OceanBase 4.3.5 CE BP6 release addresses critical vector index and stability issues

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OceanBase announced the v4.3.5 CE BP6 release on 14 April 2026. The update focuses on stability and performance of vector‑based indexes as well as several core‑dump and memory‑leak problems.

  • Resolved Hint‑based multi‑value index query error 1235.
  • Fixed a potential core dump when rebuilding vector indexes.
  • Addressed HNSW index query failures (error ‑7605) in LATENCY_FIRST mode and prevented IVF index memory explosion.
  • Eliminated double‑free errors in the vector index adapter.
  • Patched an IVF cache manager memory leak.
  • Corrected data loss during parallel HNSW index back‑fill.
  • Fixed hanging of delete‑vector‑index operations after offline DDL failures.
  • Added missing mutual‑exclusion logic between vector‑index DDL and background tasks to stop DDL hangs.
  • Ensured scans on vector indexes with generated columns return correct results.
  • Repaired abnormal memory‑data synchronization for vector indexes.
  • Fixed a core dump in Hash Join when using the nestloop mode.
  • Resolved lock‑wait manager wake‑up omission that could suspend transactions.

These fixes improve the reliability of OceanBase's vector search capabilities and overall transaction processing, making the platform more suitable for AI‑driven workloads and high‑concurrency environments.