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Aikesheng Open Source Community

Dec 24, 2024 · Databases

Understanding OceanBase V3 and V4 Statistics Tables and Best Practices for Collecting Statistics

This article explains the differences between OceanBase V3 and V4 statistics storage, clarifies the optimal way to query V3 statistics for sys, MySQL, and Oracle tenants, and outlines the unified approach and recommended DBMS_STATS usage in V4.

DBMS_STATSOceanBaseV3

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Understanding OceanBase V3 and V4 Statistics Tables and Best Practices for Collecting Statistics

37 Interactive Technology Team

Jul 27, 2022 · Mobile Development

Android APK Digital Signature: Purpose, Principles, and v1‑v4 Signing Schemes

Android APK digital signatures ensure app integrity and author authenticity by hashing files and signing with a private key, with four schemes—v1 (JAR‑style per‑file digests), v2 (whole‑APK block), v3 (key‑rotation support), and v4 (external .idsig for fast incremental installs)—each offering progressively stronger protection and installation speed.

APK signingAndroidMobile Security

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Android APK Digital Signature: Purpose, Principles, and v1‑v4 Signing Schemes