★ LANGUAGE primary ★ DEVICE I/O cross-listed
SlimeTree-VSAM — Bench procedure and primary materials
For evaluators and procurement. The measurement conditions and dataset scale behind sequential cursor 480×, random key 267×, and the 1-billion-record nightly batch 19.5h → 4.4 min measured in same-host bench vs PostgreSQL 16; the SHA-256 audit-chain regulatory alignment; and the drop-in integration procedure with SlimeCOBOL Phase D emit.
For product overview and deployment scenarios, see the product page (/products/language/slimetree-vsam/). This page focuses on primary materials for reproduction and verification.
1. Same-host bench results Open
Rather than relying on third-party benchmarks, we use same-host bench that is reproducible in the customer's environment. PostgreSQL 16 runs directly under the same conditions, with realistic operational workloads for comparison.
| Metric | baseline (PostgreSQL 16) | SlimeTree-VSAM | Ratio |
|---|---|---|---|
| per-access (sequential cursor) | 1.0× (baseline) | 480× faster | 480× |
| per-access (random key) | 1.0× | 267× faster | 267× |
| 1B-record nightly batch (representative workload) | 19.5 hours | 4.4 minutes | 266× shorter |
1.1 Reproduction conditions
| baseline | PostgreSQL 16 (same host, default config + standard tuning). Version / OS / kernel / file system conditions can be aligned per contract |
|---|---|
| SlimeTree-VSAM | Single Rust binary (static link), same OS / same FS. Implements VSAM (KSDS / ESDS / RRDS) compatible access methods |
| workload | 1-billion-record-equivalent operational records (representative banking-core batch), mixed sequential-cursor full-scan + random-key retrieval |
| host | Same-host bench (eliminates network effects). In production: SAN / NAS / direct-attached storage all supported |
| metrics | per-access latency / total throughput / wall clock. Concurrent jobs, cache conditions, and disk-I/O conditions explicitly stated |
| reproduction kit | After NDA: bench script + sample-dataset spec + expected-value ranges provided |
2. Drop-in integration with SlimeCOBOL Phase D emit Open
SlimeTree-VSAM is designed as the DB target for SlimeCOBOL Phase D (QSAM / VSAM emit). Verification confirms that the VSAM access output by Phase D is received unchanged on the SlimeTree-VSAM side.
| RECFM compatibility | Fixed (F) / Variable (V) / with-control (M) / Blocked (B) reproduced bit-exact |
|---|---|
| Access method | KSDS (key-sequenced) / ESDS (entry-sequenced) / RRDS (relative-record) all auto-routed by the emitter. Drop-in |
| Encoding | EBCDIC / packed decimal / zoned decimal mainframe types preserved (no conversion) |
| Audit linkage | SlimeCOBOL's bit-exact transcription result connects directly to SlimeTree-VSAM's SHA-256 audit chain. Transcription → storage → audit form a three-stage tamper-detection chain |
3. SHA-256 audit chain Open
Every write operation on SlimeTree-VSAM is recorded as a SHA-256 chain; tamper detection is built into the backend. After-the-fact audit works in air-gap environments (no network access).
- The Write-Ahead Log is SHA-256 chained, each record embedding the previous hash
- Replay is deterministic — the same inputs regenerate the same chain; a divergence isolates the tamper point
- Air-gap audit: completes inside the internal audit chain without external network
- Aligns with bit-exact audit requirements of regulated industries (banking, insurance, public sector, healthcare)
4. Patent Coverage public only — text NDA-gated
SlimeTree-VSAM implements VSAM-standard-compatible access methods in native Rust, and the implementation-level simultaneous achievement of performance and audit is related to the SlimeRESCUE / SlimeNENC patent family. Text access via contact → after NDA.
5. Implementation (code) Distribution preparing
| Rust implementation | Single Rust binary (static link). Dependencies: standard library + cryptographic hash. WASM build in preparation (restricted access-method subset, for browser evaluation) |
|---|---|
| Access methods | KSDS / ESDS / RRDS all implemented, bit-exact RECFM supported |
| Bench harness | Same-condition replay scripts for PostgreSQL 16 comparison, dataset generator, measurement logger, result aggregator |
| SlimeCOBOL integration | Drop-in connection test suite with Phase D emit, RECFM bit-exact verification |
Distribution forms (evaluation licence / joint PoC / sponsored development / OEM integration) via contact or the partners page.
6. Related
- Product page: SlimeTree-VSAM — product detail (the nightly-batch collapse problem, industry ROI, SlimeCOBOL integration)
- Deep-dive blog: 480× PostgreSQL — SlimeTree-VSAM as the option that rescues VSAM holdouts (Japanese)
- Related news: research releases and announcements
- Same family, semantic-driven variant: SlimeTree-RLM + primary materials
- Companion products: SlimeCOBOL (the Phase D DB drop-in pair), SlimeNENC family
- Categories: LANGUAGE products / DEVICE (cross-listed) / Resource home