How to move online tablespace in Oracle 19c

A few days ago, when the team performed some application deployment tasks, we noticed that the different schemas created in the datafiles, which belong to a TBS, were created at the destination of the CDB or PDBs.

We start with the first task of verifying that the db_create_file_dest parameter was configured.

This parameter which differs in container paths from PDB is the one that guarantees that, through the OMF utility, the datafiles are created in the correct paths.

A demo was made, to understand the problem with developers, DevOps and dbas.
So that the importance of setting these values and the impact of not having their configuration is understood.

Likewise, we proceeded to move the data files, from the wrong paths to the correct paths where the data files should be created.

Hands-on

Check and configure the db_create_file_dest.

Check the default configuration

show parameter db_create_file_dest
SQL> show parameter db_create_file_dest

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
db_create_file_dest                  string
SQL>

It’s empty.

Set the configuration for Container Database (CDB)

ALTER SYSTEM SET db_create_file_dest='/opt/oracle/oradata/ORCLCDB';
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How to find Hidden Parameters in Oracle

The oracle database has hundreds of hidden parameters, and a lot of those parameters are not documented.

Knowing about those parameters is important for dbas involved in database migrations and upgrades.

Many parameters have a high-performance improvement on different systems.

Here, I share how to query and change the oracle hidden parameters.

Query to find hidden parameters in oracle 12c , 18c and 19c

 set line 150
 col PARAMETER format a30
 col DESCRIPTION format a60
 col SESSION_VALUE format a10
 col INSTANCE_VALUE format a10
 spool HIDDEN_parameter_database.log


 SELECT a.ksppinm AS parameter,
        a.ksppdesc AS description,
        b.ksppstvl AS session_value,
        c.ksppstvl AS instance_value
 FROM   x$ksppi a,
        x$ksppcv b,
        x$ksppsv c
 WHERE  a.indx = b.indx
 AND    a.indx = c.indx
 AND    a.ksppinm LIKE '/_%' ESCAPE '/'
 ORDER BY a.ksppinm;

spool off

Now, after we save this list, is possible that we need to start with a pontificated change.

Hidden ParameHow can I set the value of a hidden parameter?

alter system set "_report_capture_cycle_time"=0 scope=spfile sid='*';

Remember, the importance that these parameters must be recommendations of the oracle support, because it can change the behavior of the engine and can leave us in the situation of not having support.

How to identified issues with ADRCI

In oracle 19 the previously version ADRCI (Automatic Diagnostic Repository Command Interpreter) is a great tool to solve issues and deal with Oracle Errors and Trace files

We could verify in the alert the oracle error :

Here, we will review quickly and easily and introduction to know the most basic commands to start.

I will start, as common with an alert log file:

tail -f /u01/app/oracle/diag/rdbms/orcl/ORCL/trace/alert_ORCL.log
Alert log evidence

For years, Oracle has provided us with the possibility of reviewing in the alert log, the most critical movements such as the behaviour of database engine processes.

Hands-on

Now, we start how to ADRCI we help us to understand our issue.

oracle@DSORA02:~/JuanAndresMercado $ adrci

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How to Start , Stop and Restart database easy in Oracle 19.

Hello friends, here again.

It’s a minimal post to share this option to start, stop and restart the oracle databases as Linux services.

If you remember in my last article oracle installation, we used the file oracledb_ORCLCDB-19c to configure and install the databases and containers, we will use the same script as the operating system service.

We must run this script as a root user ever because will appear error as follow:

You must be root user to run the configurations script. Login as root user and try again.
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Delete archivelog until time

Many, but many times people have problems with the archive logs. And call our team to save you…. The FRA is full.

So… we discovered that they did not take policies and controls about the databases when they have 100 o more databases to admin.

Here… the script to clean… but remember… this is not the solution.

The solution is planning and automatization. Happy delete!

All:

delete archivelog all;

The Last Day:

delete archivelog until time 'SYSDATE-1';

Specific Sequence or Between Sequence:

delete archivelog until sequence 456;

delete archivelog from sequence 456 until sequence 1000;

Specific Time:

delete archivelog until time "to_date('SEP 21 2018 20:00:00','Mon DD YYYY HH24:MI:SS')";

Install Oracle 19c – RPM Package Mode

Simple and easy, as it should always be.

For years I wanted to witness this moment, install oracle database in a single, simple and fast method.

With the current CI-CD paradigm, continuous deployments, continuous delivery and continuous integration, Oracle really had to provide such a solution.

Through this methodology, which involves performing the installation and configuration of the database, in a simple and agile way, it can be part of a Jenkins process or TeamCity job.


We are going to review the steps that we are going to execute:

  • Configuration of the Operating System and Download Packages.
  • Installation of the database Software.
  • Install a Database, Oracle 19, Container and a PDB.
  • Install Listener and OS Services.

Hands On

Obtain the RPM file and configure the Operating System

On my case , I use Oracle Linux.

Oracle Linux Server release 7.2

I’m login as root , execute the yum commands.

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Oracle Database 19c, Now Available !

Oracle 19c

Hi Friends !

I’m come back to share the last recently news about the Oracle Databases.

Oracle Database 19c is the long-term support version of the Oracle Database 12c and 18c family of products, which is available to Premier and Extended Support customers through March 2023 and March 2026, respectively.

It is available on Linux, Windows, Solaris, HP / UX and AIX platforms, as well as Oracle Cloud.

Oracle Database 19c offers customers the best performance, scalability, reliability and security for all their analytical and operational workloads.

Oracle 19 c : https://docs.oracle.com/en/database/oracle/oracle-database/19/index.html