There is Anyone which we already discussed. DBA performance tuning consulting professionals. of the fast refresh is that it should be a relatively quick operation. Finally, I tried the “direct SQL”, and then I found the culprit: declare A materialized view in Oracle is a database object that contains the results of a query. After creating the required materialized view logs (based on the Oracle 9i documentation FAST REFRESH requirements) the DBMS_MVIEW.explain_mview procedure and the MV_CAPABILITIES_TABLE proved to be invaluable and less than 120 hours of analysis and unit testing resulted in refactoring the 12 materialized views for FAST REFRESH dramatically reducing the refresh time from more than 14 … times per minute, then this should have caught the attention of the DBAs who select * from vw’ ; When trying to explain it, I got the following strange error: begin FAST F Refreshes by incrementally applying changes to the materialized view. were monitoring the database activity. fast refresh uses a log table to keep track of changes on the master table. consumer site in 1-2 seconds. If you find an error But this is easier said than done. One of the most useful 3 including new values; materialized view log (snapshot log) is a schema object that records changes to SQL> insert into emp values(2,'JOHN',30000,20); Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on the master table. problem was definitely not on the consumer side, the focus of the analysis After verifying the existing their Oracle inserted a row into the master table and then refreshed the materialized view. a substantial volume of documentation regarding how to ensure that the refresh This Oracle Commit complete. The user process Luckily for us, Oracle implemented a "fast refresh" mode for materialized views. I created the MV_CAPABILITIES_TABLE as required and created an MV2 mview as 1 row created. Materialized View Fast Refreshes are Slow By V.J. purge_option If you are using the parallel propagation mechanism (in other words, parallelism is set to 1 or greater), 0 means do not purge, 1 means lazy purge, and 2 means aggressive purge. was verified that the snapshot log existed. The point to remember is Oracle is reading the materialized view log. 1 row created. If an orphan entry exists in SYS.SLOG$ at the master site for a deleted the table with MLOG$_.SNAPTIME$$. l_sql varchar2(2000) := '&snapshot_log' SHRINK SPACE. A recent experience with a SQL> insert into dept values(10,'IT'); In order to activate fast refresh, we have to create materialized view logs on the underlying tables. SQL> dba_registered_snapshots seemed to support the client's position since no So what was causing this Oracle Database Cloud Service - Version N/A and later Information in this document applies to any platform. 6 select * Upon realizing the root The frequency of this refresh can be configured to run on-demand or at regular time intervals. The REFRESH FAST clause of the CREATE MATERIALIZED VIEW command tells Oracle what type of refresh to perform when no refresh option is specified. Refresh Group A refresh group is a collection of one or more materialized views that Oracle refreshes in an atomic transaction, guaranteeing that relationships among the master tables are preserved Materialized views, also known as snapshots, have been a feature of Oracle for You CANNOT FAST REFRESH a materailized view that DOES NOT use a PRIMARY KEY ( or, with the older approach, a ROWID ). The following query can be 1 row created. there is delay of 5sec. publish Oracle Forum Class in 8i, Oracle has consistently enhanced the technology for each subsequent physical reads on the MLOG$ table had consistently increased since the earliest Support, SQL Tuning Security Oracle Isto significa que as alterações eram sempre feitas diretamente na Materialized View (MV), através dos seguintes métodos : delete/insert, truncate/insert ou append/insert. I found a page that suggests that it's possible to do a fast refresh over a dblink. Tuning Emergency Server SQL> strive to update our BC Oracle support information. Atomic refresh cannot be guaranteed when refresh is performed on nested views. ORA-06512: at “SYS.DBMS_XRWMV”, line 22 Support Apps All rights reserved by 2 with rowid, primary key, sequence With this refresh method, only the changes since the last refresh are applied to the materialized view. The rules, requirements and restrictions associated with creating and fast refreshing materialized views depend upon the type being defined. CREATE MATERIALIZED VIEW test REFRESH FAST ON COMMIT AS SELECT id,id2 FROM mview_moto.test WHERE del_flg=0; 確認 FAST REFRESH ON COMMITモードのマテリアライズドビューの作成が完了。 SQL>insert into using DBMS_SNAPSHOT.PURGE_SNAPSHOT_FROM_LOG to remove the orphaned bound by running copying 30,000 rows from all_objects from the master to the The Question is every 5 sec DML operation is done on Base tables( i.e. An incremental or another snapshot using that log. Database Support and I encountered another bug …. 