`INDEX_STATS`

stores information from the last `ANALYZE INDEX ... VALIDATE STRUCTURE`

statement.

Note:

The`ANALYZE INDEX ... VALIDATE STRUCTURE OFFLINE`

statement must be used in order to collect statisticsColumn | Datatype | NULL | Description |
---|---|---|---|

`HEIGHT` |
`NUMBER` |
Height of the B-Tree | |

`BLOCKS` |
`NUMBER` |
`NOT NULL` |
Blocks allocated to the segment |

`NAME` |
`VARCHAR2(30)` |
`NOT NULL` |
Name of the index |

`PARTITION_NAME` |
`VARCHAR2(30)` |
Name of the partition of the index which was analyzed. If the index is not partitioned, NULL is returned. | |

`LF_ROWS` |
`NUMBER` |
Number of leaf rows (values in the index) | |

`LF_BLKS` |
`NUMBER` |
Number of leaf blocks in the B-Tree | |

`LF_ROWS_LEN` |
`NUMBER` |
Sum of the lengths of all the leaf rows | |

`LF_BLK_LEN` |
`NUMBER` |
Usable space in a leaf block | |

`BR_ROWS` |
`NUMBER` |
Number of branch rows in the B-Tree | |

`BR_BLKS` |
`NUMBER` |
Number of branch blocks in the B-Tree | |

`BR_ROWS_LEN` |
`NUMBER` |
Sum of the lengths of all the branch blocks in the B-Tree | |

`BR_BLK_LEN` |
`NUMBER` |
Usable space in a branch block | |

`DEL_LF_ROWS` |
`NUMBER` |
Number of deleted leaf rows in the index | |

`DEL_LF_ROWS_LEN` |
`NUMBER` |
Total length of all deleted rows in the index | |

`DISTINCT_KEYS` |
`NUMBER` |
Number of distinct keys in the index (may include rows that have been deleted) | |

`MOST_REPEATED_KEY` |
`NUMBER` |
How many times the most repeated key is repeated (may include rows that have been deleted) | |

`BTREE_SPACE` |
`NUMBER` |
Total space currently allocated in the B-Tree | |

`USED_SPACE` |
`NUMBER` |
Total space that is currently being used in the B-Tree | |

`PCT_USED` |
`NUMBER` |
Percent of space allocated in the B-Tree that is being used | |

`ROWS_PER_KEY` |
`NUMBER` |
Average number of rows per distinct key (this figure is calculated without consideration of deleted rows) | |

`BLKS_GETS_PER_ACCESS` |
`NUMBER` |
Expected number of consistent mode block reads per row, assuming that a randomly chosen row is accessed using the index. Used to calculate the number of consistent reads that will occur during an index scan. | |

`PRE_ROWS` |
`NUMBER` |
Number of prefix rows (values in the index) | |

`PRE_ROWS_LEN` |
`NUMBER` |
Sum of lengths of all prefix rows | |

`OPT_CMPR_COUNT` |
`NUMBER` |
Optimal key compression length | |

`OPT_CMPR_PCTSAVE` |
`NUMBER` |
Corresponding space savings after an `ANALYZE` |