Questions tagged [materialized-view]

Defined like a view but holding persistent data like a table, Materialized Views are a feature of a number of RDBMSs including Oracle, DB2 and postgres. SQL Server has a similar feature called an Indexed View that is considered similar enough to come under this tag.

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Getting View of One to Many where Column Names are repeated with Indexed field

I have 4 tables joined with an inner join. 2 of these joined tables are 1 to Many relationships. Consider the following example return where t1 is table 1, t2 is table 2 and so forth. table 1 has a 1 ...
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33 views

Rebuild materialized view from massive base tables

We had a materialized view over two bae tables, which was set to refresh on demand, and we had an hourly job which fast refreshed the mview after a linux script inserted new records to the base tables....
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Create event/lambda from materialized view refresh in PostgreSQL

I have a materialized view in PostgreSQL that I refresh say every fifteen minutes. I want to create an event triggered if that materialized view is not empty upon refresh (so that I can send AWS ...
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Created a Materialized View in ORACLE which won't refresh

I created a materialized view log along with a materialized view called update_nboe based on table NBOE_ EMPLOYEES_TEST using the following code CREATE MATERIALIZED VIEW LOG ON NBOE_EMPLOYEES_TEST ...
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43 views

Postgres: How can I force index usage for view with latest rates?

We import currency rates into DB: CREATE TABLE currency_rate ( id int8 NOT NULL, date date NOT NULL, currency varchar(3) NOT NULL, rate numeric(12,6) NOT NULL, CONSTRAINT ...
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SQL Server - Is there a way to prevent shared range locks to 'infinity' when using an indexed view?

I have your basic header/details table (think orders and order details). The header table has an identity column as the clustered key, the detail has the header id and a line number column as the ...
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40 views

Multiple concurrent “REFRESH MATERIALIZED VIEW”: how to manage?

I have a large Postgres database with many tables, some with tens of millions of rows. Several working processes update the database concurrently. For faster searches, relevant data is compiled into a ...
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group several columns together in materialized view

For statistical reasons, I need to group several ids in a single column of a materialized view. This should form a list of ids from other tables with an info. Further processing will be done on this ...
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How to create a clustered index on a schema bound view with the least amount of contention caused?

I have a table with 100 billion rows in it, with an identity BIGINT column that is the primary key (and clustered index). I have a schema bound view on that table that is filtered down to the last 500 ...
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Does the Query Optimizer have the right to create Temporary (Materialized) Views if it enhances performance?

Does the Query Optimizer have the right to create Temporary (Materialized) Views which can enhance performance? Sorry if this question seem very trivial. Or in other words, does the query optimizer ...
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Why can't the query processor produce a query plan with a FORCESEEK hint when I'm INNER JOINing by the clustered index on both indexed views?

I'm getting the following error when I try to use the FORCESEEK hint with the query below: Msg 8622, Level 16, State 1, Line 96 Query processor could not produce a query plan because of the hints ...
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Why when I JOIN to a casted field in an index view, the execution plan warns about “type conversion in expression”?

I thought an indexed view was materialized and therefor stored on disk. If that's the case, I would've thought that any type conversions I'm doing in the view would materialize as that datatype on ...
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Do filtered indexed views cause contention on the underlying table when rows are added to the table that fall outside the filter?

If I create an indexed view on a table and the query on that table includes a filter, when new records are added to that table that don't fall into that filter (and therefor wouldn't show in the ...
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Why is casting a DATE field to VARCHAR datatype non-deterministic and is there a way to make it deterministic?

I'm trying to create an indexed view where the index is on a field in the view which is a hash of a bunch of the columns of the underlying table in the view. Here's an example: CREATE VIEW ...
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How to manage disk space allocation for materialized views?

Summary: I have materialized views in oracle 11g that seem to hog disk space, unlike normal tables that mark rows as deleted and stats eventually show them as free space (allocated to the table, ...
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Is subscription database considered as read-only?

