---
title: "Data Historian vs. Time-Series Database: How to Choose and When to Switch"
description: "Data historian or time-series database? See when to keep your historian, run both in parallel, or replace it—plus how oil and gas teams are deciding today."
section: "Postgres for IoT"
---

> **TimescaleDB is now Tiger Data.**

You have a historian. It works. So why is everyone talking about replacing it?

The short answer: your historian was built for one job, and that job has expanded. Real-time analytics, SQL access for IT teams, ML pipelines, and cloud deployment were not on the requirements list when OSIsoft shipped the first PI System. Now they are.

But "replace your historian with a TSDB" is bad advice for most teams. The answer, for engineers who live in OT environments, is more nuanced: keep your historian, augment it, or replace it depending on where your actual bottleneck sits. This article walks through each path.

A disclosure: Tiger Data makes a time-series database. We have an obvious stake in this comparison. We have also watched enough historian migration projects go sideways to know that recommending full replacement when augmentation would do is a fast way to lose trust. The most common real-world outcome is running historian and TSDB in parallel.

What this article covers:

- A side-by-side comparison of how historians and time-series databases actually differ
- The AVEVA PI market situation in 2024-2026 and what it means for evaluation timing
- When keeping your historian is the right call
- How to run historian and TSDB in parallel (the most common pattern)
- When full replacement makes sense and how to approach the migration
- How oil and gas companies are making this decision today
- Why Tiger Data works for historian-class workloads

If you need a primer on [<u>what data historians are and how they work</u>](https://www.tigerdata.com/learn/what-is-a-data-historian), start there. This article assumes you already understand the historian model and goes straight to the strategic decision.

## Data Historian vs. Time-Series Database: A Side-by-Side Comparison

Engineers evaluating platforms want the comparison matrix before the narrative.

| **Dimension** | **Data Historian** | **Time-Series Database (Tiger Data)** |
| --- | --- | --- |
| **Primary design purpose** | OT data collection, process monitoring, operator visualization | Analytics, SQL access, IT integration, scale |
| **Data model** | Tag-based (tag name + timestamp + value + quality code) | Relational tables with time columns; flexible schema |
| **Query language** | Proprietary (PI AF/SDK, AspenOne, OSIsoft AF) | Standard SQL (PostgreSQL-compatible) |
| **OT protocol support** | Native OPC-DA, OPC-UA, Modbus, proprietary DCS connectors | Requires connector layer (Ignition, Telegraf, MQTT bridge) |
| **Compression** | Exception reporting + swinging door (optimized for step-function signals) | Columnar compression via Hypercore (90-98% storage savings) |
| **Analytics capabilities** | Built-in trending; limited aggregation; no window functions | Full SQL: window functions, continuous aggregates, joins |
| **Scalability ceiling** | Per-tag licensing becomes expensive at IIoT scale (100K+ tags) | Usage-based; no per-tag fees; horizontal scaling |
| **BI tool access** | Proprietary APIs; limited native connectors | Grafana, Tableau, dbt, Superset, Jupyter via standard Postgres |
| **Deployment options** | On-premises primary; cloud versions are add-ons | Managed cloud (Tiger Cloud on AWS and Azure); self-hosted |
| **Licensing model** | Per-tag or per-server; enterprise pricing | Usage-based (compute + storage) |
| **Compliance features** | FDA 21 CFR Part 11 audit trails, OPC quality codes, batch records | ACID compliance, custom audit tables; no native quality codes |

These tools were designed for different problems by different teams. Historians came out of OT engineering departments in the 1980s and 1990s, optimized for plant floor control and compliance. Time-series databases came out of software engineering teams building cloud-native analytics. Both design constraints are still visible in the products today.

This creates a recurring organizational dynamic that community research in r/industrialautomation and r/SCADA consistently surfaces: OT technicians prefer historian GUIs; IT engineers want SQL and standard BI connectors. That tension is often the real reason the historian vs. TSDB decision is administrative, not just technical.

### Where Historians Still Win

**Native OT protocol support.** Historians connect directly to PLCs, DCS systems, and SCADA via OPC-DA, OPC-UA, Modbus, and proprietary protocols out of the box. No middleware, no connector layer to maintain. For environments with hundreds of legacy PLCs, that native connectivity is not a minor convenience.

