oracle materialized view log data dictionary
For knowing the status of materialized view data, there is three types of view are available namely DBA_MVEIWS, ALL_MVIEWS, and USER_MVIEWS in the data dictionary. Whenever materialized view and base table data’s are synchronized then it is considered that materialized view has fresh data otherwise it has the stale data (out-of-date data). Answer: Yes, dbms_metadata.get_ddl will extract the DDL for materialized views, but it needs formatting. However, views are not included in this view - nor do they exist in the underlying sys.source$.To access the text of views, the user_views.text column can be used, but this is not exact because Oracle will re-write some parts of the query, for example it will do glob expansion. The MLOG$ table name is held in the DBA_MVIEW_LOGS view, but I can't find any reference to the RUPD$ table. or … You can use materialized views in data warehouses to increase the speed of queries on very large databases. Some of the statement fail, because I do not have all the privs in liveSQL. This process is called incremental or fast refresh. Answer: When a view is created the data dictionary view dba_views is populated with the SQL statement. The new data dictionary views [DBA|ALL|USER]_MVIEW_DETAIL_PARTITION and [DBA_MVIEW_DETAIL_SUBPARTITION provide detailed information as to the staleness of individual partitions of a partitioned materialized view. Action: Add new values to materialized view log using the ALTER MATERIALIZED VIEW LOG command. In Oracle, to retrieve the SQL used to create a Function, Package, etc, the user_source view can be queried. Materialized Views: Refresh Statistics History - How can I see data in user_mvref_stmt_stats Hi Masters,sorry for another question :-) and again a big, big thank You for Your hard work and the answers to our questions! Materialized Views in Oracle. Using materialized views against remote tables is the simplest way to achieve replication of data … last_refresh_date - date of the last refresh of the materialized view; compile_state - indicates validity of the materialized view (VALID/NEEDS_COMPILE/ERROR) Rows. Each of these views comes in up to four variants that have one of the prefixes USER_ , ALL_ , DBA_ and/or CDB_ : Queries to large databases often involve joins between tables, aggregations such as SUM, or both.These operations are expensive in … The Overflow Blog Podcast 297: All … do you know of plans to change it? The data dictionary of Oracle is stored in the SYS schema. Where in the Data Dictionary is the name of the RUPD$ table held ? List tables used by Materialized Views (MV dependencies) in Oracle database. This chapter lists the following data dictionary views, which provide information about materialized views and materialized view refresh groups. 1b. ... the value of mview_id must be looked up in the materialized view data dictionary views by the person who calls the procedure. Data dictionary tables can be mimicked instead of translated. "string" Cause: An attempt was made to drop materialized view log using a command other than DROP MATERIALIZED VIEW LOG. For example, a data dictionary stores information about both the logical and physical structure of the database. "string" does not have a materialized view log Cause: The fast refresh can not be performed because the master table does not contain a materialized view log. so my questions are. Provide consumers the ability to perform operations with different Oracle Database features through a web REST API that can be easily adopted. Each Oracle database has a data dictionary, which is a set of tables and views that serve as a reference about the database. A similar statement holds for other ALL_ and DBA_ views. Description: table "string". Action: Use the CREATE MATERIALIZED VIEW LOG command to create a materialized view log on the master table. Description: must use DROP MATERIALIZED VIEW LOG to drop "string". In Oracle, if you specify REFRESH FAST for a single-table aggregate Oracle materialized view, you must have created a materialized view log for the underlying table, or the refresh command will fail. get Details about USER_MVIEW_LOGS an Oracle Database version 12cR1 data dictionary view, columns, and other details related to USER_MVIEW_LOGS ORA_EXCEL Oracle PL/SQL to Excel XSLX API The most powerful PL/SQL Excel API in the World. and ORA-12054: cannot set the ON COMMIT refresh attribute for the materialized view and trying to put materialized logs on the SYS tables is not allowed either. The query rewrite mechanism in the Oracle server automatically rewrites the SQL query to use the summary tables. Synonyms A synonym is an alias for any table, view, materialized view, sequence, procedure, function, or package. But I think You can ignore them. I created a materilaized view with partitions and i need to add partitions dynamicaaly using stored procedure for that i need to check whther the partiions with the same name existing.where can i see the partition names for a materilaized view is there any table like "USER_TAB_PARTITIONS"?.if the same query exists in the forum This chapter lists the following data dictionary views, which provide information about materialized views and materialized view refresh groups. PL/SQL :: Dictionary For Materialized View Partitions Sep 2, 2012. Oracle database Data Dictionary Query Toolbox. 