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Aikesheng Open Source Community
Aikesheng Open Source Community
Sep 16, 2025 · Databases

Why Oracle VARCHAR2 Fails at 4000 Bytes and How to Fix It

This article analyzes a real‑world OceanBase‑to‑Oracle incremental sync failure caused by VARCHAR2 length limits, explains the role of NLS_LENGTH_SEMANTICS and MAX_STRING_SIZE, and provides three practical solutions—including extending string size, using CLOB fields, and PL/SQL workarounds—to reliably insert data exceeding 4000 bytes.

DatabaseSyncLengthSemanticsOracle
0 likes · 11 min read
Why Oracle VARCHAR2 Fails at 4000 Bytes and How to Fix It
dbaplus Community
dbaplus Community
May 24, 2025 · Databases

How to Recover Data After an Oracle TRUNCATE Accident

When an Oracle table is accidentally truncated, this guide explains what TRUNCATE does, why recovery is difficult, and walks through four practical tools—Fy_Recover_Data, ODU, BBED, and GDUL—detailing step‑by‑step commands to restore the lost data safely.

Data RecoveryDatabase ToolsOracle
0 likes · 5 min read
How to Recover Data After an Oracle TRUNCATE Accident