sys.dm_db_missing_index_groups
Returns information about what missing indexes are contained in a specific missing index group.
| Column name | Data type | Description |
|---|---|---|
|
index_group_handle |
int |
Identifies a missing index group. |
|
index_handle |
int |
Identifies a missing index that belongs to the group specified by index_group_handle. In SQL Server 2005, an index group contains only one index. |
Information returned by sys.dm_db_missing_index_groups is updated when a query is optimized by the query optimizer, and is not persisted. Missing index information is kept only until SQL Server is restarted. Database administrators should periodically make backup copies of the missing index information if they want to keep it after server recycling.
Neither column of the output result set is a key, but together they form an index key.
For information about enabling and disabling missing index information collection, see About the Missing Indexes Feature.
For information about limitations of this feature, see Limitations for Using the Missing Indexes Feature.
For information about transaction consistency in relation to the missing indexes dynamic management objects, see About the Missing Indexes Feature.
Reference
sys.dm_db_missing_index_columnssys.dm_db_missing_index_details
sys.dm_db_missing_index_group_stats