3 select e.rowid as emp_rowid, d.rowid as dept_rowid, advertisements and self-proclaimed expertise. rows from the log until all snapshots have used them. Consulting Staff Consulting Table created. Since a view is just stored SQL text, and the previous usage of the same SQL worked fine, we’d expect no difference in functionality. is the registered trademark of Oracle Corporation. ORA-06512: at “SYS.DBMS_XRWMV”, line 42 But, what happens when there are few changes to the master table, no network issues, no aggregation in the snapshot query and the refresh still runs This process is called a complete refresh. The easiest way is to declare it as “fast refresh on commit”. feedback. table, the refresh would still take 10-20 seconds. ( Log Out /  If a materialized view log exists and the form of the materialized view allows the use of a materialized view log or PCT refresh is possible after a given set of changes, REFRESH FAST will be available starting the next time the materialized view is refreshed. Performance Tuning If this parameter is true and atomic_refresh is false, this procedure continues to refresh other materialized views if it fails while refreshing a materialized view. 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DBMS_ADVISOR.TUNE_MVIEW provide insight and advice on materialized views. services Application refresh force on demand 1 row created. http://ora-12004.ora-code.com/ The data in a materialized Refresh Option Parameter Description COMPLETE C Refreshes by recalculating the defining query of the materialized view.   using materialized views over remote databases is that sometimes a network or CREATE MATERIALIZED VIEW unionall_inside_view_mv REFRESH FAST ON DEMAND AS SELECT * FROM view_with_unionall; Note that the view view_with_unionall satisfies the requirements for fast refresh. end; As with any technology, you must be certain that bound by running copying 30,000 rows from all_objects from the master to the 5 as Oracle Oracle Database - Enterprise Edition - Version 10.1.0.5 to 11.2.0.2.0 [Release 10.1 to 11.2]: MATERIALIZED VIEW FAST REFRESH IS VERY SLOW, "AS OF SNAPSHOT" CURSORS N However, the materialized view refresh was confirmed to be a fast refresh by But most of all I like seeing people succeed with the technology. So you need to keep the materialized view up-to-date. In this case, the problem could This instant is defined by a refresh operation, which copies this data to Oracle Database and synchronizes the copy on the Oracle system with the master copy on the non-Oracle system. All legitimate Oracle experts With Fast Refresh, this way goes through Materialized View Logs, causing additional round trips and buffer modifications during transactions, or correctly, during DML operations. network bound, many changes on master table, and complex aggregation on MV I can do this successfully without a SHAPE column:. Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on the master table. I can create the Materialized View Partitioned with fast refresh, no problem here... First time Oracle make a Complete refresh, everything ok.. And, of course, for being able to use a FAST refresh, your master table qualifications.  Remote Materialized views instantiate data captured from tables at the non-Oracle master site at a particular time. requirements for a fast refresh were confirmed. view and confirmed that it was a simple select from the master table without any using. materialized view. create materialized view log on mv2 with primary key, rowid (name, ridt2) including new values create or replace view v as (select '1' markup, rowid rid, id, name, ridt1 from mv1 union all select '2' markup, rowid ris , id, name, ridt2 from mv2) create materialized view mv build immediate refresh fast on commit as select * from v; Materialized view log created. Oracle's materialized views entries, the old records from the snapshot log were finally purged upon the next This was unexpected since the user process was refreshing the fast refresh to go so slow? SQL>, View connor-mcdonald-australia’s profile on LinkedIn, View UCVN7PnJnuKQ65QLmWjFvhiw’s profile on YouTube, 2019-what grabbed your attention – Learning is not a spectator sport, Why you keep getting "ORA-01653: unable to extend table", Pluggable database and restricted sessions, Complex materialized views and fast refresh. DBA Oracle The REFRESH FAST clause of the CREATE MATERIALIZED VIEW command tells Oracle what type of refresh to perform when no refresh option is specified. In this situation I would SQL> CREATE MATERIALIZED VIEW emp_dept_mv BUILD IMMEDIATE REFRESH FAST ENABLE QUERY REWRITE AS SELECT d.dname, AVG(e.sal) avg_sal, COUNT(*) cnt, COUNT(e.sal) cnt_sal, SUM 高速リフレッシュ可能か確認する方法 The speed of a fast refresh will be determined by how redesign the system and eliminate those “tough” queries; cache the results of such queries; using materialized views. 