How to Check Default Temp Tablespace in Oracle

In this article, we will guide you through the process of checking default temp tablespaces in Oracle. We will discuss why it’s important to check these settings and provide you with step-by-step instructions on how to do so.

When a new session starts in Oracle, it creates a temporary tablespace by default. This temporary tablespace is used for storing temporary objects like table data, indexes, and other temporary structures. The size of the temp tablespace can affect your system’s performance, especially if it runs out of space or is too large.

Here are the steps to check default temp tablespace in Oracle:

Log in to SQL*Plus as SYSDBA.
Run the following command:
```
SELECT value FROM dba_sessions WHERE sid IS NOT NULL AND name  'DEFAULT';
```
This will return the name of the default session, which is used to create temporary objects.
Run the following command:
```
SELECT tablespace_name, size, free_space FROM dba_tablespaces WHERE tablespace_name IN (SELECT tablespace_name FROM dba_sessions WHERE sid  :sid);
```
Replace :sid with the default session’s SID. This will return a list of temporary tablespaces used by the default session. You can also check the size and free space of each temporary tablespace.
Check the size and free space of the temp tablespace by running the following command:
```
SELECT tablespace_name, size, free_space FROM dba_tablespaces WHERE tablespace_name  'temp';
```
This will return the size and free space of the temp tablespace used for temporary objects.

In conclusion, checking default temp tablespace in Oracle is important to ensure optimal system performance. Following these steps, you can easily check the settings and make necessary changes if needed. Remember to always test any changes before implementing them in a production environment.