Summary: in this tutorial, you will learn how to restore an SQL dump file by using the mysql tool.

Setting up a sample database

First, create a new database called mydb:

Second, use the mydb database:

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Third, create a new tabletests with one column:

Fourth, insert some rows into the tests table:

The resulting.sql file produced by mysqldump contains a set of SQL INSERT statements that can be used to reload the dumped tables at a later time. This backup operation acquires a global read lock on all tables at the beginning of the dump (using FLUSH TABLES WITH READ LOCK ).

  1. In Object Explorer, make instance connected to SQL Server Database Engine and then expand that instance. Expand Databases, right-click it from which to delete the file, and then click Properties.
  2. A complete memory dump may contain data from processes that were running when the memory dump was collected. You can refer to the below link for details on Memory Dump Files: Overview of memory dump file options for Windows 2000, Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7 and Windows Server 2008 R2.
  3. You need to find the create table statement of your table, and find the next create table statement. Say they are n1 and n2. Then you can just delete them with sed as above. Sed 'n1,n2d' dump.sql new.sql you can just grep create table and note the line numbers for your prework.
  4. SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL And, Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL.

Finally, use the mysqldump to dump the mydb database:

Note that you must have the c:backup directory available on your computer or server.

Restoring an SQL dump file using the SOURCE command

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To restore the mydb.sql SQL dump file, you follow these steps:

First, connect to MySQL server:

Second, drop the mydb database:

Third, use the SOURCE command to load the dump file:

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The command created a database mydb, select the database, and execute other SQL statements. In addition, it showed all the possible warnings and errors.

It is recommended that you use the SOURCE command to restore a dump file because the SOURCE command returns very detailed information including warnings and errors.

In this tutorial, you have learned step by step how to restore a dump file by using the mysql tool.

There's no doubt that log file will become larger and larger with the growth of SQL Server database file. However, it will influence the running speed of computer and occupy more and more space. This is not what we expect to see. So sometimes, it is necessary to shrink even delete SQL Server log file.

The following introduced ways will be applied to SQL Server 2014/2012 to delete log file with SQL Server Management Studio or Transact – SQL.

Way 1: Delete SQL Server Log File in SQL Server Management Studio

Step 1: Shrink Server log file

1. Login in SQL Server Management Studio. In Object Explorer, expand that instance that is connected to SQL Server.

2. Unfold Databases and then right-click the database that you want to shrink.

3. Turn to Tasks - Shrink, and then click Files.

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4. Select the file type and file name.

Generally, log file will be shrunk after you click OK now. But if you want to set it in more detailed, options below can be selected.

Option 1: Select Release unused space check box.

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Option 2: Select Reorganize files before releasing unused space check box.

If this is selected, the Shrink file to value must be specified. By default, the option is cleared.

Option 3: Enter the maximum percentage of free space to be left in the database file after the database has been shrunk. The value can be between 0 and 99. This option is only available when Reorganize files before releasing unused space is enabled.

But if we prepare to delete data, the primary data file cannot be made smaller than the size of the primary file in the model database.

Option 4: Select the Empty file by migrating the data to other files in the same filegroup check box.

5. Click OK.

Step 2: Delete SQL Server log file

1. In Object Explorer, make instance connected to SQL Server Database Engine and then expand that instance.

2. Expand Databases, right-click it from which to delete the file, and then click Properties.

3. Select the Files page. In the Database files grid, select the file to delete and then click Remove.

4. Click OK.

Way 2: Delete SQL Server Log File with Transact-SQL

If you are familiar with Transact-SQL, follow this way to work for SQL Server database or log file deletion.

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Step 1: Empty SQL log file

1. Connect to the Database Engine.

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2. From the Standard bar, click New Query.

3. Copy and paste the following example into the query window and click Execute.

USE UserDB;
GO
DBCC SHRINKFILE (DataFile1, 8);
GO

This example uses DBCC SHRINKFILE to shrink the size of a data file named DataFile1 in the UserDB database to 8 MB.

Step 2: Delete SQL Server log file

1. Connect to the Database Engine.

2. From the Standard bar, click New Query.

3. Copy and paste the following example into the query window and click Execute. This example removes the file test1dat4.

USE master;
GO
ALTER DATABASE AdventureWorks2012
REMOVE FILE test1dat4;
GO

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Comparing Way 1 to Way 2, the first way is undoubtedly easier for SQL Server new users. But command can work fast. However, it will be easier to controll failure rate when deleting SQL Server file using SQL Server Management Studio. In a word, they can shrink and then delete database file or log file. The difference is just the implementation.

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