table statistics:
- number of rows
- number of blocks
- average length of rows
column statistics
- number of distinct values in column
- number of nulls in column
- data distribution (histogram)
index statistics
- number of leaf blocks
- levels
- clustering factor
system statistics
- I/O performance and utilization
- CPU performance and utilization
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/37724/viewspace-152508/ ，如需转载，请注明出处，否则将追究法律责任。
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