1Z0-184-25 Question 27
Select 2Your organization uses an Oracle Autonomous Database provisioning with Oracle Database 23c to store product embeddings in a vector column named EMBEDDING_DATA within a table called PRODUCT_VECTORS. The table is indexed using an approximate nearest neighbor (ANN) vector index for rapid AI-driven searches. The data science team has updated certain product embeddings, and you must perform DML operations on the EMBEDDING_DATA column. Which two statements are correct about performing these vector updates while ensuring the ANN index remains valid and query performance is maintained?
- A
You can directly update the entire vector column with new embeddings via a standard UPDATE statement, and the ANN index is automatically maintained.
- B
You must manually rebuild the ANN index after every single record update to keep the index in sync.
- C
Partial vector updates are supported via subscript notation, and they do not impact the ANN index configuration.
- D
The dimension of the updated vector must match the column definition; otherwise, the update operation will fail.
Show answer and explanation
Correct answers: A, D
Explanation
When performing DML operations on vectors in Oracle Database 23c (including Autonomous Database on OCI), you can update the entire vector using a simple UPDATE statement. Oracle automatically maintains the ANN vector index for typical DML changes, eliminating the need for repeated manual index rebuilds. However, partial updates to only part of the vector are currently not supported. Additionally, the dimension of the new vector must align with the table� defined vector dimension or the update operation will fail. Refer to the official Oracle Database 23c documentation on vector data types and indexing for configuration and maintenance best practices.
- A. Correct.
Correct. Oracle Database 23c supports in-place updates of the entire vector through standard DML statements like UPDATE. The ANN index is automatically maintained for normal DML operations, so you do not need to rebuild it for each row change.
- B. Incorrect.
Incorrect. Oracle Database automatically manages vector indexes for typical DML operations (INSERT, UPDATE, DELETE). Manually rebuilding the index after every update is unnecessary and would be inefficient in production. Rebuilds may be required only in exceptional cases (e.g., structural changes).
- C. Incorrect.
Incorrect. Current Oracle Database 23c vector data management does not support partial updates to only part of the vector using subscript notation. If the vector changes, you typically replace it in its entirety.
- D. Correct.
Correct. When replacing vectors, you must ensure the dimensionality matches the column's defined dimension. If the dimension changes, the update will fail because it conflicts with the schema's vector specification.