可以查询统计信息的一些视图
[*]DBA_TABLES
[*]DBA_INDEXES
[*]DBA_OBJECT_TABLES
[*]DBA_TAB_STATISTICS
[*]DBA_IND_STATISTICS
[*]DBA_TAB_COL_STATISTICS
[*]DBA_TAB_HISTOGRAMS
[*]DBA_PART_HISTOGRAMS
[*]DBA_TAB_PARTITIONS
[*]DBA_TAB_SUBPARTITIONS
[*]DBA_IND_PARTITIONS
[*]DBA_IND_SUBPARTITIONS
[*]DBA_PART_COL_STATISTICS
[*]DBA_SUBPART_COL_STATISTICS
[*]DBA_SUBPART_HISTOGRAMS
[*]DBA_CLUSTERS
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