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A materialized view takes a different approach: the query result is cached as a concrete ("materialized") table (rather than a view as such) that may be updated from the original base tables from time to time. This enables much more efficient access, at the cost of extra storage and of some data being potentially out-of-date.
View selection can be constrained by the total size of the selected set of aggregations, the time to update them from changes in the base data, or both. The objective of view selection is typically to minimize the average time to answer OLAP queries, although some studies also minimize the update time. View selection is NP-Complete.
ClickHouse is an open-source column-oriented DBMS (columnar database management system) for online analytical processing (OLAP) that allows users to generate analytical reports using SQL queries in real-time. ClickHouse Inc. is headquartered in the San Francisco Bay Area with the subsidiary, ClickHouse B.V., based in Amsterdam, Netherlands.
Materialized views were introduced by Oracle Database, while IBM Db2 provides so-called "materialized query tables" (MQTs) for the same purpose. Microsoft SQL Server introduced in its 2000 version indexed views which only store a separate index from the table, but not the entire data. PostgreSQL implemented materialized views in its 9.3 release.
Outlook 2007 – Follow steps under "Other Email Accounts." Outlook for Mac – Follow steps under "Update your email settings in Outlook for Mac." Windows 10 Mail – Follow steps for "Add an account using advanced setup." Windows Live Mail – Follow steps "To change server settings for your email service provider."
OLAP server MOLAP ROLAP HOLAP Offline Apache Doris Yes Yes Yes Yes Apache Druid: Yes Yes Yes Yes Apache Kylin: Yes No No Yes Apache Pinot: Yes Yes Yes Yes ClickHouse: Yes Yes Yes Yes Essbase: Yes No No IBM Cognos BI: Yes Yes Yes IBM Cognos TM1: Yes No No Cognos Insight Distributed mode: icCube Yes No No Yes Jedox OLAP Server: Yes No No No Kyvos ...
Use the IMAP settings below to download your email from AOL Mail into a third-party email app, like Thunderbird, Outlook, or Mac Mail. For accounts with a lot of content, it can take several days or longer to download everything.
Outlook 2007 – Follow steps under "Other Email Accounts." Outlook for Mac – Follow steps under "Update your email settings in Outlook for Mac." Windows 10 Mail – Follow steps for "Add an account using advanced setup." Windows Live Mail – Follow steps "To change server settings for your email service provider."