OceanBase has released version 4.3.5_CE_BP5_HF2 on January 28, 2026. This update targets specific stability and performance regressions, particularly within vector database operations and complex table management scenarios.
Vector Index Enhancements
A significant portion of the changelog addresses vector index operations. The release fixes a bug where vector index rebuilds would fail without deleting LOB metadata. It also resolves an invalid timestamp error encountered when creating vector indexes on large partitioned tables.
Notably, the update introduces a new capability via dbms_vector.set_attribute, allowing users to configure the parallelism and execution cycle for automatic vector index rebuilds. This feature provides administrators with more granular control over resource usage during index maintenance.
Stability and Performance Fixes
Beyond vector features, the patch resolves several blocking issues. It fixes a scenario where Change Data Capture (CDC) processes would hang when handling LOB data. It also addresses a DROP TABLE error (4038) that occurred when tables contained NOORDER auto-increment columns and the leader location had not been flushed. Additionally, the release mitigates a core dump issue in the vectorization 2.0 month_name expression optimization and an out-of-memory error triggered during SQL execution with tenant switching.
Performance anomalies caused by Buffer tables and slow queries on materialized views without base tables have also been addressed.