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Copy file name to clipboardExpand all lines: articles/postgresql/flexible-server/concepts-query-store.md
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title: Query Store - Azure Database for PostgreSQL - Flex Server
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description: This article describes the Query Store feature in Azure Database for PostgreSQL - Flex Server.
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title: Query Store - Azure Database for PostgreSQL - Flexible Server
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description: This article describes the Query Store feature in Azure Database for PostgreSQL - Flexible Server.
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author: ssen-msft
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ms.author: ssen
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ms.service: postgresql
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| pgms_wait_sampling.query_capture_mode | Sets which statements are tracked for wait stats. | none | none, all|
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| Pgms_wait_sampling.history_period | Set the frequency, in milliseconds, at which wait events are sampled. | 100 | 1-600000 |
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> [!NOTE]
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> **pg_qs.query_capture_mode** supersedes **pgms_wait_sampling.query_capture_mode**. If pg_qs.query_capture_mode is NONE, the pgms_wait_sampling.query_capture_mode setting has no effect.
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> [!NOTE]
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> **pg_qs.query_capture_mode** supersedes **pgms_wait_sampling.query_capture_mode**. If pg_qs.query_capture_mode is NONE, the pgms_wait_sampling.query_capture_mode setting has no effect.
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Use the [Azure portal](howto-configure-server-parameters-using-portal.md) to get or set a different value for a parameter.
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## Limitations and known issues
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- If a PostgreSQL server has the parameter `default_transaction_read_only` on, Query Store will not capture any data.
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## Next steps
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- Learn more about [scenarios where Query Store can be especially helpful](concepts-query-store-scenarios.md).
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- Learn more about [best practices for using Query Store](concepts-query-store-best-practices.md).
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