statement is 1 KB.

Editions