The transaction log for database 'mydatabase' is full

Issue : The transaction log for database 'mydatabase' is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases

Resolution :

BACKUP LOG WITH TRUNCATE_ONLY
GO
DBCC SHRINKFILE (, 1)
GO

Basic Understanding for Sql server

* Difference between Clustered Index and Non Clustered Index

- A Clustered Index consists of index as well as data pages. Clustered Index is not just an index but also contains the table data. A clustered index is organized as a B-tree where the non-leaf nodes are index pages and the leaf nodes are data pages.

- A Non-clustered index is organized as a B-tree but it consists of only index pages. The leaf nodes in a non-clustered index are not data pages, but contains pointer for individual rows in a data pages.

* Master Database contains login Information.
* MSDB Database contains Job Information.
* Model system database is default to FULL recovery model.


* Difference between Primary Key and Unique Key is as follows

- Primary key prevents the duplication of key values and does not allow NULL values. It allows each row in a table to be identified uniquely.
- Unique Key does not same what Primary Key does except it allows NULL record.

* Only One NULL values can be inserted for column that has Unique Key defined.

* Difference between Clustered Index and Non Clustered Index

- A Clustered Index consists of index as well as data pages. Clustered Index is not just an index but also contains the table data. A clustered index is organized as a B-tree where the non-leaf nodes are index pages and the leaf nodes are data pages.

- A Non-clustered index is organized as a B-tree but it consists of only index pages. The leaf nodes in a non-clustered index are not data pages, but contains pointer for individual rows in a data pages.

Stuff Keyword in Sqlserver

STUFF - The STUFF function inserts a string into another string. It deletes a specified length of characters in the first string at the start position and then inserts the second string into the first string at the start position.

Syntex - STUFF (character_expression , start , length ,character_expression )

Example -

SELECT STUFF('VABCDERBHATT', 2, 6, 'iral');
GO