As some of you have asked me privately -- don't be shy, post your comments :), what the h. does 360 degree database programming means? Well, 4 things that i will elaborate on in following posts: (1) the database functionality itself, (2) calling database functionality from within the database, (3) calling database functionality from outside (client, middle-tier, etc), and (4) calling external system/functionality from within the database.
28 comments:
Any tool(s) recommended to this approach?
Thanks for your comment.
I guess you are referring to IDEs. For (i) i.e., building user-defined database funtionality (using PL/SQL and /or Java), as well as (4) i.e., calling out external system from within the database you can use Oracle JDeveloper as well as third party IDEs that support the Oracle database. Alternatively, for Java only, you can use any Java and/or Eclipse-based IDE to build the functionaliy then upload in the database, using loadjava command-line. In my next posts I'll touch on tools for making database functionality known to SQL and other components (internally and externally).
For PL/SQL, i'd also recommend the Oracle SQL Developer (formerly RAPTOR).
Thank you.
Kuassi,
I just read your book "Oracle Database Programing with Java and Web Services". It's really an amazing book.
I have a question about Oracle RAC and JDBC FCF. My question is if I used RAC, then I don't need to configure the connection pool from the Application Server side, e.g. WebSphere. Is it correct?
Mike,
Thanks for your appreciation of the book. Yes, you might not need to use Websphere's connection pool if the Java components can manage the persistence itself (i.e., POJO, Servlet, JSP, Bean-managed persistence EJB, and so on) however, as soon as you need transactional service from the container, it'll fail. The real and complete solution is for WebSphere to recognize OracleDataSource.
For those who do not have the book (yet!)the following blog entry http://db360.blogspot.com/2007/01/is-your-java-application-failoverproof.html descibes JDBC suppport for RAC.
Kuassi
Kuassi,
With FCF enabled, what kinds of Oracle RAC failure senarios can be handled by FCF? At what senarios actions need to be taken from application tier?
Thanks,
Mike
Hi Mike,
I think the following blog entry responds to your questions: http://db360.blogspot.com/2007/01/is-your-java-application-failoverproof.html
Kuassi
Hi Kuassi,
I am testing with our DBA about enabling FCF. It works fine when we bring down the service. But we got a problem when bring down the instance. We get the following error, and FCF does not work this time. The DDBC driver we used is of version: 10.2.0.3.0. Do you have any idea what could be the problem?
Thanks a lot,
Mike
=========
Caused by:
java.sql.SQLException: OALL8 is in an inconsistent state
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208)
at oracle.jdbc.driver.T4C8Oall.marshal(T4C8Oall.java:352)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:202)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:799)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1039)
at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:839)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1132)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3285)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3329)
at org.hibernate.persister.entity.AbstractEntityPersister.getDatabaseSnapshot(AbstractEntityPersister.java:1021)
at org.hibernate.engine.StatefulPersistenceContext.getDatabaseSnapshot(StatefulPersistenceContext.java:233)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:189)
at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:512)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:80)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:495)
at org.springframework.orm.hibernate3.HibernateTemplate$16.doInHibernate(HibernateTemplate.java:684)
at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:367)
at org.springframework.orm.hibernate3.HibernateTemplate.saveOrUpdate(HibernateTemplate.java:681)
Mike,
"OALL8 is in an inconsistent state" is usually a bug in the driver itself (i.e, the state machine). An OALL8 related bug has been fixed in 10.1.0.4 and 10.2.0.3 but this is the first time we are hearing about RAC related OALL8. I am told that you need to file a TAR to help investigation.
Good Luck, Kuassi
Kuassi,
Thanks for your reply. I figured out the problem I mentioned in my last message. In my code, I did the retry only one time. That's why I got the OALL8 message. Somehow, there is a delay for the establishment of the reconnection. After I changed my code to keep retrying, and this time it works. And it turned out after retrying 16 times, the new connections were established to the second instance.
After solving that problem, we got a new one. That is the connection load balance didn't work as expected. We have two Oracle instances running in our RAC, and I have 10 connections. When I first started my app, all these 10 connections went to only one instance, not load balanced to two instances. We have the following property set up in the connection URL:
DESCRIPTION = (LOAD_BALANCE=on)
Is this the correct setting? When I google this settings, I found some people set the LOAD_BALANCE to "true", and some set it to "YES". Which one is correct?
Thanks,
Mike
Hi Mike,
Up to 10.1, we only offer connect-time load balancing, set
LOAD-BALANCING=On and in addition PREFER_LEAST_LOADED_NODE_[listener]=OFF
in 10.2 (both RDBMS and JDBC), we furnish Runtime Connection Load Balancing, using Workload Metrics. This is well documented in the book.
Good luck, Kuassi
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In my next posts I'll touch on tools for making database functionality known to SQL and other components (internally and externally).
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In my next posts I'll touch on tools for making database functionality known to SQL and other components (internally and externally).
Bean-managed persistence EJB, and so on) however, as soon as you need transactional service from the container, it'll fail. The real and complete solution is for WebSphere to recognize OracleDataSource.
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