How will you delete data if TRUNCATE is not supported and log segment is also not big enough to support complete delete?

Originally Answered: How will you delete data if truncate is not supported and log segment is also not big enough to support complete delete? In some cases when TRUNCATE is not an option, because you need to preserve most of the data and log can not handle entire delete batch, you can write delete in the loop.

How do you delete specific data in SQL?

SQL DELETE

1. First, you specify the table name where you want to remove data in the DELETE FROM clause.
2. Second, you put a condition in the WHERE clause to specify which rows to remove. If you omit the WHERE clause, the statement will remove all rows in the table.

Which of the following is not a difference between TRUNCATE and delete?

TRUNCATE is a DDL(Data Definition Language) command and is used to delete all the rows or tuples from a table. Unlike the DELETE command, TRUNCATE command does not contain a WHERE clause. In the TRUNCATE command, the transaction log for each deleted data page is recorded.

What is the fastest way to delete data in SQL Server?

Inserting rows in a table is faster than deleting them. Loading data into a new table using create-table-as-select (CTAS) is faster still….Remove Rows with Create-Table-as-Select

1. Create a new table saving the rows you want to keep.
2. Truncate the original table.
3. Load the saved rows back in with insert as select.

Can we rollback TRUNCATE?

You cannot ROLLBACK TRUNCATE Simply, you cannot rollback a transaction if it is already committed but you can do something else to get the data back (or at least some parts of it). When you execute the TRUNCATE statement, your data is still in the MDF file.

Can DELETE be rolled back?

DELETE is a DML Command so it can be rolled back. The DELETE command returns the number of records that were deleted by its execution.

Can you rollback delete SQL?

We can rollback a delete query but not so for truncate and drop. When I execute queries then successfully done with rollback in delete, drop & truncate. We can rollback the data in conditions of Delete, Truncate & Drop. But must be used Begin Transaction before executing query Delete, Drop & Truncate.

Can we rollback the data after TRUNCATE?

“TRUNCATE TABLE is not logged and therefore cannot be rolled back. You have to use DELETE, if in a transaction.”

Why delete is slower than truncate?

The DELETE command is used to remove rows from a table based on WHERE condition. It maintain the log, so it slower than TRUNCATE. The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row.

How delete large data from table in SQL Server?

Options to Delete the Data

1. Using TOP Clause. Another approach is to use a TOP clause with a DELETE statement to limit the number of rows deleted as shown below.
2. Using ROWCOUNT property.
3. Using a Cursor.
4. Using a While Loop.
5. Using GO with a count.
6. Generating the DELETE Statements.
7. Executing the File using SQLCMD.

How do I rollback and TRUNCATE data in SQL?

MS SQL: The concept that a Truncate statement cannot be rolled back is fairly commonly misunderstood. When you execute a Truncate statement, it does not get logged in the log file as it is a DDL statement. So if you Truncate a table, you cannot Roll Back to a point in time before the truncate.

How do I remove database from SQL Server?

To delete a database In Object Explorer, connect to an instance of the SQL Server Database Engine, and then expand that instance. Expand Databases, right-click the database to delete, and then click Delete. Confirm the correct database is selected, and then click OK.

How do you delete a record in SQL?

To delete an entire record/row from a table, enter “delete from” followed by the table name, followed by the where clause which contains the conditions to delete. If you leave off the where clause, all records will be deleted.

How do you delete a file in SQL?

In Object Explorer, connect to an instance of the SQL Server Database Engine and then expand that instance. Expand Databases, right-click the database from which to delete the file, and then click Properties. Select the Files page. In the Database files grid, select the file to delete and then click Remove.

How do you remove rows from a table in SQL?

Open phpMyAdmin and log in. Select the database from the left menu. Select a table from the list in the left menu or in the center box. Select Drop from the center row of the table you want to delete. Drop is SQL-speak for delete. Confirm in the popup box that appears. The table is deleted.