Re: Oracle error ORA-00604: ?? SQL ?? 1 ???? ORA-01000
Hi Rick, Is my case description clear enough? Any suggestions? Regards, Yu Wang On Sat, Mar 8, 2014 at 3:36 PM, yu wang wangy...@gmail.com wrote: Hi Rick, I have two very big master/slave tale I made them equal-partitioned by time stamp columns. So when users query something from two tables, I separate the sql into a lot small sql for a lot of very small interval in a loop to expedite the Execution of the SQL. Then I got too many cursors opened error from Oracle. What I am trying to is getting a way to close the cursor explicitly after get its result list. Regards, Yu Wang On Fri, Mar 7, 2014 at 10:00 PM, Rick Curtis curti...@gmail.com wrote: You're going to have to give a better description of your scenario for us to help you. Thanks, Rick On Fri, Mar 7, 2014 at 3:37 AM, yu wang wangy...@gmail.com wrote: Hi Gurus, I have manager.createNativeQuery() in a loop eventually lead to Oracle error: ORA-00604 and ORA-01000, which means cursors open in the oracle exceed the maximum. My question is how can I close some cursors explicitly in a loop? I try manager.clear() but seems it does not work. We are using OpenJPA 1.2.3. Regards, Yu Wang -- *Rick Curtis*
Re: Oracle error ORA-00604: ?? SQL ?? 1 ???? ORA-01000
Actually I just want to find a OpenJpa equivalence to close() method of JDBC Statement class On Tue, Mar 11, 2014 at 5:56 PM, yu wang wangy...@gmail.com wrote: Hi Rick, Is my case description clear enough? Any suggestions? Regards, Yu Wang On Sat, Mar 8, 2014 at 3:36 PM, yu wang wangy...@gmail.com wrote: Hi Rick, I have two very big master/slave tale I made them equal-partitioned by time stamp columns. So when users query something from two tables, I separate the sql into a lot small sql for a lot of very small interval in a loop to expedite the Execution of the SQL. Then I got too many cursors opened error from Oracle. What I am trying to is getting a way to close the cursor explicitly after get its result list. Regards, Yu Wang On Fri, Mar 7, 2014 at 10:00 PM, Rick Curtis curti...@gmail.com wrote: You're going to have to give a better description of your scenario for us to help you. Thanks, Rick On Fri, Mar 7, 2014 at 3:37 AM, yu wang wangy...@gmail.com wrote: Hi Gurus, I have manager.createNativeQuery() in a loop eventually lead to Oracle error: ORA-00604 and ORA-01000, which means cursors open in the oracle exceed the maximum. My question is how can I close some cursors explicitly in a loop? I try manager.clear() but seems it does not work. We are using OpenJPA 1.2.3. Regards, Yu Wang -- *Rick Curtis*
Re: Oracle error ORA-00604: ?? SQL ?? 1 ???? ORA-01000
No, your question still isn't very clear. Actually I just want to find a OpenJpa equivalence to close() method of JDBC Statement class I believe that after OpenJPA is done processing a native query we will close the statement. If that isn't happening, you could try to cast your query to an OpenJPAQuery and call .closeAll() on it once you are done using it. Hope this helps. Rick On Tue, Mar 11, 2014 at 5:21 AM, yu wang wangy...@gmail.com wrote: Actually I just want to find a OpenJpa equivalence to close() method of JDBC Statement class On Tue, Mar 11, 2014 at 5:56 PM, yu wang wangy...@gmail.com wrote: Hi Rick, Is my case description clear enough? Any suggestions? Regards, Yu Wang On Sat, Mar 8, 2014 at 3:36 PM, yu wang wangy...@gmail.com wrote: Hi Rick, I have two very big master/slave tale I made them equal-partitioned by time stamp columns. So when users query something from two tables, I separate the sql into a lot small sql for a lot of very small interval in a loop to expedite the Execution of the SQL. Then I got too many cursors opened error from Oracle. What I am trying to is getting a way to close the cursor explicitly after get its result list. Regards, Yu Wang On Fri, Mar 7, 2014 at 10:00 PM, Rick Curtis curti...@gmail.com wrote: You're going to have to give a better description of your scenario for us to help you. Thanks, Rick On Fri, Mar 7, 2014 at 3:37 AM, yu wang wangy...@gmail.com wrote: Hi Gurus, I have manager.createNativeQuery() in a loop eventually lead to Oracle error: ORA-00604 and ORA-01000, which means cursors open in the oracle exceed the maximum. My question is how can I close some cursors explicitly in a loop? I try manager.clear() but seems it does not work. We are using OpenJPA 1.2.3. Regards, Yu Wang -- *Rick Curtis* -- *Rick Curtis*
Re: Utilizing a slice for online migration
