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 thedefault 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 sets1 instance per processunless 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 theinstalled 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.
Why This Matters: Understanding defaults aids capacity planning-4 cores is below production minimum (8), so performance tuning may be needed post-install.