UpgradesSQL Learn how your comment data is processed. Performance Tuning But I cant think of an example. With each Quarterly Release Update (Update) or Release Update Revision (Revision), the maximum value increment increases to the most recent update or revision. Oracle forum. Bugs: i.e. Those are derived from the value of OPTIMIZER_FEATURES_ENABLE. 2. The ALTER DATABASE RESET COMPATIBILITY command does not exist anymore for over a decade. But you should be prepared in my opinion. A very common misunderstanding happens when COMPATIBLE gets mixed with the Oracle optimizer. Losing data was not an option of course. Please check with Oracle Support. experience! They went live. LinuxMonitoringRemote supportRemote Compatible parameter is there to allow a downgrade in case we encounter an optimizer bug.
Were hitting a couple bugs in our upgrade testing. Performance Tuning, Oracle And yes, my recommendation stays unless your entire environment is fully on 19.10.0 leave COMPATIBLE on the default. But your database will behave as it did before.
This can be even used on the fly without impacting the downgrade at all.
We saw that for example already happening with the feature SQL Macros which got backported as of Release Update 19.6.0, however until now we did not had to touch the parameter compatible in order to make use of it. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Oracle COMPATIBLE VS OPTIMIZER_FEATURES_ENABLE, oracle compatible vs optimizer_feature_enable, oracle optimizer_feature_enable parameter, Step By Step Oracle 19C RAC Installation on Oracle Linux 7.9 Part-1 OS. Mike, FormsOracle I agree with the others who suggest full testing with both settings as they are in effect 2 different versions of the database. A really good article here. And actually, the database downgrade is the by far most simple way to go back a few days after you upgraded. So how to tell the DB to downgrade to 18.3 and not to 12.1? Support, SQL TuningSecurityOracle 911RAC Your email address will not be published. Startup up database with STARTUP DOWNGRADE in the 19c home. If you change it as part of the upgrade, you wont be able to downgrade anymore. And in reply to my previous blog post about whether you need to change COMPATIBLE when you apply an RU, I received the following question: When and how should you change COMPATIBLE? At first, you can only set it to a higher value. However, the compatible setting introduces new features. Once it has been completed, start the database with STARTUP UPGRADE in the 18c home. But please, if you know more, shed some light. RSS Feed for Upgrade your Database NOW! Before upgrading to Oracle Database 19c, you must set the COMPATIBLE initialization parameter to at least 11.2.0, which is the minimum setting for Oracle Database 19c. And neither does the DBUA. I doubt that COMPATIBLE does effect the case where you hit bugs unless you pick on a new feature which is depending on COMPATIBLE. How to Grant Developers Access to Dynamic Performance Views in OracleDatabase? I guess the change in the parameter compatible is needed because Blockchain tables writes data formats or structures to disk which are not compatible with an earlier 19c RU. 
alter system set COMPATIBLE=19.3.0 Not their fault of course but if theyd tested with a real data set, they would have found it during testing already. I suppose it should have been Addition Jan 29, 2021 (unless you have a crystal ball ofcourse ;-)). The following table lists the default, minimum, and maximum values for COMPATIBLE in Oracle Database 19c, and in each release supported for upgrading to Oracle Database 19c: Table 1-1 The COMPATIBLE Initialization Parameter. And not what I was looking for. where name like 'comp%'; You can buy it direct from the publisher for 30%-off and get instant Wanted! JDBC Driver jars and zips are missing in $ORACLE_HOME/jdbc/lib directory .. simplefan.jar What is the Difference Between the v$sql*Views? I value the ability for a seamless fallback way more than a hypothetical option that something can go wrong or different because of COMPATIBLE. Id rather support a multi-option recommendation like this: Deitir), Twitter hesabnz kullanarak yorum yapyorsunuz. Oracle OCE Performance Tuning 11g & 12c
This is not the case in every project.
PortalApp Hi Mike, I have a question that is excruciating me.
Those are derived from the value of OPTIMIZER_FEATURES_ENABLE. If you try it, you will get: Selecting Local Undo and <12.2 COMPATIBLE. ORA-39021: Database compatibility version 19.10.0.0.0 is not supported. But I have my honest doubts that youll have any impact in testing. Use the original 19.0.0 patch. Yes, others have raised this point as well. And one more question about COMPATIBLE. e-mail: Burleson Consulting We are working on something like that for the next releases. Here Burleson ApplicationsOracle As you said, the changes that compatible parameter makes is NOT documented, we do not know what will happen, how do we know we will not hit a bug. independently investigate their credentials and experience, and not rely on The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user. Step By Step Oracle 19c Data Guard Installation on Oracle Linux 7.9, Step By Step Oracle 19C RAC Installation on Oracle Linux 7.9 Part-3 DATABASE. was: When should you change COMPATIBLE?, And our usual answer is: Change it 7-10 days after the upgrade IF you will get additional downtime.. easy between instances on different sub releases using compatible=10.2. But if you try to find more information what it really does, you wont be very happy. You can also do it using DBCA with silent mode, however, you will need to create a customized template before starting. And the control file version there is 19.0.0.0, so there is no chance to select a template with pre-built data files and control files and also define the COMPATIBLE parameter. Oracle PostersOracle Books C) For less critical databases (ones that can tolerate some crashes and some downtime) Id apply your recommendation: 7-10 days with lower COMPATIBLE setting after the upgrade, and the testing could be done on the higher COMPATIBLE setting alone. The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. B) Do the whole testing twice, once with the upgraded DB and lower COMPATIBLE setting and the other time with the upgraded DB and the upgraded COMPATIBLE setting, then live with the lower COMPATIBLE setting after the upgrade long enough to see that all types of workloads (i.e. The COMPATIBLE initialization parameter enables or disables Oracle Database features based on release compatibility.The COMPATIBLE initialization parameter operates in the following way: Checking the Compatibility Level of Oracle Database. Hence, once changed, you are not able to revert to the previous value. Opened a case for clarification, for obvious reasons. And you cant have different COMPATIBLE settings on different instances in a RAC environment. advertisements and self-proclaimed expertise. All rights reserved by ERROR at line 1:
