How to refresh all materialized views in Postgresql 9.3 at once?

Question

I am loading a bunch of data into a PostgresQL 9.3 database and then I want to refresh all materialized views that depend on the updated tables. Is there a way to do it automat

Answer 1

The snippet below uses REFRESH MATERIALIZED VIEW CONCURRENTLY when a UNIQUE index exists for that view.

CREATE OR REPLACE FUNCTION public.refresh_materialized_views()
  RETURNS void
AS
$BODY$
  DECLARE
      refresh_sql text;
    BEGIN

    WITH matviews AS (
       SELECT t.oid,
              relname AS view_name,
              nspname AS schema_name
         FROM pg_class t
         JOIN pg_catalog.pg_namespace n ON n.oid = t.relnamespace
        WHERE t.relkind = 'm'
          AND nspname NOT LIKE 'pg-%'
    ), unique_indexes AS (
     SELECT m.oid,
            view_name,
            schema_name
       FROM pg_class i,
            pg_index ix,
            matviews m
      WHERE ix.indisunique = true
        AND ix.indexrelid = i.oid
        AND ix.indrelid = m.oid
    ), refresh_concurrently AS (
      SELECT 'REFRESH MATERIALIZED VIEW CONCURRENTLY ' || quote_ident(schema_name) || '.' || quote_ident(view_name) AS sql
        FROM unique_indexes
    ), refresh AS (
      SELECT 'REFRESH MATERIALIZED VIEW ' || quote_ident(schema_name) || '.' || quote_ident(view_name) AS sql
        FROM matviews
       WHERE oid != all (SELECT oid FROM unique_indexes)
    ), sql AS (
      SELECT sql FROM refresh_concurrently
      UNION ALL
      SELECT sql FROM refresh
    )

    SELECT string_agg(sql, E';\n') || E';\n' FROM sql INTO refresh_sql;

    EXECUTE refresh_sql;

    END;
$BODY$
LANGUAGE plpgsql VOLATILE;

This snippet accepts a schema name to limit the views that are refreshed.

CREATE OR REPLACE FUNCTION public.refresh_materialized_views(_schema text)
  RETURNS void
AS
$BODY$
  DECLARE
      refresh_sql text;
    BEGIN

    WITH matviews AS (
       SELECT t.oid,
              relname AS view_name,
              nspname AS schema_name
         FROM pg_class t
         JOIN pg_catalog.pg_namespace n ON n.oid = t.relnamespace
        WHERE t.relkind = 'm'
          AND nspname NOT LIKE 'pg-%'
          AND nspname = _schema
    ), unique_indexes AS (
     SELECT m.oid,
            view_name,
            schema_name
       FROM pg_class i,
            pg_index ix,
            matviews m
      WHERE ix.indisunique = true
        AND ix.indexrelid = i.oid
        AND ix.indrelid = m.oid
    ), refresh_concurrently AS (
      SELECT 'REFRESH MATERIALIZED VIEW CONCURRENTLY ' || quote_ident(schema_name) || '.' || quote_ident(view_name) AS sql
        FROM unique_indexes
    ), refresh AS (
      SELECT 'REFRESH MATERIALIZED VIEW ' || quote_ident(schema_name) || '.' || quote_ident(view_name) AS sql
        FROM matviews
       WHERE oid != all (SELECT oid FROM unique_indexes)
    ), sql AS (
      SELECT sql FROM refresh_concurrently
      UNION ALL
      SELECT sql FROM refresh
    )

    SELECT string_agg(sql, E';\n') || E';\n' FROM sql INTO refresh_sql;

    EXECUTE refresh_sql;

    END;
$BODY$
LANGUAGE plpgsql VOLATILE;