Tag: 12cR2

Redo volume optimization in 12c R2

I was using SLOB to compare the throughput between 12.1 and 12.2 databases, and was surprised to see that the average redo size per transaction was ~18.5KB on 12cR2, and ~339KB on 12cR1. Understanding this difference was important for the…

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Bushy join trees in Oracle 12.2

There are multiple optimizer features introduced in the Oracle Database 12.2 Release. Bushy Join Trees is the one that I’ll be demonstrating in this post. First, I’ll create four tables with two indexes: create table t1 as select rownum n1,…

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