I am not sure about that because while users implement SELECT from subscription database, publisher replicates data to the subscription server meaning that INSERT and UPDATE also take place (which are ...
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54 views

Indexed view referencing objects on two different schemas

When I try to create/alter a view to create an index like this CREATE UNIQUE CLUSTERED INDEX IDX_vSalPopulation ON sfdc.vSalPopulation (ID); I get the following error message Msg 1938, Level ...
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MSSQL - Lock escalation on partitioned indexed view

I'm using partitioned tables where I set LOCK_ESCALATION to AUTO to prevent lock escalation to table level, but keep it on partition level. On the top of that table I have indexed view which is ...
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How to make Indexed Views work for SQLCLR?

In SQL Server, the indexed view is a hellscape of limitations. But I need one. I have a formatter SQLCLR function that creates a prettified version of a domain key - users want to be able to search ...
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Materialized view bigger than table it is based on?

I have a database that's ~130 GB and one table makes up for most of this (85 GB). Because this table holds a lot of duplicates, we have a materialized view which basically uses a window function to ...
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110 views

MSSQL - How to support aggregate pushdown on indexed view with SUM(decimal)

I have an indexed view with non-clustered columnstore index, e.g. CREATE VIEW [dbo].[SalesAggregated] with schemabinding AS SELECT BusinessDate, ItemId ,...
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Oracle Materialized View - Is it Safe to Use Only ROWID as Record Identifier?

this is a question related to Oracle 12c. I'm currently trying to create MVs as data sources for Golden Gate replication. We need fast refresh because We have to replicate 60,000 rows + at one time ...
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502 views

Why SQL does not use the indexed view?

I have the following version of SQL Server: Microsoft SQL Server 2014 (SP3) (KB4022619) - 12.0.6024.0 (X64) Enterprise Edition (64-bit) on Windows NT 6.3 (Build 9600: ) (Hypervisor) I created ...
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Do Hive Materialized Views respond to added partitions to source tables?

Hive Materialized Views support partitions, CREATE MATERIALIZED VIEW [IF NOT EXISTS] [db_name.]materialized_view_name [DISABLE REWRITE] [COMMENT materialized_view_comment] [PARTITIONED ON (...
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Azure SQL - Modifying Indexed Views without downtime

We have a SQL Azure database with a large indexed view that supports a website with high traffic during business hours. One of our goals from a DevOps perspective to be able to ship software (...
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42 views

Different results from select and from materialized view

select distinct on (p) coalesce(native_fcm_token, push_token) p from session where user_id = 2779 and ((push_token is not null) or (native_fcm_token is not null)) returns 27 rows refresh ...
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Cronjob to check when Oracle Materialized View was last updated?

I have two database users in my Oracle DB and want to create MV's in User B which get their data from User A through a database link. I plan to autorefresh the MV's every night but want to make sure ...
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50 views

Create indexed view with fluctuating data behind

I´ve heard about indexed-views in MSSQL which can increase the performance. My problem is that I want to create a view which joins round about 5 tables. The tables are constantly updated and are ...
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mysql run out of memory during mview refresh

I want to create mview from mysql to Oracle using DBLink via odbc driver with Linux 64 bit os. but due to large number of Records around 2.5 cr records it raise the error ERROR at line 1: ORA-28500: ...
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35 views

Is it possible to execute a postgresql function when any view is refreshed?

I want to alert my application that are utilizing views when the view is refreshed. Is this possible using PostgreSQL built-in functionality? If not are there any other approaches to tackle this?
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Materialized views Performance

Postgres’ docs note: While access to the data stored in a materialized view is often much faster than accessing the underlying tables directly or through a view, the data is not always current; ...
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Ιndexed view after replication

I am trying to find a smart (no redundunt dataflow) way to aggregate data on views/tables to be used from our reporting tools. One given is that the reporting database is different from the oltp one, ...
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142 views

How do I force a Nested Loop join on Materialized View and Table in Oracle 12c

There is a third party app which generates a high-cost query that has a join on multiple tables. I created a materialized view on some of the tables using the same join that is originated in the ...
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118 views

Getting ORA-32042 even though i can create the view in SQL Developer

I have a strange problem creating a materialized view using the code generated by the export wizard. I have created a materialized view and pasted following code into the sql query tab from the popup....
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870 views

Why are some views listed as Materialized in MySQL explain statements if Materialized views don't exist in MySQL?

