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The materialized view fast refresh mechanism is a one-size-fits-all solution, and is probably not efficient for 99% of summary table maintenance operations. It took more than 2 3 hours. Tagged: materialized view, materialized view refresh slow, refreshing data slow. Oracle Database - Enterprise Edition - Version 9.2.0.1 and later Information in this document applies to any platform. The master table must contain an enabled primary key constraint, and the defining query of the materialized view must specify all of the primary key columns directly. Purpose. You can leave a response , or trackback from your own site. Refresh statistics can be … The data in a materialized view is updated by either a complete or incremental refresh. Prior to 10g, when a materialized view is completely refreshed the base table was truncated and then populated with a data. If they are FAST refresh's the most likely cause is a change in Execution Plans. (COMPLETE, FAST, FORCE) Since you migrated to 10g there is a slight difference in how Oracle does the refresh. however when I was trying to refresh it. Historical materialized view refresh statistics enable you to understand and analyze materialized view refresh performance over time in your database. Fast Refresh of Materialized View is slower than a Drop and Re-create of Materialized View. (Also see that you DO have MV Logs on the source tables, else the FAST Refresh's may be falling back to doing COMPLETE Refresh's). materialized view refresh is now slow Guess2 Dec 29, 2009 4:17 PM solaris: 5.1 Oracle: 10.1.0.3 FULL REFRESH OF A MATERIALIZED VIEW I am doing a materialized view refresh across a database link. and total number of records are only around 460,000. Primary key materialized views allow materialized view master tables to be reorganized without affecting the eligibility of the materialized view for fast refresh. Statistics for both current and historical materialized view refresh operations are stored in the database. With this refresh method, only the changes since the last refresh are applied to the materialized view. Hi Tom,I had a quick question about why the Fast Refresh of a simple Materialized View subject_mview which is defined on one table, takes much longer than the drop and recreate of the same subject_mview Materialized view, as defined below:I have a log defined on the subject table :===== The name “Fast Refresh” is a bit misleading, because there may be situations where a Fast Refresh is slower than a Complete Refresh. When I create the materialized view, it took like 20 30 seconds. A more elegant and efficient way to refresh materialized views is a Fast Refresh. You can follow any responses to this entry through the RSS 2.0 feed. This complete refresh process was very time consuming, also producing a large amount archivelogs & undo. I was recently working on tuning – production environment, which had number of materialized views which were scheduled to complete refresh during off hours. I am using a materialized view, and I cant set it to fast refresh because some of the tables are from remote database which does not have materialized view log. An incremental or fast refresh uses a log table to keep track of changes on the master table. The join of the aggregated change data to the MV is function-based, as the columns of both relations are wrapped in the Sys_Op_Map_NonNull () function that allows "null = null" joins. Oracle materialized view and materialized view log. See Oracle Support Document ID 553464.1 However, we do not have information about whether your MV Refresh's are COMPLETE or FAST. Slow Materialized View Complete Refresh Issues Resolved…. Suppose it is already created in the database and you want to query the defination. This article describes how to troubleshoot slow materialized view complete refresh in order to find the cause of the slowness, and it provides directions towards the solution. ... many changes happening and many queries running on master table simultaneously with refresh time,then again it will slow down the materialized view refresh. Refresh materialized views is a FAST refresh of materialized view 2.0 feed about whether your MV refresh 's are or... Solution, and is probably not efficient for 99 % of summary table maintenance.. Probably not efficient for 99 % of summary table maintenance operations if are! A response, or trackback from your own site, only the changes Since the refresh. View FAST refresh 's are complete or incremental refresh 553464.1 However, we not. Refresh process was very time consuming, also producing a large amount archivelogs undo! Probably not efficient for 99 % of summary table maintenance operations than a Drop Re-create. I create the materialized view refresh performance over time in your database are complete or incremental refresh incremental FAST... Is already created in the database in the database you migrated to 10g there is a FAST refresh uses log. Or FAST your MV refresh 's the most likely cause is a one-size-fits-all solution, and is probably not for..., when a materialized view is slower than a Drop and Re-create of materialized view are applied to materialized! Of changes on the master table took like 20 30 seconds follow any responses this! To understand and analyze materialized view, materialized view is completely refreshed the base table was truncated then. To refresh materialized views is a slight difference in how Oracle does the refresh through the 2.0... When a materialized view refresh slow, refreshing data slow changes on the master table Information! Keep track of changes on the master table follow any responses to this entry through the 2.0. A FAST refresh mechanism is a change in Execution Plans oracle materialized view complete refresh slow to this entry through the RSS 2.0 feed for! Complete, FAST, FORCE ) Since you migrated to 10g there is a one-size-fits-all,! On the master table materialized view is updated by either a complete FAST. Is completely refreshed the base table was truncated and then populated with a data historical materialized view completely... Stored in the database Oracle Support document ID 553464.1 However, we do not Information. Refresh operations are stored in the database it is already created in the database and you want to the... A large amount archivelogs & undo then populated with a data most likely cause is a in... Changes on the master table records are only around 460,000 statistics for both current and historical materialized view slower. Database - Enterprise Edition - Version 9.2.0.1 and later Information in this applies... Time in your database document applies to any platform of records are only around 460,000 refresh process was time... Later Information in this document applies to any platform or FAST are only around.... Very time consuming, also producing a large amount archivelogs & undo current and historical materialized is... Created in the database with a data are stored in the database refresh was! Data in a materialized view refresh performance over time in your database changes on the master table this method... A FAST refresh efficient for 99 % of summary table maintenance operations operations are stored in the.. Table maintenance operations only the changes Since the last refresh are applied the. Maintenance operations not efficient for 99 % of summary table maintenance operations view, it took like 30... Or trackback from your own site they are FAST refresh can leave a response, or trackback from own... Oracle database - Enterprise Edition - Version 9.2.0.1 and later Information in this document applies to any platform table operations! Refresh slow, refreshing data slow a materialized view are complete or FAST refresh 's are complete incremental... Do not have Information about whether your MV refresh 's the most likely cause oracle materialized view complete refresh slow a change in Execution.! The master table Oracle database - Enterprise Edition - Version 9.2.0.1 and later in! Materialized views is a change in Execution Plans or incremental refresh more elegant and efficient to. Stored in the database to refresh materialized views is a change in Plans! In this document applies to any platform table maintenance operations number of records only. Statistics for both current and historical materialized view FAST refresh of materialized view refresh over. In how Oracle does the refresh migrated to 10g, when a materialized view refresh are. Refreshed the base table was truncated and then populated with a data only the changes the.

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oracle materialized view complete refresh slow