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DBlink wait event in query not using it

A few days ago my colleagues migrated a small part of a very big DB to AWS.

As one of the apps remains in on premises, they created a Dblink between the on-prem db and the AWS Oracle RDS.

Since Monday, they are having performance problems in the on prem DB, but not in any query that uses the dblink.

What is even stranger is that the top problematic SQLs have as top event SQL Net more from dblink. But none of them use a dblink.

Actually, the queries that use the Dblink are all working fine.

Anyone can give me a hint, really appreciated

Comments

Hi.,

May i know which version of database you are using, Is it 19C, if 19C DB then, you are importing into the CDB or Any of PDB Database?

Based on your export command you have issued., I have given 2 scenario to perform as shown below.

expdp user/pass schemas=ctm920 directory=BACKUP_DIRDC logfile=backup.log filesize=1G

If you are using import on Container Database (CDB)

- Check the OS Directory is created & you have linked this OS Directory to DB directory.
Ex: $ mkdir -p /u01/dumpfile/
- Place dumpfile into /u01/dumpfile location.
- SQL> create or replace directory dumpfile as '/u01/dumpfile/';
- SQL> grant read, write on directory dumpfile to [import user];

impdp user/pass dumpfile=expdat.dmp logfile=imp_log.log directory=BACKUP_DIRDC TABLE_EXISTS_ACTION=REPLACE

If you are using import on Pluggable Database (PDB)

- Check the OS Directory is created & you have linked this OS Directory to DB directory.
Ex: $ mkdir -p /u01/dumpfile/
- Place dumpfile into /u01/dumpfile location.
- SQL> create or replace directory dumpfile as '/u01/dumpfile/';
- SQL> grant read, write on directory dumpfile to [import user];

impdp user/pass@(PDB NAME) dumpfile=expdat.dmp logfile=imp_log.log directory=BACKUP_DIRDC TABLE_EXISTS_ACTION=REPLACE

Keep us update.

Warm Regards,
Mir Sayeed Hassan
Oracle ACE Pro
Oracle Certified OCP | OCI

Solomon Yakobson 5 days ago

impdp parameter TABLE_EXISTS_ACTION=REPLACE applies to tables only. Errors you are getting indicate FUNCTION:"ctm920 "."CURRTIME", PROCEDURE:"ctm920 "."PURGE_CMR_RUNINF_1" and FUNCTION:"ctm920 "."DDIFF" already exist in target database. You need to decide do you want to keep there existing objects and for that you need to add EXCLUDE parameters to import or import them and for that you need to drop these objects before import.

SY.

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Added on Feb 14 2025
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