**Quality codes as a first-class data type.** Historians store OPC quality codes (Good, Bad, Uncertain) alongside values at the storage layer. Not a custom field - a native data model. For pharmaceutical manufacturing, FDA 21 CFR Part 11 compliance, and any environment where data quality provenance is a regulatory requirement, this infrastructure is historian-native and requires significant custom work to replicate elsewhere.

**Compression designed for industrial signals.** Exception reporting and swinging door compression are designed specifically for the sparse, step-function patterns that industrial sensors produce - signals that change infrequently and hold steady for long periods. Modern columnar compression (like Hypercore) is excellent for dense, high-frequency sensor data but represents a different tradeoff.

**Operator-facing tooling.** PI ProcessBook (now end-of-life), PI Vision, AspenTech IP21 Process Explorer, and AVEVA Trend were built for control room operators who are not SQL engineers. These tools have decades of embedded workflow optimization for plant floor use cases.

**Regulatory compliance.** FDA 21 CFR Part 11 audit trails, ISA-88 batch records, and change logs are historian-native. Building equivalent compliance infrastructure on a general-purpose time-series database requires custom development and validation work.

### Where Time-Series Databases Win

**SQL and open ecosystem.** Full ANSI SQL means Grafana, Jupyter, dbt, Apache Superset, Tableau, and any other BI or analytics tool connects without a custom connector. Historian data is typically locked behind proprietary APIs that IT teams cannot access without specialized knowledge.

**Scale without per-tag licensing.** TSDBs scale to billions of rows with no per-tag constraints. At 500,000 IoT sensor tags, historian per-tag licensing becomes a finance conversation. Usage-based TSDB pricing scales with actual storage and compute consumed, not the number of sensors on the plant floor.

**Analytics and ML readiness.** Window functions, aggregations, continuous aggregates for pre-computed rollups, and the full PostgreSQL ecosystem, including pgvector for ML feature stores, are available natively. Historians are not designed for these workflows and typically require data export pipelines to feed analytics systems.

**Managed cloud deployment.** Tiger Cloud runs on AWS and Azure with automatic backups, scaling, and SOC 2 Type II compliance. For oil and gas operators managing remote well sites, managed cloud is often the only viable path. Traditional historians are on-premises by design; cloud versions (PI Cloud Connect, AVEVA Connect) are add-ons rather than native architectures.

**Developer ergonomics.** Engineers who know PostgreSQL can be productive in Tiger Data immediately. Historian query languages (PI AF, OSIsoft AF SDK, AspenOne) have steep learning curves and are not transferable outside the OT ecosystem.

For more on what makes time-series databases different from general-purpose databases, see [<u>our time-series database fundamentals guide</u>](https://www.tigerdata.com/learn/time-series-database-what-it-is-how-it-works-and-when-you-need-one).

## The AVEVA PI Reality Check

Three things have happened in the market from 2023 to 2026 that changed the evaluation calculus.

**Schneider Electric acquisition (2023).** AVEVA was acquired by Schneider Electric in 2023. For engineers in PI-heavy shops, the acquisition put the AVEVA product roadmap under scrutiny. Acquisitions of OT software companies by industrial conglomerates have historically led to product consolidation, price increases, and reduced R&D investment in non-strategic products. PI System is AVEVA's crown jewel, so the direct risk to PI itself is lower than to adjacent products, but the organizational uncertainty is real.

**ProcessBook end-of-life (December 2024).** AVEVA PI System's primary visualization tool, ProcessBook, reached end-of-life in December 2024. PI customers were directed to migrate to PI Vision. For many organizations, this was the first forced migration in a decade. It put the broader PI System roadmap under scrutiny and created an organizational moment to ask: if we are already migrating our visualization layer, should we evaluate the historian itself?

**GE Proficy PE sale (March 2026).** GE Proficy, the product line that includes iFIX and GE Historian, was sold to TPG private equity in March 2026. For Proficy Historian customers, this introduces roadmap uncertainty comparable to what PI users experienced during the Schneider acquisition. Private equity ownership of industrial software typically means cost optimization and efficiency focus ahead of eventual resale, not investment in new capabilities.

None of this means PI is going away. AVEVA PI remains the market leader in process industries and is deeply embedded in operations across oil and gas, utilities, and manufacturing. But the combination of these three events has opened an evaluation window that did not exist three years ago. For engineers already managing a migration from ProcessBook to PI Vision, the question "should we evaluate the historian while we are at it?" is now commercially and organizationally rational. The migration friction already exists.

