This is an unacceptable solution for my project. EXCLUSIVE", meaning that another REFRESH MATERIALIZED VIEW CONCURRENTLY statement, which requests the same EXCLUSIVE lock, will have to wait until the earlier EXCLUSIVE lock is released. Since PostgreSQL 9.4 there is an CONCURRENTLY option for REFRESH MATERIALIZED VIEWS. We have two types of a refresh in PostgreSQL: non concurrently This refresh type does not produce any dead rows, but for the time of refreshing view is locked, and no data can be read from it. Add support for REFRESH MATERIALIZED VIEW CONCURRENTLY. You can avoid it using CONCURRENTLY option. To be able to REFRESH the materialized view we need to add a unique index. SQL Syntax Summary Add the unique index to the materialized view with the following script. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table’s data. A materialized view in Oracle is a database object that contains the results of a query. Refresh on Materialized View Dear TomI create materialized view like this :create materialized view dtl_budget_mvbuild immediaterefresh fastenable query rewriteasselect a.company, a.nu_budget_year, a.nu_version, b.nu_month, b.vc_stock_code,sum(b.nu_quantity) as nu_quantityfrom mst_budget a, … whole view is dropped and then it’s building query is run. During a refresh of an materialized view the view is locked exclusively, preventing other queries from accessing the view. HINT: Create a unique index with no WHERE clause on one or more columns of the materialized view. concurrently Materialized views, which store data based on remote tables are also, know as snapshots. Refresh the materialized view without locking out concurrent selects on the materialized view. If you want to avoid waiting for this lock for an undefined period, you may want to set the session variable lock_timeout to a sensible value. They're a new feature in Postgres 9.3. If you anticipate performing insert, update or delete operations on tables referenced by a materialized view concurrently with the refresh of that materialized view, and that materialized view includes joins and aggregation, Oracle recommends you use ON COMMIT fast refresh rather than ON DEMAND fast refresh. it waits for locks, the refresh can hang potentially forever. CONCURRENTLY. In this case, PostgreSQL creates a temporary view, compares it with the original one and makes necessary inserts, updates and deletes. REFRESH MATERIALIZED VIEW CONCURRENTLY view_name. I didn't need to touch very much outside of matview … Attached is a patch for REFRESH MATERIALIZED VIEW CONCURRENTLY for 9.4 CF1. SQL Commands. This allows reads to continue without any blocking while a REFRESH runs. Recenlty at Attribution, we've been implementing materiazlied views to speed up slow queries. It is my hope to get this committed during this CF to allow me to focus on incremental maintenance for the rest of the release cycle. Refreshed i.e. The new data appears atomically as part of transaction commit. Refresh Materialized View Concurrently(ish) in Postgres 9.3. Review questioned the Assert that a matview was not a system relation. What is materialized view. If then in turn the SQL query on the foreign database server hangs, e.g. Doc Index Tanzu Greenplum 6.13 Documentation; Reference Guide. Refresh the materialized view without locking out concurrent selects on the materialized view. This will be addressed separately. Please note, REFRESH MATERIALIZED VIEW statement locks the query data so you cannot run queries against it. ERROR: cannot refresh materialized view “public.materialized_view_example” concurrently. 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