实验环境

搭建平台：VMware Workstation

OS：RHEL 6.10

Grid&DB：Oracle 11.2.0.4

SQL参考

select a.column_name,

b.num_rows,

a.num_distinct cardinality,

round(a.num_distinct / b.num_rows * 100, 2) selectivity,

a.histogram,

a.num_buckets

from dba_tab_col_statistics a, dba_tables b

where a.owner = b.owner

and a.table_name = b.table_name

and a.owner = 'xxx' --用户名

and a.table_name = 'xxx'; --表名

ITPub博客

【TUNE_ORACLE】查看每个列的选择性和基数SQL参考