TDengine has noticed the same window. They have launched a dedicated "PI System alternative" landing page with direct pricing comparisons. Tiger Data is not the only company positioning against PI for the analytics layer.

## When to Keep Your Historian

Keep your historian if the following conditions apply.

**Your organization operates under FDA 21 CFR Part 11 or similar regulatory audit trail requirements.** A time-series database does not provide a drop-in replacement for historian quality code infrastructure without substantial custom development and regulatory validation work. If your process historian is part of your validated system documentation, the migration cost is not just technical.

**Your OT team owns the data platform and is deeply integrated with historian-native tooling.** If process engineers rely on PI Vision, AspenTech IP21 Process Explorer, or AVEVA Trend for daily operations, alarm management, and operator HMI, and if your IT team does not have pressing SQL access requirements, organizational change management will likely cost more than any licensing savings.

**Your tag count is under roughly 50,000 and per-tag licensing is not a budget concern.** At that scale, the migration risk and dual-system transition cost may not be justified. The per-tag licensing math only gets painful at higher volumes.

**Your primary use case is real-time process monitoring and control, not analytics or reporting.** If your bottleneck is not data access or analytics performance (if the historian is simply storing and trending process data for operators) a TSDB adds complexity without adding proportionate value.

**You have safety-critical applications where historian availability is a process safety requirement.** In environments where historian data feeds safety system decisions or alarm management, the availability and reliability track record of a production historian system is an argument for keeping it, not replacing it.

For many OT-primary organizations, the historian is doing its job. The TSDB case is strongest when your bottleneck is data access, analytics performance, scale, or IT integration - not data collection.

## When to Augment: Running Historian and TSDB in Parallel

Most engineers evaluating this question will end up here.

The hybrid architecture looks like this: the historian handles data collection from OT systems via OPC-UA, MQTT, and Modbus: the real-time operations layer, compression, quality code storage, and compliance. The TSDB receives a parallel stream of the same data for analytics, IT reporting, ML pipelines, and SQL access. Data does not flow in reverse. The historian remains the system of record for OT data; the TSDB serves the analytics layer.

**The data flow:** PLC or DCS sends data to SCADA, which feeds the historian for real-time operations and compliance. A connector or ETL layer (MQTT bridge, Ignition SQL Historian, Telegraf) forwards the same data to Tiger Data for the analytics layer.

**Ignition SCADA.** Inductive Automation's Ignition platform is a major integration path here. [<u>Ignition's SQL Historian module writes tag history directly to PostgreSQL</u>](https://www.tigerdata.com/blog/ignition-and-timescaledb-perfect-pairing), making Tiger Data a native Ignition database target. Engineers already running Ignition can point the SQL Historian at Tiger Data without replacing their historian or building a custom connector.

**MQTT bridge pattern.** Many modern IIoT deployments use an MQTT broker (HiveMQ, EMQX, Chariot MQTT) as a fanout layer, publishing sensor data simultaneously to the historian via OPC-UA and to the TSDB via a direct connector. WaterBridge uses exactly this architecture: Ignition SCADA feeds both the operational layer and Tiger Data for analytics, with Chariot MQTT Servers as the message layer.

**When does the augmentation path make sense?**

- Your IT team needs SQL access to OT data for analytics, reporting, or ML workflows, but your OT team is not ready to move off historian tooling
- You are adding new IIoT sensors that would trigger expensive per-tag license increases on the historian
- Your historian vendor roadmap is uncertain and you want to build optionality without a full migration
- You use Ignition SCADA and want Tiger Data as a native SQL Historian target
- You need Grafana, dbt, Tableau, or standard BI tooling connected to process data

**The real cost.** Running two systems has real costs: storage duplication, connector maintenance, and two query interfaces to keep engineers trained on. The augmentation path makes sense when the analytics value exceeds those operational costs, which is typically true when: data volumes are growing beyond historian license tiers, IT teams need SQL access to OT data, or ML and AI workflows require bulk data access that the historian struggles to serve efficiently.

## When to Replace: Migrating Off a Legacy Historian

Full replacement is the right path in specific circumstances. It is not a universal recommendation.

