Tableau Server’s installer configures process instances based on hardware and deployment type (single-node vs. multi-node). For a single-node installation with 4 cores, we need to consider the default process topology. Let’s break this down exhaustively:
Key Processes:
Gateway: Handles incoming requests (1 instance).
Application Server (VizPortal): Manages UI and sessions (1 instance).
VizQL Server: Renders visualizations (2 instances).
Backgrounder: Runs extract refreshes, subscriptions (1 instance).
Data Server: Manages data connections (1 instance).
File Store: Stores extracts (1 instance).
Repository: Metadata database (1 instance, active).
Cluster Controller, Cache Server, etc.: Supporting processes (typically 1 each).
Default Configuration:
On a single-node install, Tableau sets 1 instance per process unless specified otherwise, except for VizQL, which defaults to 2.
The installer doesn’t scale instances linearly with cores (e.g., 4 cores ≠ 4 instances). Post-install, TSM can adjust this (e.g., tsm topology set-process), but the question asks for the installed default.
Minimum hardware (8 cores, 32 GB RAM) suggests higher defaults, but 4 cores still triggers a minimal setup.
Option B (1): Correct with Caveat.
Most processes (e.g., Backgrounder, Gateway, Data Server) default to 1 instance on install, regardless of 4 cores.
VizQL defaults to 2, but the question’s phrasing ("each process") implies a general rule. Historically (and per docs), 1 is the baseline for most, with VizQL as the exception.
Interpretation: Assuming "each" means the typical case, 1 fits most processes on a 4-core single-node setup.
Option A (2): Incorrect. Only VizQL defaults to 2; others don’t.
Option C (8): Incorrect. Far exceeds defaults—8 cores might justify more, but not 4.
Option D (4): Incorrect. Not tied to core count by default; manual config would be needed.
