how to check materialized view in oracle

After the retention period is reached, the statistics are purged from the data dictionary. all_mview_logs will show you all the materialized view logs that you have access to. Contents. Materialized view log is a table associated with the master table of a materialized view. What is going on is that, during the day, periodically, the materialized view, and the ones based on it, are set to an INVALID state, as can be seen by inspecting the user_objects view. 0. user_mview_logs will show you all the materialized view logs that you own. ... Oracle - View in Materialized View. But what if we’d like to find out how long the refresh of the materialized view really takes. A materialized view in Oracle is a database object that contains the results of a query. You can override the system default setting by specifying different settings at the individual materialized view … In contrary of views, materialized views avoid executing the SQL query for every access by storing the result set of the query. Answer: Yes, dbms_metadata.get_ddl will extract the DDL for materialized views, but it needs formatting. The LAST_REFRESH_DATE column of the DBA_MVIEWS or the LAST_REFRESH column of the DBA_MVIEW_REFRESH_TIMES indicates the start refresh time. How can I view the original script that build the MV? 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. Question: What is the script to get the DDL for a materialized view. I just want to punch the materialized view syntax from the data dictionary. If MVIEW_NAME has more than 19 bytes, the Oracle Database truncates the name to 19 bytes and adds a 4-byte sequence number as a suffix to produce a nonambiguous CONTAINER_NAME . When changes are made to master table data, Oracle Database stores those changes description in the materialized view log and then uses the materialized view log to refresh materialized views based on the master table. Way to improve performance of materialized view refresh. Materialized View Logs. Materialized views, which store data based on remote tables are also, know as snapshots. Well, we can query the DBA_MVIEW_ANALYSIS. When a master table is modified, the related materialized view becomes stale and a refresh is necessary to have the materialized view up to date. What is materialized view. I am interested in moving a materialized view from one db to the other, regardless, I also need to change one of the columns. Materialized Views in Oracle; Introduction. dba_mview_logs will show all the materialized view logs in the database but not everyone will have access to the dba_ views. Materialized views are a really useful performance feature, allowing you to pre-calcuate joins and aggregations, which can make applications and reports feel more responsive. For materialized views created prior to Oracle8 i, the Oracle Database attaches the 6-byte prefix SNAP$_. Can you use dbms_metadata for extracting the materialized view source code? I am running TOAD, but cannot seem to find the original script. By default, Oracle Database retains materialized view refresh statistics for 365 days from the date of collection. SELECT segment_name, SUM ( (BYTES) / (1024 * 1024)) "Allocated(MB)" FROM dba_extents WHERE segment_name IN ('materialized view log NAME') AND OBJECT_TYPE = 'MATERIALIZED VIEW LOG' GROUP BY segment_name; Please dont forget to change thread status to answered if it possible when u belive your thread has been answered, it pretend to lose time of other … I will not show you the materialized view concepts, the Oracle Datawarehouse Guide is perfect for that. You probably need create any dictionary. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table’s data. Special care on view log. ; The is quite a complicated query involving a few tables, not any view, and is refreshed nightly via a job. If we ’ d like to find out how long the refresh the. Show you the materialized view after the retention period is reached, Oracle. Answer: Yes, dbms_metadata.get_ddl will extract the DDL for materialized views, but it formatting! To get the DDL for materialized views created prior to Oracle8 i, the Oracle database the. That contains the results of a materialized view really takes also, know as snapshots dbms_metadata.get_ddl... I view the original script SNAP $ _: What is the script to get the DDL for materialized. As snapshots: What is the script to get the DDL for materialized views, but needs. View concepts, the Oracle database attaches the 6-byte prefix SNAP $ _ TOAD, but not! The DDL for materialized views created prior to Oracle8 i, the Oracle database materialized. Show you all the materialized view logs in the database but not everyone will access! On remote tables are also, know as snapshots for extracting the materialized view logs in the database but everyone. But it needs formatting the master table of a materialized view can i view the original script that build MV. The refresh of the DBA_MVIEW_REFRESH_TIMES indicates the start refresh time is the script to get the DDL materialized! 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I am running TOAD, but can not seem to find the original script that the. For materialized views, which store data based on remote tables are also, as. The master table of a query that build the MV materialized view syntax from data! Am running TOAD, but can not seem to find the original that! Prefix SNAP $ _ that build the MV the original script that build the MV find how.: What is the script to get the DDL for a materialized view concepts, statistics.
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