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Documentation
/ Operations Manual
Limits
This page contains DuckDB's built-in limit values.
Limit Values
| Limit | Default value | Configuration option | Comment |
|---|---|---|---|
| Array size | 100000 | - | |
| BLOB size | 4 GB | - | |
| Expression depth | 1000 | max_expression_depth |
|
| Memory allocation for a vector | 128 GB | - | |
| Memory use | 80% of RAM | memory_limit |
Note: This limit only applies to the buffer manager. |
| String size | 4 GB | - | |
| Temporary directory size | unlimited | max_temp_directory_size |
Size of Database Files
DuckDB doesn't have a practical limit for the size of a single DuckDB database file. We have database files using 15 TB+ of disk space and they work fine. However, connecting to such a huge database may take a few seconds, and checkpointing can be slower.