Release 2.4 | SurrealDB

Features: Added CONTAINS/INSIDE planning consistent with substring semantics; use indexes only for flattened or set-based operators Made WebSocket limits…

Released Nov 24, 2025

2.4.0

Features:

Added CONTAINS/INSIDE planning consistent with substring semantics; use indexes only for flattened or set-based operators
Made WebSocket limits configurable
Added 32-bit floats by default for HNSW vector indexes
Exposed and tune RocksDB BlobDB options via environment variables
Aligned RocksDB blob defaults with upstream and make blob compression optional
Added configurable slow-query logging with parameter allow/deny filtering and normalised single-line output
Added disk space limits and read-only/deletion-only modes for RocksDB
Added notification caller when a connection is dropped
Added COUNT Index Support with Compaction System and Enable Concurrent Index Building for WASM
Added minimal implementation for 2.0 → 3.0 migration tool
Ensured reverse scan is used only with compatible datastore

Bug fixes:

Fixed SELECT with SPLIT so ORDER BY and START/LIMIT apply after splitting
Fixed OOM crash in COUNT index on large datasets by batching key retrieval
Fixed insert ignore with unique index still creates a record when index violated

Breaking changes:

CONTAINS/INSIDE planning made consistent with substring semantics - see language test example in this file with details on using the CONTAINSANY operator with indexes

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