What does filestream do

The other approach is to store the unstructured data as disk files and store the location of the file in the table along with the other structured data linked to it. This approach was found to be good in terms of performance, but does not ensure transactional consistency. Moreover management backup, restore, security etc of the data will be a pain too. This is not true. Any data that you store in such columns will be stored in the NT file system as a disk files and a pointer to the disk file is stored in the table.

The size of the file is limited by the size of the disk volume only. Note the portion highlighted in yellow. SQL Server will create the root folder and configure it. If the folder already exists, the operation will fail with an error. It is important that this folder should not exist at the time of creating the database.

Make sure that you do not tamper with this file. This time you will notice that a new folder is created in the root folder with a GUID value as its name. We have got the table created. Let us now add a couple of rows to the table we created.

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Close ;. Read ;. Deleting files is straightforward. It will be deleted by Garbage Collector. Garbage Collector process executes when the checkpoint event occurs. By giving an explicit checkpoint, you can delete it immediately after deleting from the table. CodingSight is open for new authors and partnership proposals. Send your offers and ideas to marketing devart.

This approach is effective to maintain transactional consistency and reduces the file management complexity, but when the client application reads data from the SQL table, it uses SQL memory which leads to poor performance. This approach gives huge performance improvement, but it does not ensure the transactional consistency moreover file management was difficult too. The example writes text data into a file.

For convenience, we use the StreamWriter , which writes characters to a stream in a particular encoding. The example reads a text file and prints its contents. We read the data as bytes, transform them into strings using UTF8 encoding and finally, write the strings to the console. With File. OpenRead we open a file for reading. The method returns a FileStream.

The FileStream's Read method reads a block of bytes from the stream and writes the data in a given buffer. The first argument is the byte offset in array at which the read bytes will be placed.