**Replace your historian when:**

- You are starting a greenfield IIoT deployment without legacy OT infrastructure - the historian connectivity advantages do not apply if you are starting from scratch
- Your historian is out of vendor support or you have decided to exit the platform (relevant for GE Proficy customers post-PE sale, or PI customers who have already evaluated the full migration cost)
- Per-tag licensing is prohibitive at your current or projected scale - a 500-well Permian Basin operator with 200 sensors per well has 100,000 tags, which is expensive territory for per-tag historian pricing
- Your primary use case is IT-side analytics and ML rather than real-time process control, and your OT data collection can be handled by modern lightweight agents (Telegraf, Vector, MQTT clients)
- Your team is SQL-native and historian query languages are a persistent productivity bottleneck

**Do not recommend full replacement** for organizations with deep OT infrastructure, safety-critical process control systems, or active regulatory compliance requirements without acknowledging the transition cost. The technical migration is often easier than the organizational alignment required.

**Migration path:**

- Inventory your historian tags, data types, and retention requirements. Know what you are migrating before you start.
- Set up a parallel Tiger Data instance and validate ingestion through your existing OT connectors or an MQTT bridge. Run both systems simultaneously against live data.
- Run both systems in parallel for a defined period, typically 30 to 90 days, to validate data fidelity against the historian.
- Migrate analytics tooling and reporting dashboards (Grafana, Spotfire, PowerBI) to query Tiger Data. Keep the historian running until IT-side stakeholders have signed off on the new stack.
- Decommission the historian after joint sign-off from both OT and IT teams.

The decommissioning step is typically the hardest. Not the technical migration, but getting OT and IT teams, who have different risk tolerances and different definitions of "good enough", to agree that the migration is complete.

**Tiger Data is a strong fit for historian migration if:**

- Your use case is analytics-primary (predictive maintenance, anomaly detection, production optimization)
- You need SQL access to process data for IT teams and standard BI tooling
- Your tag count has grown beyond the economic range of per-tag licensing
- Your existing historian is out of support or on an uncertain roadmap
- Your team is already on PostgreSQL elsewhere in your stack

## How Oil and Gas Companies Are Making This Decision

Oil and gas presents a specific set of requirements that stress both historians and generic TSDBs: high-frequency wellhead telemetry, produced water management, pipeline SCADA, and remote or disconnected edge deployments.

**WaterBridge (Permian Basin, produced water management).** WaterBridge manages produced water logistics across the Permian Basin. Their system [<u>ingests up to 10,000 data points per second</u>](https://www.tigerdata.com/blog/how-waterbridge-uses-timescaledb-for-real-time-data-consistency) from wellhead sensors, connecting via Ignition SCADA and Chariot MQTT Servers. They use Tiger Data for real-time data consistency, with PowerBI, Seeq, and Spotfire for visualization and anomaly reporting. A live production deployment, and a textbook hybrid architecture: Ignition handles the SCADA layer; Tiger Data handles analytics and reporting.

**Flogistix (gas compression optimization).** Flogistix, now Flogistix by Flowco, runs gas compression monitoring across upstream oil and gas: a high-frequency, edge-deployed use case. They reduced infrastructure management costs by 66% after moving to Tiger Data, with 84% compression on historical data and uptime improving from a previous baseline to 99%-plus. For more on their deployment, see [<u>How Flogistix by Flowco Reduced Infrastructure Management Costs by 66%</u>](https://www.tigerdata.com/blog/how-flogistix-by-flowco-reduced-infrastructure-management-costs-by-66-with-tiger-data).

**Mechademy (predictive maintenance on industrial equipment).** Mechademy uses Tiger Data for predictive maintenance on industrial assets, a use case where historian data is valuable but often inaccessible to ML pipelines without a TSDB layer sitting between the historian and the model.

**Oil and gas-specific decision factors:**

- **Edge deployment.** Remote well sites often cannot maintain persistent cloud connectivity. Historians handle disconnected operation well; TSDBs increasingly support edge modes, but the maturity gap is real at truly disconnected edges.
- **Regulatory reporting.** EPA and state-level produced water tracking requirements create compliance obligations that may benefit from historian-style audit trail infrastructure.
- **Tag count economics.** A 500-well Permian Basin operator with 200 sensors per well has 100,000 tags. Per-tag historian pricing at that scale is a serious annual line item. Usage-based TSDB pricing changes the math.

