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Data Warehousing Snippets | Just another Oracle technology blog

Just another Oracle technology blog. WHERE clause over database link. Posted by Piotr Hajkowski. Data warehouses quite often need to query remote data over database link. These types of queries may involve significant volume of data. When a data warehouse is loaded incrementally, then usually a fraction of the remote table is needed. So, it is natural to add a WHERE clause to the query. However, what shall we do if with a query, for example like this one:. Is getting a very disappointing plan like below:.

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Just another Oracle technology blog. WHERE clause over database link. Posted by Piotr Hajkowski. Data warehouses quite often need to query remote data over database link. These types of queries may involve significant volume of data. When a data warehouse is loaded incrementally, then usually a fraction of the remote table is needed. So, it is natural to add a WHERE clause to the query. However, what shall we do if with a query, for example like this one:. Is getting a very disappointing plan like below:.

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Data Warehousing Snippets | Just another Oracle technology blog | hajkowski.net Reviews

https://hajkowski.net

Just another Oracle technology blog. WHERE clause over database link. Posted by Piotr Hajkowski. Data warehouses quite often need to query remote data over database link. These types of queries may involve significant volume of data. When a data warehouse is loaded incrementally, then usually a fraction of the remote table is needed. So, it is natural to add a WHERE clause to the query. However, what shall we do if with a query, for example like this one:. Is getting a very disappointing plan like below:.

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Query rewrite | Data Warehousing Snippets

http://hajkowski.net/tag/query-rewrite

Just another Oracle technology blog. Materialized views for multi-level aggregated data. Posted by Piotr Hajkowski. Too many materialized views. Continue reading →. Posted in Materialized Views. WHERE clause over database link. ETL job flows tuning. Materialized views for multi-level aggregated data. Proudly powered by WordPress. Theme: Reddle by WordPress.com.

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Piotr Hajkowski | Data Warehousing Snippets

http://hajkowski.net/author/admin

Just another Oracle technology blog. WHERE clause over database link. Posted by Piotr Hajkowski. Data warehouses quite often need to query remote data over database link. These types of queries may involve significant volume of data. When a data warehouse is loaded incrementally, then usually a fraction of the remote table is needed. So, it is natural to add a WHERE clause to the query. However, what shall we do if with a query, for example like this one:. Is getting a very disappointing plan like below:.

3

ETL job flows tuning | Data Warehousing Snippets

http://hajkowski.net/2013/03/etl-jobs-flow-tuning

Just another Oracle technology blog. Materialized views for multi-level aggregated data. WHERE clause over database link →. ETL job flows tuning. Posted by Piotr Hajkowski. Most of data warehouses include some sort of ETL jobs to refresh its contents. Typically those jobs can be divided into two categories: jobs that need to be executed in a specific order and jobs that may run in parallel independently from each other. There are also other constraints involved that make the job flows more complex. If th...

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Performance tuning | Data Warehousing Snippets

http://hajkowski.net/tag/performance-tuning

Just another Oracle technology blog. ETL job flows tuning. Posted by Piotr Hajkowski. Most of data warehouses include some sort of ETL jobs to refresh its contents. Typically those jobs can be divided into two categories: jobs that need to be executed in a specific order and jobs that may run in parallel independently from each other. There are also other constraints involved that make the job flows more complex. Materialized views for multi-level aggregated data. Posted by Piotr Hajkowski.

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Materialized views for multi-level aggregated data | Data Warehousing Snippets

http://hajkowski.net/2012/05/materialized-views-for-multi-level-aggregated-data

Just another Oracle technology blog. ETL job flows tuning →. Materialized views for multi-level aggregated data. Posted by Piotr Hajkowski. Too many materialized views. My multidimensional model is based on the following 3 relational tables: Sales, Time and Product. One materialized view for all queries. For details). The use of GROUPING function will allow to distinguish rows of different groupings (level combinations). This could be a good query example using the CUBE extension:. PRODUCT ID ,. YEAR ID ,.

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Data Warehousing Snippets | Just another Oracle technology blog

Just another Oracle technology blog. WHERE clause over database link. Posted by Piotr Hajkowski. Data warehouses quite often need to query remote data over database link. These types of queries may involve significant volume of data. When a data warehouse is loaded incrementally, then usually a fraction of the remote table is needed. So, it is natural to add a WHERE clause to the query. However, what shall we do if with a query, for example like this one:. Is getting a very disappointing plan like below:.

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