SET AUTOTRACE参数 SET AUTOTRACE OFF ---------------- 不生成AUTOTRACE 报告,这是缺省模式 SET AUTOTRACE ON EXPLAIN ------ AUTOTRACE只显示优化器执行路径报告 SET AUTOTRACE ON STATISTICS -- 只显示执行统计信息 SET AUTOTRACE ON ------------
一篇解释的非常好的关于行迁移(row migrated)和行连接(row chained)的文章. Dear Tom,I have a table with 25% chained rows.I am trying to determine the impact of this chaining and rebuild it if needed.To determine, whether I
SET AUTOTRACE OFF ---------------- 不生成AUTOTRACE 报告,这是缺省模式SET AUTOTRACE ON EXPLAIN ------ AUTOTRACE只显示优化器执行路径报告SET AUTOTRACE ON STATISTICS -- 只显示执行统计信息SET AUTOTRACE ON ----------------- 包含执行计划和统计信息