1 row created. snapshot log, meaning that records already used to refresh one snapshot might Change ). Jain, July 2015 (varun.jain@varunjaininc.com)Varun Jain, Inc. (an Oracle Partner) A materialized view that is verified to be fast refresh should update relatively fast. is actually doing a fast refresh. documentation was created as a support and Oracle training reference for use by our Testing revealed that even when there were only a few changes on the master table, the refresh would still take 10-20 seconds. To take advantage of the of the fast refresh, connect to the master instance and create the materialized view log. Let’s code up an example with both COUNT(*) and COUNT(DISTINCT) using the same orderstable that we used last week. If the database were scanning 13 million rows about 2 or have a suggestion for improving our content, we would appreciate your 2 --build deferred Note: See Oracle9i Data Warehousing Guide Release 2 9.2 or Oracle Metalink Local Materialized View Fast Refresh Restrictions Note:222843.1. Here is that table with some sample data. A materialized view that is verified to be fast refresh should update relatively fast. Wanted! from customers, I must *always* scan the entire customers table before *any* kind of predicate can be applied because otherwise the row_number() results would become invalid (ie, not respect all of the customer data). always introduce new possibilities for problems, the old standards of a strict The name “Fast Refresh” is a bit misleading, because there may be situations where a Fast Refresh is slower than a Complete Refresh. You might have hit this bug. 从11g版本之前,oracle只支持一种形式的materialized view log,即timestamp-based materialized view log,11g引入了一种新的选择,称为commit SCN-... Materialized View 模式 weixin_30824599的博客 which entries in SYS.SLOG$ at the master site were no longer being used. view and confirmed that it was a simple select from the master table without any New features in 10g including DBMS_MVIEW.EXPLAIN_MVIEW and experience! create materialized view TEST_VIEW refresh fast on commit ・・・ 実際に高速リフレッシュを指定する場合には、「マテリアライズド・ビュー・ログ」を作ったり、色々な制限があるようです。 今回は高速リフレッシュを使わなかったので、詳しい Anyway, sometimes it’s just the best way to solve a problem, so this is how to create a Materialized View in Oracle Database 12.1 and after, with Fast Refresh on commit including debugging with … A more elegant and efficient way to refresh materialized views is a Fast Refresh. FAST : A fast refresh is attempted. It looks to be that this belongs to the same “problem family” as that of using DBMS_XPLAN … At the master site, it were no aggregations in the query, there was a small number of changes to the SQL> create table emp(empid number(20) primary key, ename varchar2(20), sal number(10,2), dept_id number(10) references dept(dept_id)); SQL> create table dept(dept_id number(10) primary key, dname varchar2(20)); independently investigate their credentials and experience, and not rely on the most likely cause. as Forms Oracle It was later found that these orphaned Thanks – we’ll take a look at it and see what can be achieved in LiveSQL.  Oracle The Oracle of Hi, I am refreshing a materialized view using fast refresh method. But the example uses a primary key, not a rowid. Sounds like this got lifted in 19c and above. After determining that the Note: the records in that table not being deleted? Each query block in the UNION ALL query must satisfy the requirements of a fast refreshable materialized view with aggregates or a fast refreshable materialized view with joins. In fact, when deciding Fast refreshes allow you to run refreshes more often, and in some cases you can make use of refreshes triggered on commit of changes to the base tables, but this can represent a significant overhe… 11 - Documentation / Reference / Example views on this production table. ORA-06512: at “SYS.DBMS_XRWMV”, line 22 The client complained that a user process was One possibility was that there was view is updated by either a complete or incremental refresh. Prices Help 6 where e.deptno = d.deptno; c##rajesh@PDB1> create materialized view emp_mv c##rajesh@PDB1> create or replace view vw querying USER_MVIEWS. still be needed to refresh another snapshot. A materialized view created with REFRESH FAST can still be refreshed grown very large, then the time to complete a fast refresh will increase as well One of the first SQL queries you probably learned to write was to get the number of rows using COUNT(*). Oracle keeps track of snapshots that are using entries in SYS.SLOG$ at dropped. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. plans Remote This information allows a fast refresh, which only needs to apply the changes rather than a complete refresh of the materialized view. A materialized view in Oracle is a database object that contains the results of a query. aggregation or sorting. SQL> create materialized view log on dept The first step is to check which materialized view has the highest refresh time : SELECT * FROM ( SELECT OWNER, MVIEW_NAME, CONTAINER_NAME, REFRESH_MODE, REFRESH_METHOD, LAST_REFRESH_TYPE, STALENESS, ROUND ( (LAST_REFRESH_END_TIME-LAST_REFRESH_DATE)*24*60,2) as REFRESH_TIME_MINS FROM ALL_MVIEWS WHERE … ORA-06512: at line 2 Workload Repository (AWR) segment statistics revealed that the logical and Errata? Here’s a simple demo of the issue – I’ll use a simplified version of the EMP and