parameter, enter: Select name,value from v$parameter parameter important? But you will miss a lot of cool features. And the Database Upgrade guide gives you even more insights. There is patch 30828205 that you can apply to remove the expdp compatibility restriction, and its been produced for 19.0.0, 19.4.0, 19.9.0. Aaya bilgilerinizi girin veya oturum amak iin bir simgeye tklayn: WordPress.com hesabnz kullanarak yorum yapyorsunuz. We use cookies to optimize our website and our service. Answer: Yes, the number of digits is Guaranteed Restore Points are your database life insurance for issues happening during an upgrade, the database downgrade is your insurance for issues happening after the upgrade. FAIL => Database parameter COMPATIBLE should be set to recommended value considering using the services of an Oracle support expert should ojdbc8dms_g.jar . As these views get adjusted during the database upgrade, COMPATIBLE wont have any effect on it. This Oracle Therefore when the compatible value is set, an index rebuild will create a different type of index. However, when you create a 19c database (no matter the RU), the COMPATIBLE will default to '19.0.0'. It was created from the "Custom Template". Leave COMPATIBLE as it is. But honestly, I found a lot of things. UPDATE DML Almost Twice as Slow for ROW STORE COMPRESS ADVANCED Table in 12.2 after Changing COMPATIBLE Parameter from 11.2.0.4 To 12.2.0.1 (Doc ID 2604718.1), 2. How to Add and Drop Disks to ASM Disk Group in Oracle 19c? (not serverout as this does not work in this stage)
is the registered trademark of Oracle Corporation. You should set the Indeed, I read results from the community pages where people had exactly this question: Which features depend on COMPATIBLE? Can you give an example of the kind of scenario where a downgrade would need to be performed? I will release a blog post this week about it . And in the database, you may have now access to new features such as the online move of data files, etc.COMPATIBLE is also used to determine how your database acts to the outside, i.e. Thank you for the explanation! But this is clearly our fault as these changes are not documented . Added 3 bug for compatible changes might happen in 19c. DBA - Rodrigo Jorge - Oracle Tips and Guides, Blog about Databases, Security and High Availability. I see your point and it would be easier if we would document all embedded changes Support. why shouldnt you be able to restore a backup you have taken before an upgrade or before a COMPATIBLE change anymore? But Id guess you dont mean that. I have encountered the 2 & 3. how it interacts with an application. We are planning to upgrade our database(v12.2.0 with compatible 11.2.0) to 19c. Required fields are marked *. The COMPATIBLE initialization parameter enables or disables the use of features, to help protect your existing application use of data. Hence, the 7-10 days are an estimate based on experience. For 18c Update 3, at the time of its initial release, the maximum value is 18.3.0. It usually is even faster than the database upgrade as we dont need to remove everything from an upgraded database. When you use dictionary views in your application, you should make sure that this doesnt raise an error. With the recent announcements that the feature Blockchain tables got backported to 19c as of RU 19.10.0, it is good to see that you already made a clear statement with an addition to this blogpost regarding your view on the mandatory change needed for the parameter compatible in order to be able to make use of it. how it interacts with an application. The Oracle of database upgrade but with lower COMPATIBLE setting versus database upgraded with higher COMPATIBLE setting. You cant adjust COMPATIBLE while the database is up and running.
Those days, I was trying to create a 19c database with a lower COMPATIBLE, so I could have a fallback plan after plugin a PDB from a lower release. Scripts Hi, does it means that all desupported features of Oracle19C will be available? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Bug 32290445 : CN: ORA-00600: [6856], [0], [2] WHILE RECOVERING TRANSACTION AGAIN OLTP COMPRESSION, 3. But still, where is the list which features depend exactly on COMPATIBLE? But the Oracle database code is a complex thing. Going deeper here, as far as I know, no matter how you set COMPATIBLE, the underscores and parameters, as long as they are not bound to a feature which depends on COMPATIBLE directly, will change as well just with the new executable. The default is 3 number, for instance 19.0.0. This allows you to move from 19.X to 19.Y, for any possible X and Y. qualifications. During and after a database upgrade, we dont change COMPATIBLE. feedback. Or the new AutoUpgrade. The biggest issue or change usually is the SQL Net client protocol in such cases. Once it has completed, start the database. The Oracle of
This is why we recommend to leave it at the default. access to the code depot of Oracle tuning scripts. But dont use the later versions, as they can only be applied to that specific release. Patch 30828205 has been rolled into 19.11 (and above) as a permanent fix. Database Support Can I keep compatible set to 10.2.0 for all releases of feature is incompatible with database version. Selecting CDB model and <12.1 COMPATIBLE (containers didn't even exist before 12c). Testing in new compatible in UAT env and immediately advance it in PRD after upgraded. Just to make it clear my use case ( one of ) And technically, there is no difference except for the fact that the database and its tools react to settings such as 19.4.0 or 19.5.0. Then invoke catdwgrd.sql. But as you deploy a fresh database or upgrade another one to 19c, all the things in 19c will happen such as the Multimedia and Streams API removal etc. 
