Exam DP-300 topic 3 question 47 discussion

---- sys.dm_db_index_operational_stats: leaf_insert_count, leaf_delete_count, leaf_update_count, leaf_ghost_count, nonleaf_insert_count, nonleaf_delete_count, nonleaf_update_count, leaf_allocation_count, nonleaf_allocation_count, leaf_page_merge_count, nonleaf_page_merge_count range_scan_count, singleton_lookup_count, forwarded_fetch_count lob_fetch_in_pages, lob_fetch_in_bytes,lob_orphan_create_count, lob_orphan_insert_count ... waits and more... ---- sys.dm_db_index_usage_stats: user_seeks, user_scans, user_lookups, user_updates system_seeks, system_scans, system_lookups, system_updates Both DMVs are pretty useful, operational stats DMV only seem to lack seeks, otherwise it has scans and lookups similar to what usage stats DMV has. Probably I will pick operational stats DMV.

While sys.dm_db_index_usage_stats tracks logical usage statistics (seeks, scans, lookups, updates), sys.dm_db_index_operational_stats focuses on the actual operations and resource contention, providing a more granular view of index performance and resource utilization.

D. sys.dm_db_index_usage_stats is correct. https://learn.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-db-index-usage-stats-transact-sql?view=sql-server-ver16 Returns counts of different types of index operations and the time each type of operation was last performed. (This aligns more with the question than ys.dm_db_index_operational_stats).

C seems the better answer C details : https://learn.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-db-index-operational-stats-transact-sql?view=sql-server-ver16 D details : https://learn.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-db-index-usage-stats-transact-sql?view=sql-server-ver16

To identify the operations being performed on the nonclustered index named index1 in your Azure SQL database (DB1), you should use the following dynamic management view (DMV): C. Sys.dm_db_index_operational_stats Here’s why this DMV is the correct choice: Sys.dm_db_index_operational_stats: This DMV provides information about the operations performed on an index since the last time SQL Server was started or statistics were cleared. It includes counts of different types of operations, such as seeks, scans, updates, and deletes, which can help you understand how the index is being used by queries. Monitoring Index Usage: By querying Sys.dm_db_index_operational_stats for index1, you can gather insights into whether the index is being utilized efficiently or if there are certain operations (such as scans instead of seeks) that could be impacting query performance.

For diagnosing slow queries and understanding the detailed operations performed on index1, sys.dm_db_index_operational_stats is the correct choice. It gives you the specific operational details that are necessary to identify and troubleshoot performance issues effectively. While sys.dm_db_index_usage_stats is useful for understanding overall usage patterns, it lacks the detailed operational metrics needed for in-depth performance analysis.

C is the right answer according to Bing Chat

The correct answer is: C. Sys.dm_db_index_operational_stats This dynamic management view contains information about various operations performed on an index, including the number of seeks, inserts, updates, and deletes.

D. sys.dm_db_index_usage_stats Every individual seek, scan, lookup, or update on the specified index by one query execution is counted as a use of that index and increments the corresponding counter in this view. Information is reported both for operations caused by user-submitted queries, and for operations caused by internally generated queries, such as scans for gathering statistics. https://learn.microsoft.com/en-us/sql/relational-databases/system-dynamic-management-views/sys-dm-db-index-usage-stats-transact-sql?view=sql-server-ver16#remarks

C: dm_db_index_operational_stats provides: the information of leaf_insert_count, leaf_delete_count, leaf_update_count D: dm_db_index_useage_stats provides: the information of USER_SEEKS, USER_SCANS, USER_LOOKUPS, USER_UPDATES For the performance tuning, I choose D.