SQL - @@TOTAL_WRITE Function

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The SQL @@TOTAL_WRITE statistical function is used to retrieve the number of disks writes. It returns the total number of disk writes by the SQL server instance since the last time SQL server was started.

Syntax

Following is the syntax of the SQL @@TOTAL_WRITE function −

@@TOTAL_WRITE  	

Return type

The return type of this function is an INTEGER.

Parameters

• It does not accept any parameters.

Return value

This function returns the number of disk writes.

Example

In the following example,we are using the SQL @@TOTAL_WRITE function to retrieve the number of disk writes by this SQL server.

SELECT @@TOTAL_WRITE AS Number_of_disk_writes;

Output

Following is the output of the above SQL query −

+-----------------------+
| Number_of_disk_writes |
+-----------------------+
| 6846                  |
+-----------------------+

Example

The following is another example of the SQL @@TOTAL_WRITE function. You can also use the GETDATE() function to retrieve the number of disk writes until today by the SQL server, since the SQL server last started.

SELECT GETDATE() AS Curr_date, @@TOTAL_WRITE AS Number_of_disk_writes;

Output

The above statement produces the following output −

+-------------------------+-----------------------+
| Curr_date               | Number_of_disk_writes |
+-------------------------+-----------------------+
| 2023-03-02 14:19:46.137 | 6861                  |
+-------------------------+-----------------------+

Example

In this example, we are using both SQL @@TOTAL_WRITE and @@TOTAL_READ functions along with the GETDATE() function to retrieve the total number of disk writes until today by the SQL server instance since it was last started.

SELECT GETDATE() AS Curr_date, @@TOTAL_WRITE AS Number_of_disk_writes, @@TOTAL_WRITE AS Number_of_disk_reads;

Output

On executing the above query, it will produce the following output −

+-------------------------+-----------------------+----------------------+
| Curr_date               | Number_of_disk_writes | Number_of_disk_reads |
+-------------------------+-----------------------+----------------------+
| 2023-03-02 14:32:23.023 | 6880                  | 6880                 |
+-------------------------+-----------------------+----------------------+