[ORACLE] Useful scripts for the day-to-day life of a DBA (Part 3) - System metrics

Hello everyone.

 

Hope you're doing well!

As I said here, I've created a repository on GITHUB to share some scripts that I like to make and that help me in my day-to-day life as a DBA.

 

Today's script is showmetrics.sql and is in the ENVIRONMENT directory.     
 

This script is used to check all system metric values of the long-duration and their details. If the standard deviation in the metrics is high, it marks the metric for verification.

 

It's the first version, so I'm sure the Advisor needs some 'tuning' 😆. The attempt here is to mark the metrics with a standard deviation above 50% for verification.

Remember that these are scripts that you can use and change at your own risk. They help me a lot, but they may not be as functional for you.

And more important, my script, my rules for advice, ok? 😆

If you think you have a better metric, and want to suggest it, I'd be happy to listen and analyze it.

And always remember:

1. Some scripts are a compilation of several other scripts I've created.
   
2. Some scripts are based on and adapted from existing scripts. Those that I found reference to the author I obviously identify in the script.
3. So, if there's a script that you're the author of and I've adapted to my reality and it's not mentioned, please let me know and I'll be happy to reference it.
4. Because they're my scripts, they have my logic and help me in my day-to-day work, it doesn't mean that they're the best or that they're always the most refined and concerned with good practices. They can help you, but that's all.
5.  Feel free to make changes, but please keep the reference to the authors.
6.  If you find any mistakes, please let me know.

Feel free to download here.

Regards

Mario Barduchi

[ORACLE] Useful scripts for the day-to-day life of a DBA (Part 2) - Execution Plan

Hello all 

 

Hope you're doing well!

As I said here, I've created a repository on GITHUB to share some scripts that I like to make and that help me in my day-to-day life as a DBA.

 

 

Today's script is showplan.sql and is in the SQLPLAN directory.     
 
The script serves to help monitor and check active execution plans and try to create an advisor for sql plans with problems. 

 

It's the first version, so I'm sure the Advisor needs some 'tuning' 😆. The attempt here is to flag potentially problematic plans, just a starting point for further analysis.

You can use this script in combination with Carlos Sierra's coe_xfr_sql_profile.sql to define a better plan, for example.

Remember that these are scripts that you can use and change at your own risk. They help me a lot, but they may not be as functional for you.

My script, my rules for advice and tuning, ok?

 

The repository is https://github.com/MarioBarduchi/Scripts2DBA.

 

The script is: https://github.com/MarioBarduchi/Scripts2DBA/blob/main/SQLPLAN/showplan.sql

 

And always remember:

1. Some scripts are a compilation of several other scripts I've created.
   
2. Some scripts are based on and adapted from existing scripts. Those that I found reference to the author I obviously identify in the script.
3. So, if there's a script that you're the author of and I've adapted to my reality and it's not mentioned, please let me know and I'll be happy to reference it.
4. Because they're my scripts, they have my logic and help me in my day-to-day work, it doesn't mean that they're the best or that they're always the most refined and concerned with good practices. They can help you, but that's all.
5.  Feel free to make changes, but please keep the reference to the authors.
6.  If you find any mistakes, please let me know.

Feel free to download and use.

Regards

Mario Barduchi

[ORACLE] Useful scripts for the day-to-day life of a DBA (Part 1) - RMAN & SGA

Hello all 

 

Hope you're doing well!

I've created repository at GITHUB and I'm going to start sharing some scripts that I like to make and that help me in my day-to-day life as a DBA.

 

But some considerations are important:

1. Some scripts are a compilation of several other scripts I've created.
   
2. Some scripts are based on and adapted from existing scripts. Those that I found reference to the author I obviously identify in the script.
3. So, if there's a script that you're the author of and I've adapted to my reality and it's not mentioned, please let me know and I'll be happy to reference it.
4. Because they're my scripts, they have my logic and help me in my day-to-day work, it doesn't mean that they're the best or that they're always the most refined and concerned with good practices. They can help you, but that's all.
5.  Feel free to make changes, but please keep the reference to the authors.
6.  If you find any mistakes, please let me know.

The first scripts are for monitoring RMAN and one that combines various Advisors' results to suggest SGA tuning.

Remember that these are scripts that you can use and change at your own risk. They help me a lot, but may not be as functional for you.

 

The repository is https://github.com/MarioBarduchi/Scripts2DBA.

 

Feel free to download and use.

Regards

Mario Barduchi

[ORACLE] Create OCI DB System using the console.

Hello everyone!

I hope you're doing well.

Today, I going to show you how to create a new DB system in OCI.

Let's get started.

 

1) Select Oracle Database -> Oracle Base Database Service in the OCI console and click on "Create DB system".

 

 

 

2) Enter the compartment and DB system names.

 

3) Click on "Change Shape" and select your preferred shape.

 

 

4) Configure the storage. To do this, click on "Change Storage".

 

Select the storage management software, and configure the storage performance and size.

5) Configure the Oracle Database software edition and the DB system node count.

 

We have 4 database software edition options: 

• Standard Edition
• Enterprise Edition
• Enterprise Edition High Performance
• Enterprise Edition Extreme Performance.

 

6) Add the ssh key and select whether to use your own licences or the license included model.

