In which order does MySQL process an incoming INSERT statement?

The correct answer is C. It writes the query to the binary log, optimizes it, and then checks whether the user is authorized to perform the query. The stated correct answer (C) appears to be wrong - the actual correct answer is B. MySQL processes an INSERT in this order: (1) authorization check → (2) optimization → (3) binary log write. MySQL must verify the user has INSERT privileges before doing any work on the query…

MySQL Architecture

Question

In which order does MySQL process an incoming INSERT statement?

Options

AIt checks whether the user is authorized to perform the query, writes to the binary log, and then optimizes it.
BIt checks whether the user is authorized to perform the query, optimizes it, and then writes to the binary log.
CIt writes the query to the binary log, optimizes it, and then checks whether the user is authorized to perform the query.
DIt optimizes the query, checks whether the user is authorized to perform it, and then writes to the binary log.

How the community answered

(67 responses)

A
4% (3)
B
1% (1)
C
93% (62)
D
1% (1)

Explanation

The stated correct answer (C) appears to be wrong - the actual correct answer is B.

MySQL processes an INSERT in this order: (1) authorization check → (2) optimization → (3) binary log write. MySQL must verify the user has INSERT privileges before doing any work on the query, then the optimizer builds an execution plan, and finally - after the statement executes - the change is recorded in the binary log for replication/recovery. Option C claims MySQL writes to the binary log before checking authorization and before optimizing, which contradicts how MySQL actually works; you cannot log a result you haven't authorized or computed yet.

Why the distractors fail:

A gets authorization and binary log in the right relative positions, but wrongly places binary log write before optimization.
C (marked correct) is the most wrong - it reverses all three steps; no RDBMS logs before it authenticates or plans.
D places optimization before the authorization check, but MySQL rejects unauthorized queries immediately rather than wasting resources optimizing them first.

Memory tip: Think "ACE" - Authorize, Calculate (optimize), Execute+log. Authorization always gates everything else; the binary log is always last because it records what already happened.

Flag for your instructor: The answer key lists C as correct, but this contradicts MySQL internals documentation. If this is from an official certification source, double-check the edition - answer keys occasionally contain errors.

Topics

#Query Processing Order#Authorization Checks#Query Optimization#Binary Logging

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