# Optimasi Performa (Spring Boot)

> Optimasi performa: profiling, caching, lazy loading, pagination, connection pooling, indexing DB

- 30 pertanyaan wawancara
- Senior
- [Pertanyaan Wawancara: Spring Boot](https://sharpskill.dev/id/technologies/spring-boot/pertanyaan-wawancara.md)

## 1. Apa itu HikariCP dalam konteks Spring Boot?

**Jawaban**

HikariCP adalah manajer connection pool default di Spring Boot sejak versi 2.0. Ia menawarkan performa luar biasa melalui implementasi yang dioptimalkan (overhead rendah, manajemen concurrency yang efisien) dan secara luas dianggap sebagai connection pool tercepat di pasaran. Spring Boot menggunakannya secara otomatis ketika spring-boot-starter-data-jpa atau spring-boot-starter-jdbc ada dalam dependensi.

## 2. Parameter HikariCP mana yang mendefinisikan jumlah maksimum koneksi dalam pool?

**Jawaban**

Parameter maximumPoolSize mendefinisikan jumlah maksimum koneksi (aktif dan idle) yang akan dipertahankan HikariCP dalam pool. Nilai yang direkomendasikan oleh HikariCP umumnya didasarkan pada rumus: connections = ((core_count * 2) + effective_spindle_count), sering kali antara 10 dan 20 untuk aplikasi tipikal. Nilai yang terlalu tinggi dapat membuat basis data jenuh, sementara nilai yang terlalu rendah dapat menyebabkan penantian koneksi.

## 3. Apa perbedaan antara maximumPoolSize dan minimumIdle di HikariCP?

**Jawaban**

maximumPoolSize mendefinisikan jumlah maksimum total koneksi (aktif dan idle) dalam pool, sedangkan minimumIdle mendefinisikan jumlah minimum koneksi idle yang dipertahankan HikariCP secara permanen. HikariCP merekomendasikan untuk tidak mengatur minimumIdle dan membiarkan maximumPoolSize mengelola pool (perilaku default: minimumIdle = maximumPoolSize), karena pool menyesuaikan secara otomatis berdasarkan beban untuk mengoptimalkan performa.

## 27 pertanyaan lagi tersedia

- Apa rumus yang direkomendasikan HikariCP untuk menghitung maximumPoolSize?
- Parameter HikariCP mana yang mengontrol waktu tunggu maksimum untuk memperoleh koneksi dari pool?

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