9/1/2023 0 Comments Vacuum analyze redshiftThe tbl_rows column shows the total number of rows, including the deleted and updated rows.The unsorted column shows the percentage of rows that need to be sorted.The sortkey_num column shows the number of columns in the sort key.If the table has an interleaved sort key, then this column displays the INTERLEAVED state. Here's an example output: Schema | table_id | table | diststyle | sortkey1 | sortkey_num | unsorted | tbl_rows | est_visible_rows | stats_off Specify the table and schema names in the WHERE clause: SELECT schema, table_id, "table", diststyle, sortkey1, sortkey_num, unsorted, tbl_rows, estimated_visible_rows, stats_off Note: The svv_vacuum_progress query returns only one row of results.Ĭheck the details of the table being vacuumed. If there is no vacuum running, then the svv_vacuum_progress query shows the status of the last run vacuum. The svv_vacuum_progress query also verifies the table name being vacuumed, the vacuum's status, and the estimated time remaining until completion. +-+-ĭata8 | Vacuum: initialize merge data8 | 4m 55s Table_name | status | time_remaining_estimate To check if the VACUUM operation is in progress, run the svv_vacuum_progress query: dev=# SELECT * FROM svv_vacuum_progress The following system tables and queries won’t work on Amazon Redshift Serverless. Note: The following is applicable to provisioned Amazon Redshift clusters. Then, follow the VACUUM best practices to troubleshoot and avoid any future issues. Use the svv_vacuum_progress query to check the status and details of your VACUUM operation. Concurrent tables, cluster queries, DDL statements, or ETL jobs.The queries presume, that the Redshift data source is configured to support native queries, what is done by adding the "supportsNativeQueries=true" as a translator property to the data source configuration.VACUUM is a resource-intensive operation, which can be slowed down by the following: This can be achieved by scheduling the following SQL job, for example, every night. Please consult Amazon Redshift documentation for details, how to configure Query concurrency on Amazon Redshift.įor optimal operation, Redshift requires that VACUUM and ANALYZE commands are run at regular intervals of time. On heavy load, an even higher number will become necessary. We recommend to allow at least 15 concurrent queries.
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