Data integration: what it is and how to unify data between systems without duplicating it

3/2/2026

Development
Product

If your eCommerce, ERP, CRM and marketing tools don't share the same “truth”, you're going to feel it everywhere: reports that don't close, duplicate customers, outdated inventories, and teams discussing which system is “right”.

When data is spread over so many spaces, it is normal for silos, inconsistencies and repeated records to appear. La data integration, exists precisely to avoid such chaos, by combine and harmonize data from multiple sources in a consistent and usable format.

What is data integration (and what it is NOT)

Google Cloud He sums it up like this: data integration is bringing together data from different sources to obtain a unified and more valuable view, allowing us to decide better and faster.

In practice, this usually attacks very specific problems:

  • Silos and redundancies: integrating seeks to unify access and reduce inconsistencies.

  • Data in multiple formats and locations: integration transforms and structures so that it is usable.

  • Speed and efficiency: integration can automate processes and reduce manual work.

In data environments (and especially customer data), Bounteous warns that without unification, information remains fragmented, making it difficult to extract insights and deliver personalized experiences.

Microsoft Azure, meanwhile, defines data integration Like the process for combine data from multiple sources and give users/areas a unified view.

  • It's not just “ingesting”: IBM Clarify that the integration goes beyond ingestion and goes all the way to analytical/operational use (includes responsibilities for results).

  • It is an umbrella of techniques: ETL/ELT, replication, virtualization, CDC, streaming, etc.

In practice, Integrating data involves identify sources, extract, map, validate/quality, transform (cleaning/standardization), load and synchronize, in addition to governance/security.

So... what is “data unification” and why does it matter to “not duplicate”?

La data unification focuses on build a unique and reliable view from different sources and different attributes. And, key to your title: include identify and merge duplicates (for example, “Juan Pérez” in CRM, “J. Perez” in eCommerce, “JPérez” in support).

Reltio describes it as a broader process: cleaning/normalizing, creating unique identifiers, detect and merge duplicates in trusted entities. In addition, it warns that when data is spread across platforms, inconsistencies, errors and duplication increase.

Why data is duplicated (even if you “integrate”)

There are three typical causes:

  1. Multiple systems keep the same thing with different rules (formats, names, keys).

  2. “Copy and paste” integrations (ungoverned replication), which create parallel versions.

  3. Architectural decisions: Google Cloud mentions the trade-off between move/duplicate data vs. distributed approaches.

The realistic goal isn't “zero copies” in any scenario; it's avoid unnecessary duplication and, when there are copies per performance/operation, that they are controlled and consistent.

Common methods for integrating

There are several typical integration methods: ETL, ELT, data virtualization, CDC, integration via APIs.

As strategies, we can also mention the replication, virtualization, change data capture, streaming, in addition to ETL/ELT.

ETL vs. ELT (when it matters for your architecture)

  • ETL: extract, transform, load.

  • ELT: extract, load, transform; Azure presents it as an alternative that “pushes” processing towards data to improve performance.

Rivery It also defines ETL and ELT, noting that in ELT the transformation occurs subsequently of loading raw data to the destination.

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Virtualization and Federation: The Direct Way to “Unify Without Duplicating”

If your priority is avoid duplication by design, there are two concepts that appear strongly in the sources:

  • Data Virtualization: Create a virtual layer to provide a unified view without physically moving the data

  • Federated integration: IBM indicates that the data remains in the source systems and the queries are executed in real time; and clarifies the tradeoff: Reduce duplication, but it may have performance challenges.

In simple terms: if you don't need to persist everything in a central repository, virtualization/federation may be the most direct path to unifying “without cloning”.

CDC (Change Data Capture) and streaming: when freshness rules

Google Cloud describes CDC how to capture changes at the source and replicate them to the destination in real or near real time. IBM also mentions CDC as a form of real-time integration, applying source updates to data warehouses or other repositories

3 strategies for “unifying without duplicating” (or doubling the minimum)

1) Data Virtualization (unified view without physically moving)

According to IBM: create a virtual layer to query integrated data “on demand”, without physical movement. Microsoft Azure Also ready Data Virtualization as an integration strategy.

When is it good for: operational reports, need for agility, access in near real time.

2) Federated integration (the data remains at the source)

In the federation, the data they remain in their systems and queries are cross-executed in real time; it reduces duplication, but it can have performance challenges.

When is it good for: when you don't want (or can't) centralize; analysis with scattered sources.

3) Unification with entity resolution (deduce “intelligent”)

Essential part is Resolve duplicates and merging them into trusted entities; and its “step by step” includes cleaning/standardization and merging redundant entries.

When is it good for: single customer, single product, single supplier; avoid “three versions of it”.

How to unify data across systems “without duplicating it”

1) Unify by query (without moving data)

Aim at virtualization or Federation to achieve a unified view without replication.

2) Unify with consolidation (but controlling duplicates)

If you need to consolidate into a destination (warehouse/lake), “non-duplication” becomes a problem of quality and resolution of entities. Reltio describes that unification includes create unique identifiers and merge duplicates in trusted entities.

3) Unify to activate experiences (marketing, service, channels)

Bounteous states that without unification, customer data is fragmented and it becomes difficult to extract insights and personalize experiences; this is why it mentions the use of tools such as CDPs, MDM and CRMs as part of the unification ecosystem.

Signs You Need This “Yesterday”

  • It takes you weeks to put together a “simple” report because the data is in silos.

  • There are inconsistences/duplication and no one trusts the numbers.

  • You're integrating by hand (Excel + export/import) and that involves errors and repetitive work.

  • You estimate long times: Google Cloud points out that integrating business sources can take months (mention a typical case of 6 months).

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How Weavee lands it in practice

This is where theory becomes operation.

Universal Connection: integrating systems with a central “hub”

With the Weavee Universal Connection, a Central hub to connect systems (ERP, CRM, eCommerce, etc.) and centralize information eliminating manual processes. It also includes real-time monitoring, with alerts to keep the operation under control.

What do you gain from this, in business language?

  • Less friction between teams because you work with a more coherent view (just what integration/unification seeks).

  • Less unnecessary duplication if you design your flows with synchronization/CDC, virtualization or federation when applicable.

Integrating data is combining and harmonizing sources for operational/analytical use. Unifying data adds a critical layer: resolve duplicates and build trustworthy entities.

If you want it to really work, define your unified view, establish quality/redupe rules and choose the strategy (virtualization, federation, ETL/ELT/CDC) as appropriate.

Ask for a test and we put together an integration/unification plan aligned with your operation.

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