1. is there a reason all_views uses a LONG still in 11g? !Could You please have a look into my test case? A materialized view, or snapshot as they were previously known, is a table segment whose contents are periodically refreshed based on a query, either against a local or remote table. Browse other questions tagged oracle oracle-sqldeveloper data-warehouse materialized-views or ask your own question. Action: No action required. Query on Materialized View Logs 543007 Oct 31, 2006 11:53 AM We need a denormalised data step-up, we decided on implementing Materialized Views and started working on them. Moreover, materialized view can be created on an already existing table in your schema using on prebuilt table clause of the create materialized view statement - names should be the same. I just want to punch the materialized view syntax from the data dictionary. Special care on view log. ... Oracle Database Data Dictionary. Sql Access Advisor (a GUI tool for materialized view and index management) can recommend the creation of materialized views. The data in the base tables is not always stored in a user friendly way and Oracle provides a set of views that are supposed to make data dictionary querying easier. Question: What is the script to get the DDL for a materialized view. Hi, I am removing sal column from table tab_emp; i want to check whether any materialized view or view using this column by querying using data SQL - Materialized View in Oracle. If a data dictionary translation is not possible because the non-Oracle data source does not have the required information in its data dictionary, then Heterogeneous Services causes it to appear as if the data dictionary table is available, but the table contains no information. Just brief about feature: Starting 12.2 Oracle Database collects and stores statistics about materialized view refresh operations. Can you use dbms_metadata for extracting the materialized view source code? You may had to add WITH SEQUENCE to your log creation to cope with certain use as stated in Oracle documentation : Specify SEQUENCE to indicate that a sequence value providing additional ordering information should be recorded in the materialized view log. My past experience has been that materialized view and synonym dependencies are based on the object id in the data dictionary, not the object name, so if you rebuild a source table, view, or synonym, you have no choice to rebuild the materialized view as well even if everything has the same names. At runtime, Oracle looks-up this definition in the data dictionary and executes the SQL. To delete all rows in the materialized view log, indicate a high number of materialized views to disregard, as in this example: ... Oracle automatically calculates the default setting for optimal performance. Once the new data has been indexed Oracle will do some name-switching in the data dictionary (shades of exchange partition) to make the new version of the materialized view visible. Cause: Materialized view log on the indicated table does not have new values information. I want to display the view source from the data dictionary. ALL_ Views DBA_ Views ... Oracle Database Reference for more information about these views. To see all views in a database you must query DBA_MVIEWS or DBA_SNAPHOTS. The Need for Materialized Views. 26 Materialized View and Refresh Group Views. _Oracle Database 10gR2 Data Dictionary; _Oracle Database 11gR2 Data Dictionary; You need special privileges or roles to query this view like the system privilege SELECT ANY DICTIONARY or the role SELECT_CATALOG_ROLE. A materialized view log is a schema object that records changes to a master table's data so that a materialized view defined on the master table can be refreshed incrementally. Details about DBA_MVIEW_LOGS an Oracle Database version 11gr2 data dictionary view, columns, and other details related to DBA_MVIEW_LOGS ORA_EXCEL Oracle PL/SQL to Excel XSLX API The most powerful PL/SQL Excel API in the World. Articles Related Query Rewrite The end user queries the tables and views in the database. Materialized View Log: When DML changes are made to master table data, Oracle Database stores rows describing those changes in the materialized view log and then uses the materialized view log to refresh materialized views based on the master table. These statistics are accessible using data dictionary views. A materialized view is a query result that has been stored or "materialized" in advance as schema objects. Response; Get information on a specific materialized view log. 26 Materialized View and Refresh Group Views. Related Definitions: Materialized View Log: When DML changes are made to master table data, Oracle Database stores rows describing those changes in the materialized view log and then uses the materialized view log to refresh materialized views based on the master table.