For broader context on this space, see [<u>how real-time analytics in oil and gas prevents production losses</u>](https://www.tigerdata.com/blog/how-real-time-analytics-in-oil-gas-prevents-millions-in-losses-unlocks-efficiency) and [<u>IIoT energy data engineering solutions beyond legacy historians</u>](https://www.tigerdata.com/blog/iot-energy-data-at-scale-engineering-solutions-beyond-legacy-historians).

The dominant pattern in this evaluation is not full replacement. Most oil and gas operators run hybrid architectures: historian at the SCADA layer, Tiger Data at the analytics and reporting layer. WaterBridge is a concrete example of that pattern in production.

## Why Tiger Data Works for Historian-Class Workloads

**PostgreSQL foundation.** Tiger Data extends PostgreSQL, not replaces it. SQL-native, ACID-compliant, with decades of production reliability. Every engineer who knows Postgres is immediately productive. The entire BI and analytics ecosystem (Grafana, dbt, Tableau, Apache Superset, Jupyter) connects via standard Postgres drivers, no custom connectors required.

**Hypertables.** TimescaleDB's hypertable is a PostgreSQL table with automatic time-based partitioning built in. Queries stay bounded as data volumes grow into billions of rows because each query only scans the relevant time chunks, not the entire table. For historian-scale workloads, this means a 10-year archive of wellhead telemetry at one-second resolution is a query Tiger Data handles without workarounds. No manual partition management required. For more, see the [<u>hypertable documentation</u>](https://www.tigerdata.com/docs/learn/hypertables/optimize-data-in-hypertables).

**Hypercore columnar engine.** Hypercore is Tiger Data's hybrid row-columnar storage engine. New data lands in the rowstore for fast writes, then automatically converts to the columnstore where analytical queries read fewer bytes and run faster. Compression reaches 90-98% on time-series data, which directly reduces the storage costs that per-tag historian licensing exacerbates. For an operator moving from historian per-tag pricing to usage-based TSDB storage, that compression ratio changes the cost model significantly. See the [<u>Hypercore documentation</u>](https://www.tigerdata.com/docs/learn/columnar-storage/understand-hypercore) for how it works.

**Continuous aggregates.** Continuous aggregates are incrementally maintained materialized views that update automatically in the background. They are the TSDB equivalent of a historian's built-in downsampling - pre-computed rollups of 1-minute or 1-hour averages that Grafana dashboards can query without hitting billions of raw rows. Essential for dashboard performance at historian scale. See the [<u>continuous aggregates documentation</u>](https://www.tigerdata.com/docs/learn/continuous-aggregates).

**No per-tag licensing.** Tiger Cloud is usage-based - compute plus storage. There is no per-sensor or per-tag fee. An operator adding 100,000 new IIoT sensors pays for the resulting storage and query load, not a per-tag license multiplied by 100,000. At scale, the licensing model is the biggest cost difference between historians and TSDBs.

**Tiger Cloud managed service.** Tiger Cloud is fully managed on AWS and Azure with automatic backups, scaling, and SOC 2 Type II compliance. For oil and gas operators who cannot maintain on-premises infrastructure at remote well sites, managed cloud changes what is operationally viable.

For IIoT deployment patterns, see the [<u>industrial IoT use case section</u>](https://www.tigerdata.com/industrial-iot).

**Limitations to acknowledge.** Tiger Data does not have native OPC-DA or OPC-UA connectors built in. You need a connector layer - Ignition, Telegraf, a custom MQTT bridge - to get data from OT devices into Tiger Data. Tiger Data does not provide historian-equivalent OPC quality codes as a native data type. For pure OT data collection from legacy PLCs, a traditional historian still has the simpler integration path. That is why the hybrid architecture is the most common real-world pattern, not full replacement.

### Tiger Data vs. Other TSDB Options for This Use Case

**InfluxDB.** InfluxDB has gone through three distinct query language versions: InfluxQL in 1.x, Flux in 2.x, and SQL in 3.0, with Cloud Serverless and Cloud Dedicated as separate offerings. For industrial teams building long-term data infrastructure, query language instability is a real operational risk. PostgreSQL SQL is a decades-old standard with no version fragmentation. InfluxDB's "extend don't replace" positioning with Telegraf integrations is practical, but the version trajectory warrants evaluation. The United Manufacturing Hub team [<u>wrote about their choice of TimescaleDB over InfluxDB</u>](https://www.tigerdata.com/blog/how-united-manufacturing-hub-is-introducing-open-source-to-manufacturing-and-using-time-series-data-for-predictive-maintenance) specifically because of the SQL stability argument.

