Skip Headers
Oracle® Database Reference
10g Release 2 (10.2)

Part Number B14237-02
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Index
Index
Go to Master Index
Master Index
Go to Feedback page
Feedback

Go to previous page
Previous
Go to next page
Next
View PDF

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