In this blog, I will cover some typical TNS errors that we run across as an Oracle DBA and how to go about troubleshooting the errors. First of all, when you encounter a TNS error you need to understand that it relates to the network communication between a client...
The Linux OS from major vendors, including Red Hat, Ubuntu, and Debian, has defaults set out of the box that works well with minimally spec'd hardware. However, if you want the best performance for your MySQL databases, you need to make changes in how Linux handles...
In this blog, I'll be giving a tutorial on an Oracle hidden gem using an Oracle tool to securely allow you to run RMAN without passing the password in cleartext. The Oracle Database Secure External Password Store feature, which does not require any additional license...
The steps below outline how to convert an Oracle 12c non-container database to a pluggable database in the multitenant architecture. Oracle has moved all future releases to the multitenant architecture so conversion will eventually be necessary. These steps are...
Before Oracle 11g access to network services was controlled by granting privileges on packages such as UTL_HTTP, UTL_TCP, UTL_SMTP, and UTL_MAIL. After 11.1 Oracle introduced Application Control Lists (ACL) as part of their Application Security and has now added...
If you're in a situation where you need to resolve a gap in a Data Guard environment due to missing/corrupt archive logs, rolling forward the Physical Standby would be your best option vs. having to rebuild your entire physical standby database. It has become much...
Prior to diving into this error, it's important we discuss how Oracle processes queries logically and in what order. Oracle has a couple of rules as to how it executes each query in a specific processing order. Oracle processes a query as below: Gathers rows based on...
Recovery Catalog Purpose: The RMAN recovery catalog is a schema created inside of a new or existing database that is used to store metadata about Oracle databases. It's recommended by XTIVIA that the catalog be created in its own dedicated database due to the...
This article explains how to configure Oracle Golden Gate software to perform a unidirectional replication from a source non-CDB database on Oracle 12c to a target pluggable database on Oracle 19c. One possible use case is if you need to migrate from your non-CDB...
Problem: ORA-01653: unable to extend table SYS.AUD$ by 1024 in tablespace SYSTEM This error generally results when the aud$ table has a next_extent value that is greater than the available contiguous space in the SYSTEM tablespace. The aud$ table records logins to the...