system_history.query_history

Records detailed logs of all SQL query executions in Databend. For each query, two entries are generated: one when the query starts and another when it finishes. This table is valuable for monitoring query activity, auditing user actions, and analyzing performance metrics.

Fields

Field	Type	Description
log_type	TINYINT	The query status.
log_type_name	VARCHAR	The name of query status.
handler_type	VARCHAR	The protocol or handler used for the query (e.g., HTTPQuery, MySQL).
tenant_id	VARCHAR	The tenant identifier.
cluster_id	VARCHAR	The cluster identifier.
node_id	VARCHAR	The node identifier.
sql_user	VARCHAR	The user who executed the query.
sql_user_quota	VARCHAR	The quota information of the user.
sql_user_privileges	VARCHAR	The privileges of the user.
query_id	VARCHAR	The unique identifier for the query.
query_kind	VARCHAR	The kind of query (e.g., Query, Insert, CopyIntoTable, etc.).
query_text	VARCHAR	The SQL text of the query.
query_hash	VARCHAR	The hash value of the query text.
query_parameterized_hash	VARCHAR	The hash value of the query regardless of the specific values.
event_date	DATE	The date when the event occurred.
event_time	TIMESTAMP	The timestamp when the event occurred.
query_start_time	TIMESTAMP	The timestamp when the query started.
query_duration_ms	BIGINT	The duration of the query in milliseconds.
query_queued_duration_ms	BIGINT	The time the query spent in the queue in milliseconds.
current_database	VARCHAR	The database in use when the query was executed.
written_rows	BIGINT UNSIGNED	The number of rows written by the query.
written_bytes	BIGINT UNSIGNED	The number of bytes written by the query.
join_spilled_rows	BIGINT UNSIGNED	The number of rows spilled during join operations.
join_spilled_bytes	BIGINT UNSIGNED	The number of bytes spilled during join operations.
agg_spilled_rows	BIGINT UNSIGNED	The number of rows spilled during aggregation operations.
agg_spilled_bytes	BIGINT UNSIGNED	The number of bytes spilled during aggregation operations.
group_by_spilled_rows	BIGINT UNSIGNED	The number of rows spilled during group by operations.
group_by_spilled_bytes	BIGINT UNSIGNED	The number of bytes spilled during group by operations.
written_io_bytes	BIGINT UNSIGNED	The number of bytes written to IO.
written_io_bytes_cost_ms	BIGINT UNSIGNED	The IO cost in milliseconds for writing.
scan_rows	BIGINT UNSIGNED	The number of rows scanned by the query.
scan_bytes	BIGINT UNSIGNED	The number of bytes scanned by the query.
scan_io_bytes	BIGINT UNSIGNED	The number of IO bytes read during scanning.
scan_io_bytes_cost_ms	BIGINT UNSIGNED	The IO cost in milliseconds for scanning.
scan_partitions	BIGINT UNSIGNED	The number of partitions scanned.
total_partitions	BIGINT UNSIGNED	The total number of partitions involved.
result_rows	BIGINT UNSIGNED	The number of rows in the query result.
result_bytes	BIGINT UNSIGNED	The number of bytes in the query result.
bytes_from_remote_disk	BIGINT UNSIGNED	The number of bytes read from remote disk.
bytes_from_local_disk	BIGINT UNSIGNED	The number of bytes read from local disk.
bytes_from_memory	BIGINT UNSIGNED	The number of bytes read from memory.
client_address	VARCHAR	The address of the client that issued the query.
user_agent	VARCHAR	The user agent string of the client.
exception_code	INT	The exception code if the query failed.
exception_text	VARCHAR	The exception message if the query failed.
server_version	VARCHAR	The version of the server that processed the query.
query_tag	VARCHAR	The tag associated with the query.
has_profile	BOOLEAN	Whether the query has an associated execution profile.
peek_memory_usage	VARIANT	The peak memory usage during query execution (as a JSON object).
session_id	VARCHAR	The session identifier associated with the query.

Examples

Query the history for a specific query using its query_id

SELECT * FROM system_history.query_history WHERE query_id = '4e1f50a9-bce2-45cc-86e4-c7a36b9b8d43';

*************************** 1. row ***************************
                log_type: 2
           log_type_name: Finish
            handler_type: HTTPQuery
               tenant_id: test_tenant
              cluster_id: test_cluster
                 node_id: jxSgvulZFAq1sDckR1bu85
                sql_user: root
          sql_user_quota: NULL
     sql_user_privileges: NULL
                query_id: 4e1f50a9-bce2-45cc-86e4-c7a36b9b8d43
              query_kind: Query
              query_text: SELECT * FROM t
              query_hash: cd36a2072e7f9deaa746db7480200944
query_parameterized_hash: cd36a2072e7f9deaa746db7480200944
              event_date: 2025-06-12
              event_time: 2025-06-12 03:31:35.135987
        query_start_time: 2025-06-12 03:31:35.041725
       query_duration_ms: 94
query_queued_duration_ms: 0
        current_database: default
            written_rows: 0
           written_bytes: 0
       join_spilled_rows: 0
      join_spilled_bytes: 0
        agg_spilled_rows: 0
       agg_spilled_bytes: 0
   group_by_spilled_rows: 0
  group_by_spilled_bytes: 0
        written_io_bytes: 0
written_io_bytes_cost_ms: 0
               scan_rows: 1
              scan_bytes: 20
           scan_io_bytes: 605
   scan_io_bytes_cost_ms: 0
         scan_partitions: 1
        total_partitions: 1
             result_rows: 1
            result_bytes: 20
  bytes_from_remote_disk: 74
   bytes_from_local_disk: 0
       bytes_from_memory: 0
          client_address: 127.0.0.1
              user_agent: bendsql/0.26.2-unknown
          exception_code: 0
          exception_text: 
          server_version: v1.2.753-nightly-c3d5fabb79(rust-1.88.0-nightly-2025-06-12T01:48:36.733925000Z)
               query_tag: 
             has_profile: NULL
       peek_memory_usage: {"jxSgvulZFAq1sDckR1bu85":223840}
              session_id: e3c54c32-f3c0-4ea9-bdd2-65701aa3f2a6