**TDengine.** TDengine is a new entrant positioning directly as a "PI System alternative." It has credible OT protocol support and is technically serious. It uses a proprietary TDengine SQL dialect rather than standard PostgreSQL SQL. Smaller community and ecosystem than PostgreSQL. Worth evaluating if direct OPC-UA-native ingestion is your primary requirement.

**QuestDB.** Strong raw ingestion performance, growing community, SQL-native. Less mature managed service than Tiger Cloud; smaller ecosystem than Tiger Data. Worth evaluating for performance-critical ingestion use cases.

All comparative claims here are directional. We recommend evaluating these options against your specific workload rather than relying on any vendor comparison.

## Decision Framework: Keep, Augment, or Replace

Use this for internal justification.

### Keep your historian if:

- Your organization operates under FDA 21 CFR Part 11 or similar regulatory audit trail requirements
- Your OT team owns the data platform and is deeply integrated with historian-native tooling (ProcessBook, PI Vision, AspenTech IP21)
- Your tag count is under roughly 50,000 and per-tag licensing is not a budget concern
- Your primary use case is real-time control system monitoring, not analytics or reporting
- You have safety-critical applications where historian availability is a process safety requirement

### Add Tiger Data alongside your historian if:

- Your IT team needs SQL access to OT data for analytics, reporting, or ML and AI workflows
- Your historian vendor roadmap is uncertain (AVEVA PI post-Schneider, GE Proficy post-TPG) and you want to build optionality
- You are adding new IIoT sensors that would trigger expensive per-tag license increases
- You use Ignition SCADA and want Tiger Data as a native SQL Historian target
- You need Grafana, dbt, Tableau, or standard BI tooling connected to process data

### Replace your historian with Tiger Data if:

- You are building a greenfield IIoT deployment without legacy OT infrastructure
- Your use case is analytics-primary (predictive maintenance, anomaly detection, production optimization) rather than real-time control
- Your historian is out of vendor support or you have decided to exit the platform
- Your tag count has grown or is projected to grow beyond the economic range of per-tag licensing
- Your team is SQL-native and historian query languages (AF SDK, InfluxQL) are a productivity bottleneck

## FAQ: Data Historian vs. Time-Series Database

### Can a time-series database replace a data historian?

Yes for some use cases, no for others - and running both in parallel is the most common real-world answer. TSDBs excel at analytics, SQL access, and open ecosystem integration. Historians still lead for OT protocol connectivity, quality code compliance, and operator-facing visualization. For organizations with legacy OT infrastructure, a parallel deployment is typically lower risk than full replacement.

### What is the best alternative to AVEVA PI?

It depends on what you are replacing PI for. For the analytics and IT-side data access layer: Tiger Data provides PostgreSQL-native SQL, no per-tag licensing, and managed cloud deployment on AWS and Azure. For a full PI System replacement including OT data collection: you need a connector layer (Ignition, Telegraf, or OPC-UA middleware) alongside any TSDB. TDengine is a direct PI System alternative positioning with OT-native claims worth evaluating. AVEVA PI remains the market leader for OT-native historian deployments.

### Is AVEVA PI still worth investing in?

PI System is deeply embedded in process industries and is not going away. However, the combination of Schneider Electric's ownership (2023), ProcessBook end-of-life (December 2024), and competitive pressure from open-source alternatives is prompting many organizations to evaluate their PI dependency for new deployments. The answer depends on your regulatory requirements, tag count economics, and whether your analytics team needs SQL access to process data.

### What happened to AVEVA ProcessBook?

AVEVA ProcessBook, the primary PI System visualization tool for decades, reached end-of-life in December 2024. AVEVA directed customers to migrate to PI Vision. For many organizations, this was the first forced PI migration in years and created an evaluation window for the broader PI System platform.

### How do I migrate from a data historian to a time-series database?

- Inventory your tags, data types, and retention requirements.
- Set up a parallel Tiger Data instance and validate ingestion.
- Run both systems in parallel for 30 to 90 days to validate data fidelity.
- Migrate analytics tooling and reporting dashboards.
- Decommission the historian after joint sign-off from both OT and IT teams.

The technical migration is typically less difficult than the organizational alignment required.

