sql server本身是收费的，虽然网上激活码管理较为松散，但使用到生产环境依旧存在风险。 sql server是否存在不付费也能用于生产环境的版本呢？
sql server 各版本中，仅Express版本允许不付费使用到生产环境，但是需要忍受数据库存储最大为10G的限制(数据库大小到达10.5后无法继续扩展)，而且无法关闭用户使用数据后台自动发送给微软的选项。
sqlserver localdb能否不付费用于生产环境版本呢？localdb属于Express版本的一部分，限制与Express版本相同。
下表为sql server各版本比较：

Feature

Enterprise

Standard

Web

Express with Advanced Services

Express

Maximum compute capacity used by a single instance - SQL Server Database Engine1

Operating system maximum

Limited to lesser of 4 sockets or 24 cores

Limited to lesser of 4 sockets or 16 cores

Limited to lesser of 1 socket or 4 cores

Limited to lesser of 1 socket or 4 cores

Maximum compute capacity used by a single instance - Analysis Services or Reporting Services

Operating system maximum

Limited to lesser of 4 sockets or 24 cores

Limited to lesser of 4 sockets or 16 cores

Limited to lesser of 1 socket or 4 cores

Limited to lesser of 1 socket or 4 cores

Maximum memory for buffer pool per instance of SQL Server Database Engine

Operating System Maximum

128 GB

64 GB

1410 MB

1410 MB

Maximum memory for Columnstore segment cache per instance of SQL Server Database Engine

Unlimited memory

32 GB

16 GB

352 MB

352 MB

Maximum memory-optimized data size per database in SQL Server Database Engine

Unlimited memory

32 GB

16 GB

352 MB

352 MB

Maximum memory utilized per instance of Analysis Services

Operating System Maximum

Tabular: 16 GB MOLAP: 64 GB

N/A

N/A

N/A

Maximum memory utilized per instance of Reporting Services

Operating System Maximum

64 GB

64 GB

4 GB

N/A

Maximum relational database size

524 PB

524 PB

524 PB

10 GB

10 GB

参考：
https://docs.microsoft.com/en-us/sql/sql-server/editions-and-components-of-sql-server-2017?view=sql-server-2017
https://docs.microsoft.com/zh-cn/sql/database-engine/configure-windows/sql-server-express-localdb?view=sql-server-2017
https://stackoverflow.com/questions/29929640/sql-localdb-size-limit-for-non-express-editions