Schemas:: ACCOUNT_USAGE

TABLE_DML_HISTORY View¶

This Account Usage view can be used to determine the magnitude and effects of the DML operations performed on a table. Note that these DML operations include ones initiated by Snowpipe but exclude operations initiated by background maintenance services (e.g. Automatic Clustering, maintenance for materialized views and search optimization, etc.).

You can query this view with the QUERY_HISTORY View and the LOAD_HISTORY View to identify the DML operations that cause a significant amount of churn. This can help you to identify opportunities for optimization.

In addition, you can query this view with the AUTOMATIC_CLUSTERING_HISTORY View and the SEARCH_OPTIMIZATION_HISTORY View to visualize the relationship between these DML operations and the credits charged for Automatic Clustering and the search optimization service. (These services can be triggered by DML operations.)

Columns¶

Column Name	Data Type	Description
START_TIME	TIMESTAMP_LTZ	Start of the time range (on the hour mark) during which the DML operations were performed.
END_TIME	TIMESTAMP_LTZ	End of the time range (on the hour mark) during which the DML operations were performed.
TABLE_ID	NUMBER	Internal/system-generated identifier for the table modified by the DML operations.
TABLE_NAME	TEXT	Name of the table modified by the DML operations.
SCHEMA_ID	NUMBER	Internal/system-generated identifier for the schema that contains the table modified by the DML operations.
SCHEMA_NAME	TEXT	Name of the schema that contains the table modified by the DML operations.
DATABASE_ID	NUMBER	Internal/system-generated identifier for the database that contains the table modified by the DML operations.
DATABASE_NAME	TEXT	Name of the database that contains the table modified by the DML operations.
PARTITIONS_ADDED	NUMBER	Number of partitions added by DML operations performed by users on the table during the START_TIME and END_TIME window.
PARTITIONS_REMOVED	NUMBER	Number of partitions removed by DML operations performed by users on the table during the START_TIME and END_TIME window.
ROWS_ADDED	NUMBER	Number of rows added by DML operations performed by users on the table during the START_TIME and END_TIME window.
ROWS_REMOVED	NUMBER	Number of rows removed by DML operations performed by users on the table during the START_TIME and END_TIME window.
ROWS_UPDATED	NUMBER	Number of rows updated by DML operations performed by users on the table during the START_TIME and END_TIME window.

Usage Notes¶

Latency for the view may be up to 6 hours.

Examples¶

List the tables that have had the most partitions added and removed due to DML operations within the last 24 hours:

SELECT * FROM snowflake.account_usage.table_dml_history
WHERE start_time > DATEADD(hour, -24, CURRENT_TIMESTAMP())
ORDER BY partitions_added + partitions_removed DESC;

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