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sys.query_store_wait_stats (Transact-SQL)

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Applies to: SQL Server 2017 (14.x) and later Azure SQL Database

Contains information about the wait information for the query.

Column name Data type Description
wait_stats_id bigint Identifier of the row representing wait statistics for the plan_id, runtime_stats_interval_id, execution_type and wait_category. It is unique only for the past runtime statistics intervals. For the currently active interval, there may be multiple rows representing wait statistics for the plan referenced by plan_id, with the execution type represented by execution_type and the wait category represented by wait_category. Typically, one row represents wait statistics that are flushed to disk, while other(s) represent in-memory state. Hence, to get actual state for every interval you need to aggregate metrics, grouping by plan_id, runtime_stats_interval_id, execution_type and wait_category.
plan_id bigint Foreign key. Joins to sys.query_store_plan (Transact-SQL).
runtime_stats_interval_id bigint Foreign key. Joins to sys.query_store_runtime_stats_interval (Transact-SQL).
wait_category tinyint Wait types are categorized using the table below, and then wait time is aggregated across these wait categories. Different wait categories require a different follow-up analysis to resolve the issue, but wait types from the same category lead to similar troubleshooting experiences, and providing the affected query in addition to the waits is the missing piece to complete the majority of such investigations successfully.
wait_category_desc nvarchar(128) For textual description of the wait category field, review the table below.
execution_type tinyint Determines type of query execution:

0 - Regular execution (successfully finished)

3 - Client initiated aborted execution

4 - Exception aborted execution
execution_type_desc nvarchar(128) Textual description of the execution type field:

0 - Regular

3 - Aborted

4 - Exception
total_query_wait_time_ms bigint Total CPU wait time for the query plan within the aggregation interval and wait category (reported in milliseconds).
avg_query_wait_time_ms float Average wait duration for the query plan per execution within the aggregation interval and wait category (reported in milliseconds).
last_query_wait_time_ms bigint Last wait duration for the query plan within the aggregation interval and wait category (reported in milliseconds).
min_query_wait_time_ms bigint Minimum CPU wait time for the query plan within the aggregation interval and wait category (reported in milliseconds).
max_query_wait_time_ms bigint Maximum CPU wait time for the query plan within the aggregation interval and wait category (reported in milliseconds).
stdev_query_wait_time_ms float Query wait duration standard deviation for the query plan within the aggregation interval and wait category (reported in milliseconds).
replica_group_id bigint Identifies the replica set number for this replica. Foreign key to sys.query_store_replicas.

Applies to: SQL Server (Starting with SQL Server 2022 (16.x))

Wait categories mapping table

"%" is used as a wildcard

Integer value Wait category Wait types include in the category
0 Unknown Unknown
1 CPU SOS_SCHEDULER_YIELD
2 Worker Thread* THREADPOOL
3 Lock LCK_M_%
4 Latch LATCH_%
5 Buffer Latch PAGELATCH_%
6 Buffer IO PAGEIOLATCH_%
7 Compilation* RESOURCE_SEMAPHORE_QUERY_COMPILE
8 SQL CLR CLR%, SQLCLR%
9 Mirroring DBMIRROR%
10 Transaction XACT%, DTC%, TRAN_MARKLATCH_%, MSQL_XACT_%, TRANSACTION_MUTEX
11 Idle SLEEP_%, LAZYWRITER_SLEEP, SQLTRACE_BUFFER_FLUSH, SQLTRACE_INCREMENTAL_FLUSH_SLEEP, SQLTRACE_WAIT_ENTRIES, FT_IFTS_SCHEDULER_IDLE_WAIT, XE_DISPATCHER_WAIT, REQUEST_FOR_DEADLOCK_SEARCH, LOGMGR_QUEUE, ONDEMAND_TASK_QUEUE, CHECKPOINT_QUEUE, XE_TIMER_EVENT
12 Preemptive PREEMPTIVE_%
13 Service Broker BROKER_% (but not BROKER_RECEIVE_WAITFOR)
14 Tran Log IO LOGMGR, LOGBUFFER, LOGMGR_RESERVE_APPEND, LOGMGR_FLUSH, LOGMGR_PMM_LOG, CHKPT, WRITELOG
15 Network IO ASYNC_NETWORK_IO, NET_WAITFOR_PACKET, PROXY_NETWORK_IO, EXTERNAL_SCRIPT_NETWORK_IOF
16 Parallelism CXCONSUMER, CXPACKET, CXSYNC_CONSUMER, CXSYNC_PORT, EXCHANGE, HT%, BMP%, BP%
17 Memory RESOURCE_SEMAPHORE, CMEMTHREAD, CMEMPARTITIONED, EE_PMOLOCK, MEMORY_ALLOCATION_EXT, RESERVED_MEMORY_ALLOCATION_EXT, MEMORY_GRANT_UPDATE
18 User Wait WAITFOR, WAIT_FOR_RESULTS, BROKER_RECEIVE_WAITFOR
19 Tracing TRACEWRITE, SQLTRACE_LOCK, SQLTRACE_FILE_BUFFER, SQLTRACE_FILE_WRITE_IO_COMPLETION, SQLTRACE_FILE_READ_IO_COMPLETION, SQLTRACE_PENDING_BUFFER_WRITERS, SQLTRACE_SHUTDOWN, QUERY_TRACEOUT, TRACE_EVTNOTIFF
20 Full Text Search FT_RESTART_CRAWL, FULLTEXT GATHERER, MSSEARCH, FT_METADATA_MUTEX, FT_IFTSHC_MUTEX, FT_IFTSISM_MUTEX, FT_IFTS_RWLOCK, FT_COMPROWSET_RWLOCK, FT_MASTER_MERGE, FT_PROPERTYLIST_CACHE, FT_MASTER_MERGE_COORDINATOR, PWAIT_RESOURCE_SEMAPHORE_FT_PARALLEL_QUERY_SYNC
21 Other Disk IO ASYNC_IO_COMPLETION, IO_COMPLETION, BACKUPIO, WRITE_COMPLETION, IO_QUEUE_LIMIT, IO_RETRY
22 Replication SE_REPL_%, REPL_%, HADR_% (but not HADR_THROTTLE_LOG_RATE_GOVERNOR), PWAIT_HADR_%, REPLICA_WRITES, FCB_REPLICA_WRITE, FCB_REPLICA_READ, PWAIT_HADRSIM
23 Log Rate Governor LOG_RATE_GOVERNOR, POOL_LOG_RATE_GOVERNOR, HADR_THROTTLE_LOG_RATE_GOVERNOR, INSTANCE_LOG_RATE_GOVERNOR, RBIO_RG_%

* Query Store tracks wait stats only during query execution, not during query compilation. This restricts Query Store's ability to track compilation wait stats.

Permissions

Requires the VIEW DATABASE STATE permission.

Next steps

Learn more about Query Store in the following articles: