Suppose I have a pair of tables, A and B, that are in a standard one to many relationship, with B containing a foreign key to A. I’d like to introduce a table C with a many-to-many relationship to B, but with the restriction that, for any given record in C, all of the associated records in B are associated with a single record in A. A simple link table between C and B provides the desired many-to-many relationship, but it does nothing to prevent a single record in C from being associated with B’s tied to different A’s. The only way I can think of accomplishing this in the database is to create a trigger to check and enforce the condition. Are there other applicable techniques?

Suppose I have a pair of tables, A and B, that are in a standard one to many relationship, with B containing a foreign key to A. I’d like to introduce a table C with a many-to-many relationship to B, but with the restriction that, for any given record in C, all of the associated records in B are associated with a single record in A. A simple link table between C and B provides the desired many-to-many relationship, but it does nothing to prevent a single record in C from being associated with B’s tied to different A’s. The only way I can think of accomplishing this in the database is to create a trigger to check and enforce the condition. Are there other applicable techniques?

Suppose I have a pair of tables, A and B, that are in a standard one to many relationship, with B containing a foreign key to A. I’d like to introduce a table C with a many-to-many relationship to B, but with the restriction that, for any given record in C, all of the associated records in B are associated with a single record in A. A simple link table between C and B provides the desired many-to-many relationship, but it does nothing to prevent a single record in C from being associated with B’s tied to different A’s. The only way I can think of accomplishing this in the database is to create a trigger to check and enforce the condition. Are there other applicable techniques?

ERROR
ORA-12543: TNS: destination host unreachable
I have been facing this issue for the past few weeks can anyone resolve this?

ERROR
ORA-12543: TNS: destination host unreachable
I have been facing this issue for the past few weeks can anyone resolve this?

I am needing to monitor memory usage on an Oracle database server.

TypeError: Cannot read properties of undefined (reading ‘longTermBackupSchedule’)
at getJsonObj (/home/ubuntu/work/OCI-CloudKIT/node_modules/oci-database/lib/model/update-autonomous-database-details.js:73:43)
at Object.serialize (/home/ubuntu/work/OCI-CloudKIT/node_modules/oci-common/lib/object-serializer.js:30:39)
at DatabaseClient. (/home/ubuntu/work/OCI-CloudKIT/node_modules/oci-database/lib/client.js:23798:54)
at Generator.next ()
at /home/ubuntu/work/OCI-CloudKIT/node_modules/oci-database/lib/client.js:40:71
at new Promise ()
at __awaiter (/home/ubuntu/work/OCI-CloudKIT/node_modules/oci-database/lib/client.js:36:12)
at DatabaseClient.updateAutonomousDatabase (/home/ubuntu/work/OCI-CloudKIT/node_modules/oci-database/lib/client.js:23775:16)
at file:///home/ubuntu/work/OCI-CloudKIT/server.js:12859:35
at process.processTicksAndRejections (node:internal/process/task_queues:95:5) im getting this error while usig the update api for oracle autonomous db system the even after providing the parameter the api still not accepting it

I see conflicting information on the Internet, that’s why I’m asking on this forum.
When will Oracle Database 23ai on-premise be available for download?

I have application which is connecting to database. Database is up and running because I can connect to it via SQLDeveloper (so I also know that credentials are correct).
However when I try to connect from application I have an error:

For a row in an Oracle table – if I read the ORA_ROWSCN now and store it then moments (or days) later read the ORA_ROWSCN and it is the same, can I safely know that the row has not changed?