Oracle 12c: index treedump

oracle 12C的index treedump比11G有了一点小变化, 这里简短的记录一下.
branch: 0x300252b 50341163 (0: nrow: 3, level: 1)
leaf: 0x300252c 50341164 (-1: row:485.0 avs:823)

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