Todd - Does anyone have any experience with using the policy in this manner? My general feeling is that not many people are using slice as there has been very little mailing list traffic regarding it's usage. Be sure to let us know how it goes! Thanks, Rick On Sun, Mar 9, 2014 at 12:54 PM, Todd Nine t...@spidertracks.com wrote: Hi all, We're migrating from a Cassandra based JPA adapter to Amazon's RDS. In order to do this, we want a no downtime migration. To do this, we would need the following flow. 1) Start writing to both systems. Cassandra is still the authoritative record, and records are replicated to RDS. All queries will still be served from Cassandra on read. 2) In the background, read all records from Cassandra and write them to RDS. Use update timestamps to ensure we don't overwrite newly updated data. 3) Switch our read path (probably with a new deployment configured to only read from RDS) I've been looking at the Slices documentation, and it seems like defining a Data Replication Policy will perform the dual writes I need in steps 1) and 2). Does anyone have any experience with using the policy in this manner? Thanks in advance, Todd -- *Rick Curtis*
Re: Oracle error ORA-00604: ?? SQL ?? 1 ???? ORA-01000
Rick, I believe openjpa does not close the statement promptly OR an oracle database jdbc driver issue. It seem if manager is used to create a lot of native queries in a loop, the cursors in Oracle database will not be released promptly enough. I am using ojdbc6.jar + openjpa-1.2.3.jar. Anyway, I will try the cast method. thanks in advance. Regards, Yu Wang On Tue, Mar 11, 2014 at 10:01 PM, Rick Curtis curti...@gmail.com wrote: No, your question still isn't very clear. Actually I just want to find a OpenJpa equivalence to close() method of JDBC Statement class I believe that after OpenJPA is done processing a native query we will close the statement. If that isn't happening, you could try to cast your query to an OpenJPAQuery and call .closeAll() on it once you are done using it. Hope this helps. Rick On Tue, Mar 11, 2014 at 5:21 AM, yu wang wangy...@gmail.com wrote: Actually I just want to find a OpenJpa equivalence to close() method of JDBC Statement class On Tue, Mar 11, 2014 at 5:56 PM, yu wang wangy...@gmail.com wrote: Hi Rick, Is my case description clear enough? Any suggestions? Regards, Yu Wang On Sat, Mar 8, 2014 at 3:36 PM, yu wang wangy...@gmail.com wrote: Hi Rick, I have two very big master/slave tale I made them equal-partitioned by time stamp columns. So when users query something from two tables, I separate the sql into a lot small sql for a lot of very small interval in a loop to expedite the Execution of the SQL. Then I got too many cursors opened error from Oracle. What I am trying to is getting a way to close the cursor explicitly after get its result list. Regards, Yu Wang On Fri, Mar 7, 2014 at 10:00 PM, Rick Curtis curti...@gmail.com wrote: You're going to have to give a better description of your scenario for us to help you. Thanks, Rick On Fri, Mar 7, 2014 at 3:37 AM, yu wang wangy...@gmail.com wrote: Hi Gurus, I have manager.createNativeQuery() in a loop eventually lead to Oracle error: ORA-00604 and ORA-01000, which means cursors open in the oracle exceed the maximum. My question is how can I close some cursors explicitly in a loop? I try manager.clear() but seems it does not work. We are using OpenJPA 1.2.3. Regards, Yu Wang -- *Rick Curtis* -- *Rick Curtis*
Re: Issue with OpenJPA default cache, use external cache
Hi Alice, OpenJPA's L2 Cache provider is pluggable. Ehcache did provide a plugin for their cache [1], but this was some time ago and I don't know if they have kept it up-to-date. WebSphere also provided a plugin for their Dynacache offering [2]. This was introduced in the WAS v8.0 timeframe. I'm not aware of any issues related to this usage. I am not aware of any memcache plugin. But, since the cache plugin is public from an OpenJPA perspective [3], there is nothing stopping anybody from writing their own plugin. Good luck, Kevin [1] http://ehcache.org/documentation/integrations/openjpa-provider [2] http://pic.dhe.ibm.com/infocenter/wasinfo/v8r5/topic/com.ibm.websphere.nd.doc/ae/rdyn_openjpa.html [3] http://ci.apache.org/projects/openjpa/trunk/docbook/manual.html#ref_guide_cache On Tue, Mar 11, 2014 at 11:04 AM, Alice ashanai...@yahoo.com wrote: Thank you Rick for your response. I will check again to make sure we have bi-directional relation. We see this issue only when the parent entity has been saved before the FK entity is saved. I will confirm the bi-directional relation. Is there a way to plug in an external cache regardless of the issue? best, Alice -- View this message in context: http://openjpa.208410.n2.nabble.com/Issue-with-OpenJPA-default-cache-use-external-cache-tp7586064p7586073.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
Re: Issue with OpenJPA default cache, use external cache
http://ci.apache.org/projects/openjpa/trunk/docbook/manual.html#ref_guide_cache_conf On Tue, Mar 11, 2014 at 11:04 AM, Alice ashanai...@yahoo.com wrote: Thank you Rick for your response. I will check again to make sure we have bi-directional relation. We see this issue only when the parent entity has been saved before the FK entity is saved. I will confirm the bi-directional relation. Is there a way to plug in an external cache regardless of the issue? best, Alice -- View this message in context: http://openjpa.208410.n2.nabble.com/Issue-with-OpenJPA-default-cache-use-external-cache-tp7586064p7586073.html Sent from the OpenJPA Users mailing list archive at Nabble.com. -- *Rick Curtis*
