✏️ Explanatory Question
In Dynamics 365 Finance & Operations (D365 F&O), TempDB tables and InMemory tables are used for temporary data storage. However, they serve different purposes and have distinct characteristics.
| Feature | TempDB Table | InMemory Table |
|---|---|---|
| Storage Type | Stored in SQL Server TempDB | Stored in the application’s memory |
| Scope | Data is persisted temporarily in the database | Data is lost when the session ends |
| Performance | Suitable for large datasets and joins; better for performance-intensive queries | Faster for small datasets but limited in scalability |
| Transactions | Supports transactions and SQL-based operations | Does not support transactions |
| Data Retention | Data is removed when the table is out of scope or the session ends | Data is lost immediately when the session ends |
| Indexing | Supports indexing like normal SQL tables | Limited indexing capabilities |
| Best For | Large data processing, temporary reports, batch processing | Small datasets, quick lookups, session-based data |
There are two types of temporary tables in Dynamics 365 F&O, TempDB tables, and InMemory tables. The differences between them are described in the following grid:
| InMemory tables | TempDB tables |
| 1. Holds data temporarily in the client or server tier | 1. Holds data temporarily in the database until the scope is valid |
| 2. These tables can’t be stored in Database | 2. These tables are stored in the database |
| 3. Can’t apply security | 3. Can apply security |
| 4. We cannot use InMemory table buffers | 4. TempDB table buffer can be used in coding |