 

7) Now, specify the VCN and subnet to want to use.

 

 

The private IP will be created automatically, if you don't configure it.

 

 

8) Click "Next".

 

 

9) Now let's configure the database information.

 

Click "Change database image".

10) Select the database image.

 

 

11) Configure the SYS and TDE passwords, as well as the backup service.

Finally, click on “Create DB system”.

After 90 minutes (average), you will have a DB system ready to use.

And that's it. I hope it helps you.

 

Regards

Mario Barduchi

[ORACLE] Alter database open resetlogs failed after restore. And the problem was my Redo logs.

Hello all

 

How are you doing?

 

I was creating a new test environment today and I tried to open a database that I had restored. 

 

Simple. Of course not.

 

SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-00349: failure obtaining block size for '+REDO/FOLHAHOM/ONLINELOG/group_4a.rdo'
ORA-15001: diskgroup "REDO" does not exist or is not mounted
ORA-15001: diskgroup "REDO" does not exist or is not mounted
ORA-15001: diskgroup "REDO" does not exist or is not mounted

 

I checked the redo log files. They were wrong and I have no idea why.

set pages 120 lines 10000;
SELECT 

    l.INST_ID, l.THREAD#, l.GROUP#, 

    substr(lf.MEMBER,1,75) as MEMBER, 

    l.SEQUENCE#, l.first_change#, 

    l.BYTES/(1024 * 1024) AS "Size MB", 

    l.MEMBERS, l.ARCHIVED, l.STATUS, 

    lf.IS_RECOVERY_DEST_FILE, l.CON_ID
FROM gv$log l
JOIN gv$logfile lf ON
    l.INST_ID = lf.INST_ID AND
    l.GROUP# = lf.GROUP#
ORDER BY 1,2,3;

Maybe I forgot to set log_file_name_convert. 

 

I don't know and It doesn't matter. I didn't want to do the whole process again.

I can't drop the log file group because the status “CLEARING_CURRENT”, of course.

Kids, don't try it at home? 😜

I'm just kidding, but this solution is a workaround and should only be used in an emergency.

And remember: This is a test environment. Production can and probably will be different, so use at your own risk.

Let's go to the party:

 

-- Thread 1

SQL> ALTER DATABASE RENAME FILE '+REDO/FOLHAHOM/ONLINELOG/group_6a.rdo' TO '+REDO1/FOLHAHOM/ONLINELOG/group_6a.rdo';
Database altered.

-- Thread 2
SQL> ALTER DATABASE RENAME FILE '+REDO/FOLHAHOM/ONLINELOG/group_11a.rdo' TO '+REDO1/FOLHAHOM/ONLINELOG/group_11a.rdo';
Database altered.

set pages 120 lines 10000;
SELECT 

    l.INST_ID, l.THREAD#, l.GROUP#, 

    substr(lf.MEMBER,1,75) as MEMBER, 

    l.SEQUENCE#, l.first_change#, 

    l.BYTES/(1024 * 1024) AS "Size MB", 

    l.MEMBERS, l.ARCHIVED, l.STATUS, 

    lf.IS_RECOVERY_DEST_FILE, l.CON_ID
FROM gv$log l
JOIN gv$logfile lf ON
    l.INST_ID = lf.INST_ID AND
    l.GROUP# = lf.GROUP#
ORDER BY 1,2,3;

 

Can I rename all the members of the log file?

Yes, but I preferred to recreate all the log file groups.

 

 

 

SQL>  alter database add logfile thread 1 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL> alter database add logfile thread 2 ('+REDO1','+REDO2') size 512M;
Database altered.
 

SQL>  alter database add logfile thread 1 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL>  alter database add logfile thread 1 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL>  alter database add logfile thread 1 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL>  alter database add logfile thread 1 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL> alter database add logfile thread 2 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL> alter database add logfile thread 2 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL> alter database add logfile thread 2 ('+REDO1','+REDO2') size 512M;
Database altered.

SQL> alter database add logfile thread 2 ('+REDO1','+REDO2') size 512M;
Database altered.

 

SQL> ALTER DATABASE DROP LOGFILE GROUP 4;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 5;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 7;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 8;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 9;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 10;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 12;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 13;
Database altered.

SQL> alter system checkpoint;
System altered.

I checked that the old groups were inactive and dropped the last two groups.

set pages 120 lines 10000;
SELECT 

    l.INST_ID, l.THREAD#, l.GROUP#, 

    substr(lf.MEMBER,1,75) as MEMBER, 

    l.SEQUENCE#, l.first_change#, 

    l.BYTES/(1024 * 1024) AS "Size MB", 

    l.MEMBERS, l.ARCHIVED, l.STATUS, 

    lf.IS_RECOVERY_DEST_FILE, l.CON_ID
FROM gv$log l
JOIN gv$logfile lf ON
    l.INST_ID = lf.INST_ID AND
    l.GROUP# = lf.GROUP#
ORDER BY 1,2,3;

SQL> ALTER DATABASE DROP LOGFILE GROUP 6;
Database altered.

SQL> ALTER DATABASE DROP LOGFILE GROUP 11;
Database altered.

 

SQL> ALTER DATABASE ENABLE thread 2;

 

 

And that's it. I hope I've helped you.

Regards

Mario