Why is understanding the internal behavior of PL/pgSQL functions important when optimizing database performance?

hard📝 Conceptual Q10 of 15

PostgreSQL - Advanced PL/pgSQL

ABecause PL/pgSQL functions are cached and compiled, affecting execution speed

BBecause PL/pgSQL functions automatically create indexes

CBecause PL/pgSQL functions replace the query planner

DBecause PL/pgSQL functions do not support transactions

Step-by-Step Solution

Solution:

Step 1: Recall PL/pgSQL function execution model
PL/pgSQL functions are parsed, planned, and cached, which impacts how fast they run on repeated calls.
Step 2: Understand optimization impact
Knowing this helps write efficient functions that minimize recompilation and maximize reuse.
Final Answer:
Because PL/pgSQL functions are cached and compiled, affecting execution speed -> Option A
Quick Check:
Function caching affects performance optimization [OK]

Quick Trick: Function caching improves repeated execution speed [OK]

Common Mistakes:

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