1Z0-184-25 Question 172
Select 2You are migrating a large set of vector data in CSV format into an Oracle Autonomous Database. The data includes geometry columns stored in SDO_GEOMETRY format. You decide to use SQLLoader to minimize loading time and maintain data integrity. Which two approaches should you include in your SQLLoader control file or command-line configuration to achieve efficient bulk loading?
- A
Disable direct path loading and insert rows one by one.
- B
Enable direct path loading by setting DIRECT=TRUE.
- C
Skip defining the geometry columns and rely on default character conversion.
- D
Use specialized field definitions or function calls in the control file for SDO_GEOMETRY columns.
- E
Manually split each geometry row into multiple records for SQL*Loader to process in segments.
Show answer and explanation
Correct answers: B, D
Explanation
When loading large volumes of vector data (SDO_GEOMETRY columns) with SQLLoader, Oracle recommends using direct path loading to minimize overhead and improve throughput. Properly defining geometry columns (for example, using a function-based or positional definition in your control file) ensures the data is inserted into SDO_GEOMETRY fields accurately. For more details, refer to the SQLLoader documentation and Oracle Spatial Developer's Guide for best practices on loading geometry data.
- A. Incorrect.
Option 1 is incorrect. Disabling direct path loading (i.e., using conventional path) increases overhead and slows the load process. For large vector datasets, direct path loading is typically more efficient.
- B. Correct.
Option 2 is correct. DIRECT=TRUE enables direct path loading, which writes data blocks directly to database files and significantly improves performance for large loads. It� a recommended practice when loading large volumes of data using SQL*Loader.
- C. Incorrect.
Option 3 is incorrect. If you skip defining geometry columns, SQL*Loader will attempt to store everything as simple text, ignoring spatial data structures. You need to map data accurately for geometry fields to ensure valid spatial data insertion.
- D. Correct.
Option 4 is correct. In the control file, specialized column specifications (or function-based loaders) for SDO_GEOMETRY columns ensure that the geometry values are properly interpreted and loaded. Proper field definitions help maintain correct spatial data formats.
- E. Incorrect.
Option 5 is incorrect. You typically do not manually split each geometry record across multiple rows for loading; SQL*Loader is designed to handle each geometry record as a single field, especially when properly defined in the control file.