Taking over a well-established BI system is a discipline different from building a new system from scratch. Because in addition to the technical infrastructure, the business rules, user habits, and hidden operational dependencies that have developed over the years are also inherited.
The goal of the first 30 days is not to immediately change the system; it is first to understand, make critical risks visible, and create a controlled takeover plan.
1. Build the Technical Inventory
Data sources, databases, ETL packages, SQL Agent jobs, SSAS models, Power BI datasets and reports, gateways, user groups, and service accounts should all appear in a single list.
2. Map Data Flows and Dependencies
Which source feeds which ETL process? Which table is used in which semantic model? When a job fails, which reports are affected? Without the answer to these questions, it is difficult to make safe changes to the system.
3. Identify Critical Business Rules
KPI calculations, special matching rules, date comparisons, branch/product coding logic, and exceptions must be documented. Viewing the technical code is not the same as understanding the business rule.
4. Review Refresh and Operational Flows
When do the daily data come in? When does ETL start? When does SSAS process? How does the Power BI refresh work? The maximum working times for critical jobs and procedures to be followed in case of errors should be clear.
5. Measure Performance and Resource Risks
Long interrogations, high RAM consumption, growing models, unnecessary partition structures, or job failures that frequently generate errors should be included in the priority risk list after takeover.
6. Review Security and Access Controls
The RLS rules, user/group access, service accounts, and processes linked to personal accounts should be examined. The sustainability of a system also involves the fact that critical operations are not tied to a single person’s account.
7. Stabilise First, Redesign Second
Instead of changing the entire architecture in the first month, a healthier approach is to stabilize the critical operational and data accuracy risks. Re-design decisions should be made after the system has been sufficiently understood.
Conclusion
A good BI acquisition process is not just the delivery of files and passwords. Inventory, business rules, dependencies, operational procedures, and risks must be acquired together.
If you need to take over your existing BI system from another consultant or team explore our BI system takeover approach.