General Database Access Engine 通用数据库访问引擎
All threads that access the database do so through the database engine.
访问该数据库的所有线程都是通过该数据库引擎来进行的。
Whether or not it is embedded, the database engine supports multiple simultaneous connections and access from multiple application threads.
无论是否嵌入，该数据库引擎都支持同时进行多个连接，并支持从多个应用程序线程进行访问。
The access plan is created by the database engine based on the SQL statement that is submitted.
访问计划是由数据库引擎根据提交的sql语句创建的。
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