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Oracle® Database Reference
11g Release 1 (11.1)

Part Number B28320-01
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INDEX_STATS

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 statistics
Column 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