What is RDBMS KERNEL?

What is RDBMS KERNEL?
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Answer :

Two important pieces of RDBMS architecture are the kernel, which is the software, and the  data dictionary, which consists of the system-level data structures used by the kernel to  manage the database
You might think of an RDBMS as an operating system (or set of subsystems), designed  specifically for controlling data access; its primary functions are storing, retrieving, and securing  data. An RDBMS maintains its own list of authorized users and their associated privileges;  manages memory caches and paging; controls locking for concurrent resource usage;  dispatches and schedules user requests; and manages space usage within its table-space  structures.
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The Unix Kernel maintains two key data structures related to processes, the process table and the user structure. Which of following information is not the part of user structure? (A) File descriptor table (B) System call state (C) Scheduling parameters (D) Kernel stack

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Last Answer : (C) Scheduling parameters

One of the disadvantages of user level threads compared to Kernel level threads is (1) If a user level thread of a process executes a system call, all threads in that process are blocked. (2) Scheduling is application dependent. (3) Thread switching doesn’t require kernel mode privileges. (4) The library procedures invoked for thread management in user level threads are local procedures.

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Last Answer :  Crash