Why my Data Guard Physical Standby always had Apply Lag greater than 30 minutes?
Hey everyone, Hope you’re doing good. I had a call with a client some days ago, they have a Data Guard Physical Standby running in protection mode Maximum Performance. This protection mode provides the highest level of data protection that is possible…
Gathering Dictionary Statistics Runs Very Long Time. Why?
Hey everyone, Hope you’re doing good. We have a client that has a database used for a SAP BI solution (BW – Business Warehouse), which had stale statistics for dictionary and fixed tables. When I asked the DBA team they said: is…
How to Create a Job using DBMS_SCHEDULER to execute a Shell Script every Thursday at 9:00 am
Hey everyone, Hope you’re doing good. I was working for a client which would like to schedule a schell script every Thursday at 9:00 am to remove old traces. Client had only one requirement: use DBMS_SCHEDULER instead Cron. For this, first we need to create…
How to Create a SQL Patch for a Query from the AWR views
Hey everyone, Hope you’re doing good! In most applications, application code is static and cannot be modified by users. If there is a performance issue with application SQL, one potential solution is to modify it adding hints to force the desired access path. Sometimes, the…
How to Change TDE Wallet Password
Hey everyone, Hope you’re doing good. In the last two years I worked for a client where we have activated TDE (Transparent Data Encryption), where we have enabled the encryption for datafiles on tablespaces used by application. To use TDE, the requirement is to have…
ORA-01565 ORA-01034 ORA-00205 Linux-x86_64 Error: 13: Permission denied when starting DB Instance
Hey everyone, Hope you’re all doing good. A few days ago, I received a call from a client regarding an issue during a RAC instance startup running on 19.17 version. This environment consists in a 2-node RAC, running with user segregation, so, for Grid Infrastructure…
How to copy SQL Patches, SQL Profiles and SQL Baselines between environments
Hey Everyone, Hope you’re fine. This is a simple and short post, but extremely useful. I was in a migration project and client used PreProd environment for stress test, code deploy, functional validations, etc. This PreProd environment have the sizing similar with…
Sequence value JUMPING after some “error”
Hey everyone, Hope you’re doing well. This week it happened a “good” discussion in a WhatsApp Group for a DBA Brazilian Community (DBA Brasil). One colleague was facing an “inexplicable” situation. He had an object SEQUENCE, configured with INCREMENT_BY to 1 and CACHE_SIZE to 20…
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