There are two basic approaches to the design of OS kernel. One is called microkernel approach, and the other is called ___ approach. In xv6, how many stacks are allocated for each process currently residing in the system? The PCB of a process in xv6 contains a pointer to the PCB of its parent process. The variable name of this pointer is ___. In xv6, there is a user-level C program that is used to create the first user process. The file name of this program is _______.

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Types of database architectures

A Database Architecture represents the Database Management System’s (DBMS) design (schema). The DBMS architecture makes it easy to understand the components involved in the database system and their relations. The DBMS architecture may vary based on the system on which it runs. Some systems contain both client and server machines whereas some run only on a server machine. Based on the architecture, the system can be classified as centralized, decentralized, or hierarchical.