| id | int | ID of table (for indid = 0 or 255). Otherwise, ID of table to which the index belongs. |
| status | int | Internal system-status information. |
| first | binary(6) | Pointer to the first or root page. |
| indid | smallint | ID of index: 1 = clustered index; >1 = nonclustered; 255 = entry for tables that have TEXT or IMAGE data |
| root | binary(6) | For indid >= 1 and < 255, root is the pointer to the root page. For indid = 0 or indid = 255, root is the pointer to the last page. |
| minlen | smallint | Minimum size of a row. |
| keycnt | smallint | Number of keys. |
| groupid | smallint | Filegroup ID on which the object was created. |
| dpages | int | For indid = 0 or indid = 1, dpages is the count of data pages used. For indid=255, it is set to 0. Otherwise, it is the count of index pages used. |
| reserved | int | For indid = 0 or indid = 1, reserved is the count of pages allocated for all indexes and table data. For indid = 255, reserved is a count of the pages allocated for text or image data. Otherwise, it is the count of pages allocated for the index. |
| used | int | For indid = 0 or indid = 1, used is the count of the total pages used for all index and table data. For indid = 255, used is a count of the pages used for text or image data. Otherwise, it is the count of pages used for the index. |
| rowcnt | bigint | Data-level rowcount based on indid = 0 and indid = 1. For indid = 255, rowcnt is set to 0. |
| rowmodctr | int | Counts the total number of inserted, deleted, or updated rows since the last time statistics were updated for the table. |
| xmaxlen | smallint | Maximum size of a row. |
| maxirow | smallint | Maximum size of a nonleaf index row. |
| OrigFillFactor | tinyint | Original fillfactor value used when the index was created. This value is not maintained; however, it can be helpful if you need to re-create an index and do not remember what fillfactor was used. |
| reserved1 | tinyint | Reserved. |
| reserved2 | int | Reserved. |
| FirstIAM | binary(6) | Reserved. |
| impid | smallint | Reserved. Index implementation flag. |
| lockflags | smallint | Used to constrain the considered lock granularities for an index. For example, a lookup table that is essentially read-only could be set up to do only table level locking to minimize locking cost. |
| pgmodctr | int | Reserved. |
| keys | varbinary(816) | List of the column IDs of the columns that make up the index key. |
| name | sysname | Name of table (for indid = 0 or 255). Otherwise, name of index. |
| statblob | image | Statistics BLOB. |
| maxlen | int | Reserved. |
| rows | int | Data-level rowcount based on indid = 0 and indid = 1, and the value is repeated for indid >1. For indid = 255, rows is set to 0. Provided for backward compatibility. |