How does SQL compiler work?

Question

Every SQL database engine contain two main components Compiler and Virtual machine to execute the queries. The compiler read the query and convert that query to appropriate byte code, then that byte code evaluated by the virtual machine and a proper response given back to the client. 16 янв. 2020 г.

How is SQL compiled?

PL/SQL executes in a virtual machine, and it first translates (compiles) your code into virtual machine code, sometimes called bytecode or mcode. This is basically the same model that Java uses. When it is time to actually run your code, however, that bytecode is translated (interpreted) into system calls.

How does SQL engine work?

The SQL storage engine writes to and retrieves data from a data warehouse server, often done by converting the data to a compatible format such as a JSON file. To retrieve the data, the query processor accepts, parses, and executes SQL commands for the data warehouse to forward to an application server.

How does SQL parser work?

The parsing stage involves separating the pieces of a SQL statement into a data structure that other routines can process. The database parses a statement when instructed by the application, which means that only the application, and not the database itself, can reduce the number of parses.

Does SQL use interpreter or compiler?

Like most fourth-generation languages, SQL requires an interpreter that translates rather than compiles code.

Expert · Answer