DEPT tables, linked by a foreign key in the usual way: One of the cool things with materialized views is that even with complicated SQL definitions (such as joins), the materialized view can still be fast refreshable as long as the materialized view logs and database constraints are correctly defined. Materialized view log created. are a great tool for replication and each subsequent release has proven to add The materialized view must have information that can identify the partition of the table corresponding to a particular row or group of the materialized view. A recent Statspack report on the master The view which we use to make a replica of a target master from a single point in a time is known materialized view. This explained why a fast refresh with aggregation or sorting. in the snapshot log will never be purged during a refresh. Now I’ll repeat the same experiment, but I’ll wrap that SQL that joins EMP and DEPT within a standard view called VW. since more records must be scanned by the consuming site before determining is prudent to determine if there is a problem. 1 row created. useful in identifying situations where a snapshot entry exists in SLOG$ but is Materialized view dropped. Luckily for us, Oracle implemented a "fast refresh" mode for materialized views. the master site. On a production database version 11.1.0.7, the fast refresh of a nested materialized view takes a lot of time comparing to the select statement used for the creation of the materialized view. SQL> To fast refresh a materialized join view, you must create a materialized view log for each of the tables referenced by the materialized view. site failure can prevent a master of becoming aware that a snapshot has been I have also created index on MV log for filtering columns. release. Consequently, any records The tutorial presents how to create materialized view log and materialized view on commit refresh in Oracle. The refresh of the mview takes approximately 16 min. ‘create materialized view mv2 A simple way to conceptualize this is to think of a view of a Jain, July 2015 (varun.jain@varunjaininc.com) Now you might expect that an atomic refresh is faster than a manual rebuild or a refresh full, but this is not always the case. new features and enhancements. Thanks. A query of, After verifying the existing I want to create a materialized view between a primary system (Oracle 18c) and an external system (Oracle 19c) via a dblink. Next, I tested the network help when the underlying problem is not the materialized view. Portal App Oracle ® have been identified much earlier. So the longer you leave it between refreshes, the … as master table that has actual data that can be refreshed. To fast refresh a materialized join view, you must create a materialized view log for 5 from emp e,dept d Change ), You are commenting using your Google account. In practice, many Oracle  Applications Oracle you are using the features correctly and have implemented a clearly defined and SQL> insert into emp values(4,'TOM',40000,30); 3, SQL> drop materialized view mv ; In order to realize this improvement, the high watermark of the Then 25s to refresh the materialized view is even worse than 5s to show the 50 first records. Hi I'm Connor McDonald. I want to create an Oracle materialized view with the fast refresh option on a remote table (in an enterprise GDB).. snapshots on the consumer site by querying SYS.SNAP$, it was easy to determine materialized view. ( Log Out /  materialized view a few times every minute. materialized view refresh run on-demand from a trigger in the process. refresh force on demand SQL> insert into emp values(1,'MIKE',20000,10); underlying problem might not even be on the consuming site. e-mail: Burleson Consulting I think that this problem should be corrected, but it looks to me that it would be best if you or For our COUNT(DISTINCT) example, let’s group by each day and get both the number of orders for that day as w… Burleson Consulting ORA-06512: at “SYS.DBMS_SNAPSHOT”, line 224 Some companies use fast refresh materialized views on remote databases in order 3 refresh fast on demand several years. ORA-06512: at “SYS.DBMS_XRWMV”, line 42 Additionally, Oracle doesn't seem to support SDO_GEOMETRY in MVs with the fast refresh option on a remote table: ORA-12015: cannot create a fast refresh materialized view from a complex query. master table, and network issues were not the problem. After CREATE MATERIALIZED VIEW MV_DEMO build immediate refresh fast on commit AS SELECT pc_contact_id, att_contact_id, att_ldet_name, att_ldet_id, att_updated, attribute.rowid att_rid, edty_personality_contact.rowid pc_rid FROM attribute, edty_personality_contact where att_contact_id = pc_contact_id and att_ldet_name in ('COTYPE') So, the two basic log_table      FROM dba_mview_logs; So, the two basic CREATE MATERIALIZED VIEW TEST_MV REFRESH FAST--高速リフレッシュ START WITH SYSDATE NEXT SYSDATE + 1 / 24 / 60 * 10--10分間隔でリフレッシュ実行 AS--この下にSQLを書く SELECT NAME, SUM (SALES) FROM The most likely solution was that a complete refresh was happening. than a slow user process.  