### What is the difference between a historian and a SCADA system?

A SCADA (Supervisory Control and Data Acquisition) system handles real-time monitoring and control of industrial processes. A historian is the long-term storage layer for SCADA data - it receives a stream of tag values from the SCADA system and stores them for trending, reporting, and compliance. The historian is a component of, or adjacent to, the SCADA architecture. Tiger Data can serve as the analytics layer on top of a SCADA plus historian stack.

### What does OPC-UA have to do with data historians?

OPC-UA (Unified Architecture) is the dominant standard protocol for industrial device communication, the interface through which historians collect data from PLCs, DCS, and SCADA systems. Historians are built with native OPC-UA clients. Tiger Data does not have a native OPC-UA client. You need a connector layer (Ignition, Telegraf, or a custom OPC-UA adapter) to bridge OPC-UA devices to Tiger Data. This is the primary technical reason the "run both in parallel" architecture is common: the historian continues handling OPC-UA collection; Tiger Data receives the data via MQTT or a direct connector.

### Are data historians going away?

No, not in the near term. Historians are deeply embedded in process industries across oil and gas, pharmaceuticals, utilities, and manufacturing. The market is consolidating - the AVEVA acquisition, the GE Proficy PE sale - and open-source alternatives are growing, but historians are not being replaced at scale. The more accurate trend is that organizations are adding TSDBs alongside historians for analytics workloads rather than replacing historians outright.

### How does Tiger Data compare to OSIsoft PI?

PI is the industry standard for OT data collection, quality code compliance, and operator-facing visualization - it is deeply integrated into plant operations. Tiger Data is a PostgreSQL-based time-series database optimized for analytics, SQL access, and cloud deployment. The tools serve different primary use cases. Where Tiger Data competes most directly with PI is in new deployments - especially IIoT and remote asset monitoring - where per-tag licensing is prohibitive and the primary need is analytics rather than process control. We recommend evaluating both based on your specific OT and IT requirements.

### What is the best database for oil and gas SCADA data?

For real-time SCADA data collection, a historian (AVEVA PI, GE Proficy, Inductive Automation Ignition SQL Historian) is typically the right layer - native OPC-UA support and operator tooling are difficult to replace. For the analytics, reporting, and ML layer built on top of SCADA data, Tiger Data provides PostgreSQL-native SQL, continuous aggregates, and no per-tag pricing. That is why operators like WaterBridge (Permian Basin, [<u>up to 10,000 data points per second</u>](https://www.tigerdata.com/blog/how-waterbridge-uses-timescaledb-for-real-time-data-consistency)) use Tiger Data for produced water monitoring and alerting. The most common architecture is SCADA plus historian for collection, Tiger Data for analytics.

### What is the best managed database for oil and gas companies replacing AVEVA PI?

For organizations evaluating a move away from AVEVA PI, the answer depends on what PI functions you are replacing. For the data collection layer (OPC-UA, PLC connectivity): you need a connector like Ignition or Telegraf alongside any TSDB. For the analytics and IT integration layer: Tiger Cloud provides fully managed PostgreSQL on AWS and Azure, usage-based pricing without per-tag fees, and native SQL. Tiger Data customers in oil and gas include WaterBridge (produced water, Permian Basin) and Flogistix by Flowco (gas compression). For organizations that need OT-native historian functionality plus open analytics, a parallel deployment - PI for OT collection, Tiger Data for analytics - is the lower-risk transition path.

### How does TimescaleDB compare to InfluxDB for industrial historian workloads?

InfluxDB's query language history - InfluxQL in 1.x, Flux in 2.x, SQL in 3.0 - is a known pain point for industrial teams building long-term data infrastructure. TimescaleDB (the open-source project behind Tiger Data) uses PostgreSQL's SQL, a standard with no version fragmentation risk. For IIoT teams that need SQL access to historian-scale data, Tiger Data's PostgreSQL foundation provides more stable tooling than InfluxDB's evolving query language stack. A directional claim based on the publicly documented query language evolution; we recommend benchmarking against your specific workload.

*Ready to see how Tiger Data handles historian-scale data? *[*<u>Start a Tiger Cloud trial</u>*](https://www.tigerdata.com/cloud)*, learn more about *[*TimescaleDB Enterprise*](https://www.tigerdata.com/timescaledb-enterprise)* or *[*<u>explore IIoT use cases</u>*](https://www.tigerdata.com/industrial-iot)*.*