Issue saving entities with fields that reference read only data
Hello, We are running into issues with saving entities with fields that reference read only data. If the entity has a field mapped with 'insertable = false' and/or 'updatable = false' for @Column or @JoinColumn, OpenJPA still tries to do an insert into the read only entity. It also complains that CascadeType.PERSIST has not been specified on the relationship. Is there a way to fix this issue? -- View this message in context: http://openjpa.208410.n2.nabble.com/Issue-saving-entities-with-fields-that-reference-read-only-data-tp7586076.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
Re: Issue saving entities with fields that reference read only data
If you are trying to persist an Entity that has a relationship to an (readonly) Entity that already exists in your DB, you should ensure that the existing Entity is a part of your persistence context (ie managed). OpenJPA is most likely complaining because we encountered an unmanaged field when persisting your non readonly Entity to the DB. So : ReadOnlyEntity e = em.find(...); // I assume this is different than what you are currently doing. NewEntity ne = new NewEntity(); ne.setRelationship(e); em.persist(e); Thanks, Rick On Tue, Mar 11, 2014 at 11:26 AM, Alice ashanai...@yahoo.com wrote: Hello, We are running into issues with saving entities with fields that reference read only data. If the entity has a field mapped with 'insertable = false' and/or 'updatable = false' for @Column or @JoinColumn, OpenJPA still tries to do an insert into the read only entity. It also complains that CascadeType.PERSIST has not been specified on the relationship. Is there a way to fix this issue? -- View this message in context: http://openjpa.208410.n2.nabble.com/Issue-saving-entities-with-fields-that-reference-read-only-data-tp7586076.html Sent from the OpenJPA Users mailing list archive at Nabble.com. -- *Rick Curtis*
Re: Oracle error ORA-00604: ?? SQL ?? 1 ???? ORA-01000
Rick, I tried closeAll() but still got ora-00604 if the loop times is numberous. I think it proves it is not an issue of openJPA and I will find the solution from Oracle JDBC driver or datapase parameters directions. Anyway, I appreciate your prompt help a lot. Regards, Yu Wang On Tue, Mar 11, 2014 at 11:29 PM, yu wang wangy...@gmail.com wrote: Rick, I believe openjpa does not close the statement promptly OR an oracle database jdbc driver issue. It seem if manager is used to create a lot of native queries in a loop, the cursors in Oracle database will not be released promptly enough. I am using ojdbc6.jar + openjpa-1.2.3.jar. Anyway, I will try the cast method. thanks in advance. Regards, Yu Wang On Tue, Mar 11, 2014 at 10:01 PM, Rick Curtis curti...@gmail.com wrote: No, your question still isn't very clear. Actually I just want to find a OpenJpa equivalence to close() method of JDBC Statement class I believe that after OpenJPA is done processing a native query we will close the statement. If that isn't happening, you could try to cast your query to an OpenJPAQuery and call .closeAll() on it once you are done using it. Hope this helps. Rick On Tue, Mar 11, 2014 at 5:21 AM, yu wang wangy...@gmail.com wrote: Actually I just want to find a OpenJpa equivalence to close() method of JDBC Statement class On Tue, Mar 11, 2014 at 5:56 PM, yu wang wangy...@gmail.com wrote: Hi Rick, Is my case description clear enough? Any suggestions? Regards, Yu Wang On Sat, Mar 8, 2014 at 3:36 PM, yu wang wangy...@gmail.com wrote: Hi Rick, I have two very big master/slave tale I made them equal-partitioned by time stamp columns. So when users query something from two tables, I separate the sql into a lot small sql for a lot of very small interval in a loop to expedite the Execution of the SQL. Then I got too many cursors opened error from Oracle. What I am trying to is getting a way to close the cursor explicitly after get its result list. Regards, Yu Wang On Fri, Mar 7, 2014 at 10:00 PM, Rick Curtis curti...@gmail.com wrote: You're going to have to give a better description of your scenario for us to help you. Thanks, Rick On Fri, Mar 7, 2014 at 3:37 AM, yu wang wangy...@gmail.com wrote: Hi Gurus, I have manager.createNativeQuery() in a loop eventually lead to Oracle error: ORA-00604 and ORA-01000, which means cursors open in the oracle exceed the maximum. My question is how can I close some cursors explicitly in a loop? I try manager.clear() but seems it does not work. We are using OpenJPA 1.2.3. Regards, Yu Wang -- *Rick Curtis* -- *Rick Curtis*