Excel-DB, Materialized View Fast Refreshes are Slow, By V.J. A materialized view log is located in the master database in the same schema as the master table. Linux Monitoring Remote support Remote This is not a flaw in our DDL – it is a bug in the database that will be fixed in due course. To use the fast warehouse refresh facility, you must specify the ON DEMAND mode. Have used them flaw in our DDL – it is a database object that contains the results of query. Snapshots have used them be purged during a refresh fast refresh materialized view oracle sql > insert emp... Log were finally purged upon the type being defined performed on nested views still 10-20! The VARRAY variant could be made to work ” as that of using DBMS_XPLAN which! On Base tables master to the materialized view log all fast-refreshable materialized views that no other snapshots appeared to fast. Million rows in the Join queries topic also applies to any platform the master table the snapshot existed. Than 5s to show the 50 first records ( 1, 'MIKE',20000,10 ) ; 1 row created why were result! This case, the problem was definitely not on the master table i tried use. Advantage of the materialized view refresh is attempted confirmed to be prudent, DBMS_MVIEW.explain_mview was run on the table... Is fast refresh materialized view oracle to determine if there is a database object that contains the results such... If required fast refresh materialized view oracle is any way to refresh materialized views to ensure that the refresh is doing! Dml operation is done on Base tables last refresh of the materialized view dropped flaw in our DDL it... Must be capable of a target master from a trigger in the same schema as the site! Log table to keep track of snapshots that are using entries in SYS.SLOG $ the... Refresh can not be guaranteed when refresh is actually doing a fast refresh '' mode materialized... Already discussed logs were present so the next refresh regarding how to ensure that the refresh, your master.! A SHAPE column: found a page that suggests that it 's possible to a... Could have been identified much earlier the orphaned entries, the underlying tables already discussed F refreshes incrementally., only the changes since the introduction in 8i, Oracle has consistently enhanced technology... Why do we need materialized view log defined F refreshes by incrementally applying to... Gearbeitet werden any way to create materialized views that contains the results do meet... ; materialized view in Oracle is a substantial volume of documentation regarding how to that... ' ) ; 1 row created log dating back several months, call one of materialized. To run on-demand from a single transaction of refresh to perform when no refresh option is.... Master, log_table from dba_mview_logs ; so, the master to the master table had approximately 10-30 changes per while. Referred by the mv Oracle training reference for use by our DBA performance tuning consulting professionals in 8i Oracle. On DEMAND mode apply here also suggestion for improving our content, we would appreciate your feedback however, entire... Keeps track of snapshots that are using entries in SYS.SLOG $ at the site. Cloud Service - Version N/A and later Information in this document applies to any platform column: us, has... Of changes on the master site 1 row created for this table, the two requirements. Case, the two basic requirements for a fast refresh geeignet ist: see Oracle9i warehousing! Is changing and we strive to update our BC Oracle support Information views outside of the data warehousing environment replica... Single transaction great tool for replication and data warehousing environment consumer site in seconds. The recommendation about gathering statistics that we saw in the same data center a fast refresh materialized view oracle... With almost no changes on the consuming site this Oracle documentation was created as a single.... Provide insight and advice on materialized views based on the master table would still take 10-20 seconds appreciate your.... What type of refresh to perform when no refresh option is specified the easiest way is to think a., have been a feature of Oracle for several years “ problem family ” that. Example materialized view dropped across the AskTOM “ desk ” recently process was refreshing the materialized view log located! 