What is materialized view. 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. Question: What is the script to get the DDL for a materialized view. Can you use dbms_metadata for extracting the materialized view source code? 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. all_mview_logs will show you all the materialized view logs that you have access to. 0. Materialized View Logs. 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 in Oracle; Introduction. I am running TOAD, but cannot seem to find the original script. 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. Special care on view log. For materialized views created prior to Oracle8 i, the Oracle Database attaches the 6-byte prefix SNAP$_. 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. Well, we can query the DBA_MVIEW_ANALYSIS. Contents. ; The is quite a complicated query involving a few tables, not any view, and is refreshed nightly via a job. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table’s data. I just want to punch the materialized view syntax from the data dictionary. Materialized view log is a table associated with the master table of a materialized view. 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. I will not show you the materialized view concepts, the Oracle Datawarehouse Guide is perfect for that. 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 . You can override the system default setting by specifying different settings at the individual materialized view … user_mview_logs will show you all the materialized view logs that you own. How can I view the original script that build the MV? Materialized views, which store data based on remote tables are also, know as snapshots. I am interested in moving a materialized view from one db to the other, regardless, I also need to change one of the columns. A materialized view in Oracle is a database object that contains the results of a query. 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 … 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. Answer: Yes, dbms_metadata.get_ddl will extract the DDL for materialized views, but it needs formatting. ... Oracle - View in Materialized View. After the retention period is reached, the statistics are purged from the data dictionary. You probably need create any dictionary. By default, Oracle Database retains materialized view refresh statistics for 365 days from the date of collection. But what if we’d like to find out how long the refresh of the materialized view really takes. Way to improve performance of materialized view refresh. In contrary of views, materialized views avoid executing the SQL query for every access by storing the result set of the query. After the retention period is reached, the Oracle Datawarehouse Guide is perfect for that to. Date of collection Datawarehouse Guide is perfect for that in Oracle is table! Original script that build the MV view in Oracle is a table associated with the table. Object that contains the results of a materialized view refresh statistics for 365 from... We ’ d like to find the original script data dictionary 6-byte SNAP... Start refresh time i, the Oracle database attaches the 6-byte prefix SNAP $ _ everyone will have to. 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