Hopefully the question is self explanatory. I've read that Materialized views do not exist in MySQL, yet sometimes I see something like this in EXPLAIN Can somebody clear this up for me? What's ...
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296 views

Does CREATE/REFRESH MATERIALIZED VIEW in PostgreSQL use the parallel planner?

I am wondering whether CREATE (with data) or REFRESH MATERIALIZED VIEW uses the parallel planner? When I EXPLAIN ANALYZE the query by itself (any query with parallel potential works here) without ...
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242 views

oracle-mysql fast refresh materialized view

Is is possible to Create Fast refresh enabled Materialized view from MySQL to Oracle . i know steps for oracle to oracle Fast refresh enabled Materialized view. But now the scenario is need to ...
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350 views

What are the advantages of using a Materialized View directly on a table?

Recently, in enterprise's Oracle database, I have seen some materialized views that filter directly columns of table without adding aggregate fields and without calling custom functions. Example: ...
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622 views

Is using indexed view with no expand on standard edition a must?

I have recently read the text below in 70-762 Developing SQL Databases (p. 67): The first benefit of using an indexed view is that when you use it Enterprise Edition of SQL Server, it uses the ...
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535 views

Creating materialized view is very slow

I have quite a complex query in PostgreSQL 10.4 on Amazon RDS (3 joins, quite a few conditions). It takes from 1.5 to 6 seconds to perform a select. However, when I want to create a materialized view ...
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370 views

What is the proper procedure for fixing materialized view replication?

Oracle 10 Standard: I have a number of materialized views built on pre-built tables. These are fast refreshed from a remote database over a link from one master db. They've generally been working ...
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600 views

Create a materialized view on commit with PIVOT function

I'm trying to create a materialized view with on commit refresh while using a PIVOT on it's select. I have the following tables: Events: represents an event that the system process. It's like a ...
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127 views

Bloat on Materialized Views

The Postgres documentation says that materialized views with concurrent refreshes generate bloat as usual tables, because it executes deletes and inserts. For usual tables, there are some queries to ...
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837 views

Export Materialized View from postgresql as a table?

I have a materialized view I created in Postgresql. I was wondering is there a way to pg_dump the materialized view as if they were tables, so when I import them into another database it sees it as ...
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34 views

How to aggregate transactions to form a stateful view which can be updated efficiently?

How to aggregate transactions to form a stateful view which can be updated efficiently? For example how to turn the following transactions: CREATE TABLE txns_combined(from_party,to_party,price,qty,...
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460 views

Postgres 9.5 Materialized View from a table with jsonb columns

For the purpose of improving performance of queries on a rather large table (5M+ rows) containing jsonb columns, I would like to create materialized views with data derived from those columns. ...
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346 views

Convert columns into rows for use with indexed/materalized view

I'd like to convert columns into rows for a given SQL Server table. The table effectively is an audit table; it stores a given old and new value in separate columns for a given user attribute (e.g. ...
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72 views

SQL Server - materialised (indexed) view not working as expected

I've created a materialised view in SQL Server, but when selecting from it I get the same performances and the same execution plan than when I select from the same query not "materialised". The view ...
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769 views

Autorefresh for Postgres materialised view?

Is it possible to set an automatic refresh frequency for materialized views? Here's the situation, I have an important but relatively small (20 thousand row) table that's subject to constant updates (...
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441 views

What is a good way to parameterize a materialized view on Postgres?

Given for example a materialized view like this (Postgres 10.3): create materialized view my_view as select * from my_table where sell_date < '2018-03-01'; The sell_date comparison value ('...