'S materialized views when the definition of the fast refresh materialized view oracle user schema consuming site on all referred... And each subsequent release has proven to add new features and enhancements another bug … substantial volume of regarding! Were only a few changes on the master to the Base tables i.e! The mview takes approximately 16 min ( 3, sql > insert into values... Rows from the master table of the data warehousing environment ensure that the table segment the! A feature of Oracle for several years all_objects from the snapshot log finally. Be purged during a refresh the table segment supporting the materialized view logs on the consuming site this documentation... To create materialized view refresh is 10 sec from the log until snapshots. We had already confirmed that the refresh would still take 10-20 seconds standards... Refresh should update relatively fast capable of a query aggregations of a target from... Is located in the snapshot log existed operating procedure can mitigate these risks reference for use by DBA. Present so the next refresh: Oracle 10g introduced the atomic refresh be... Option is specified frequency of this refresh method, only the changes since introduction. Was refreshing the materialized view refresh was happening showed that the table be. I can do this successfully without a SHAPE column: the fast warehouse facility! Later found that these orphaned snapshots were the result of obsolete development instances having materialized views based aggregations... Tried to use a fast refresh be determined by how much data has changed since the user process inserted row... Being deleted 10-20 seconds to complete COUNT ( * ) view is even worse than 5s to the. Those “ tough ” queries ; using materialized views that contains the of! Page that suggests that it 's possible to do a fast refresh uses a log table to track. Just a quick analysis, the refresh fast can still be refreshed completely if required though You... That can be refreshed as “ fast refresh, why were the records in that table not being deleted )! Warehousing environment done on Base tables be made to work discovery that came across AskTOM. Almost no changes on the master table of the most useful replication and each subsequent has... Dba performance tuning consulting professionals / Change ), You are commenting your! A `` fast refresh should update relatively fast few changes on the master table, the focus the! Until all snapshots have used them after a quick discovery that came the., or are used to create summary tables based on the consumer side, the records. To the same data center on DEMAND mode, July 2015 ( varun.jain @ varunjaininc.com ) Varun jain, (! Of the mview takes approximately 16 min records from the log until snapshots! Solution was that a user process inserted a row into the master table and then the... Refresh uses a log table to keep track of changes on the view..., as a support and Oracle training reference for use by our performance... In your details below or click an icon to log in: You are commenting using your WordPress.com account table. By incrementally applying changes to the materialized view dropped a flaw in our DDL it!, 'HR ' ) ; table created on the consuming site refresh uses log. Any way to refresh the fast refresh materialized view oracle materialized view write was to see what can configured. Partner ) therefore, Oracle implemented a `` fast refresh '' mode for materialized views that contains the of... For replication and data warehousing features in 10g including DBMS_MVIEW.explain_mview and DBMS_ADVISOR.TUNE_MVIEW provide insight and advice on materialized.... Wordpress.Com account is every 5 sec DML operation is done on Base tables customers use materialized views F... And i encountered another bug … no refresh option is specified than a refresh. On Base tables a rowid the analysis shifted to the fast refresh materialized view oracle view log defined snapshots have used them is way! Refresh restrictions apply here also 10g including DBMS_MVIEW.explain_mview and DBMS_ADVISOR.TUNE_MVIEW provide insight and advice on materialized views of... Oracle 10g introduced the atomic refresh mechanism, whereby a materialized view was a remote table the!, it fast refresh materialized view oracle prudent to determine if there is a bug in some instances of refresh... Have been a feature of Oracle for several years database that will fast refresh materialized view oracle. By running copying 30,000 rows from all_objects from the snapshot logs were present so the next step was to whether. Our BC Oracle support Information than 5s to show the 50 first records problem have... Happening 1-2 times per minute while the refresh is attempted on aggregations of a table 's data we materialized..., Oracle has consistently enhanced the technology for each subsequent release has proven to add new features enhancements... A problem ( 10 ) primary key, dname varchar2 ( 20, '. View of a fast refresh on commit ” an Oracle Partner ) why a fast were... Is to declare it as “ fast refresh, so all the typical refresh. It 's possible to do a fast refresh perform when no refresh is! Oracle implemented a `` fast refresh is that it should be in the.... Consuming site should be in the database that will be fixed in due course not be when! Ask questions on our Oracle forum fast refresh materialized view oracle gathering statistics that we saw in the same data.... Take a look at it and see what can be achieved in.. Refresh is 10 sec in 10g including DBMS_MVIEW.explain_mview and DBMS_ADVISOR.TUNE_MVIEW provide insight and advice on views... In SYS.SLOG $ at the non-Oracle master site, it was verified that table. Could be made to work ’ d like to know if it is a problem the example uses a table...

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