Then applying the changes to the MV. By default, the material view log is preserved. Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on … All columns that are used in the query must be added to the materialized view log. ]table; “But her friend is nowhere to be seen Now she walks through her sunken dream To the seat with the clearest view...” ~ David Bowie (life on Mars) Related Oracle Commands: A materialized view ON PREBUILT TABLE can be used on tables of all sizes; however, you're likely to see the most benefit from its use on larger tables where the time impact of a regular drop and rebuild of the materialized view could be on the order of magnitude of hours or days. Handlung: No action required. A master table can have only one materialized view log defined on it. SQL> DROP MATERIALIZED VIEW mv_sales; Materialized view dropped. If a materialized view group was created with a deployment template, then, before you drop the materialized view group at the remote materialized view site, you need to execute the DROP_SITE_INSTANTIATION procedure at the target master site of the materialized view group. A materialized view log is located in the master database in the same schema as the master table. drop materialized viewは既存のマテリアライズドビューを削除します。このコマンドを実行するためにはマテリアライズドビューの所有者でなければなりません。 Articles Related Query Rewrite The end user queries the tables and views in the database. DROP MATERIALIZED VIEW LOG. Datenbank: 12c 1 Fehlercode: ORA-32417 Beschreibung: must use DROP MATERIALIZED VIEW LOG to drop "string". 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. We are using Oracle9i Enterpr What is the procedure to fix this? 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. oracleデータベースでマテリアライズドビューを作成・リフレッシュ・変更・削除する方法をお探しではありませんか？ 本記事では、マテリアライズドビューを作成・リフレッシュ・変更・削除する方法を紹介しています。sqlサンプルもあるのでぜひ参考にしてください。 Action: No action required. 説明. If a fast refresh is attempted for such a materialized view after its master materialized view has performed a complete refresh, then Oracle returns the following error: ORA-12034 mview log is younger than last refresh USER_MVIEW_LOGS Lists the Name of the table where the changes to the master table or master materialized view are logged. A materialized view can query tables, views, and other materialized views. Now I want to only drop that materialized view layer and preserve the underlying table. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. I've been trying to DROP an MV which is defined as REFRESH ON DEMAND and there are no locks anywhere. 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. Re-creating the materialized view doesn't fix this (or manually refreshing it). But it IS a materialized view log table (as the exception told you) that was created to for another table to support a materialized view (MV) If you drop the log table then the MV won't be an MV anymore. This log information allows a fast refresh because the fast refresh only needs to apply the changes since the last fest refresh. nikos@NIKOSDB> drop materialized view mv_sales 2 / Materialized view dropped. The point to remember is Oracle is reading the materialized view log. I have an issue with dropping materialized views. CREATE MATERIALIZED VIEW LOG ON <> WITH ROWID SEQUENCE, EXCLUDING NEW VALUES;. I attempted to use PRESERVE TABLE clause from the information in this link, but it still deletes all the rows and returns only the template of the table after deleting the materialized view layer. Recently I had to drop a couple of large Materialized View. As a consequence, costly full refreshes would be required on many (potentially large) MViews, in turn causing delays in availability. SQL - Materialized View in Oracle. Most of the time is spent on select over m.view log for table2, which has no relations to refreshing m.view. There are no errors shown with the jobs that fast refresh these. I have a table with 600million rows. 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