What is it exactly a BLOB in a DBMS context

Question

What is it a BLOB  How can I use it  What are the differences between DBMS s BLOBs  I would like to save data using BLOBs into any DBMS and then read that BLOB with a library

User · Answer

A BLOB is a Binary Large OBject  It is used to store large quantities of binary data in a database   You can use it to store any kind of binary data that you want  includes images  video  or any other kind of binary data that you wish to store   Different DBMSes treat BLOBs in different ways  you should read the documentation of the databases you are interested in to see how  and if  they handle BLOBs

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This may seem like a silly question  but what do you actually want to use a RDBMS for    If you just want to store files  then the operating system s filesystem is generally adequate  An RDBMS is generally used for structured data and  except for embedded ones like SQLite  handling concurrent manipulation of that data  locking etc   Other useful features are security  handling access to the data  and backup recovery  In the latter  the primary advantage over a regular filesystem backup is being able to recover to a point in time between backups by applying some form of log files   BLOBs are  as far as the database concerned  unstructured and opaque  Oracle does have some specific ORDSYS types for multi-media objects  eg images  that also have a bunch of metadata attached  and have associated methods  eg rescaling or recolouring an image

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They are binary large objects  you can use them to store binary data such as images or serialized objects among other things

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I won t expand the acronym yet again    but I will add some nuance to the other definition  you can store any data in a blob regardless of other byte interpretations they may have  Text can be stored in a blob  but you would be better off with a CLOB if you have that option   There should be no differences between BLOBS across databases in the sense that after you have saved and retrieved the data it is unchanged     how each database achieves that is a blackbox and thankfully almost without exception irrelevant  The manner of interacting with BLOBS  however can be very different since there are no specifications in SQL standards  or standards in the specifications   for it  Usually you will have to invoke procedures functions to save retrieve them  and limiting any query based on the contents of a BLOB is nearly impossible if not prohibited   Among the other stuff enumerated as binary data  you can also store binary representations of text -  character codes with a given encoding    without actually knowing or specifying the encoding used   BLOBS are the lowest common denominators of storage formats

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any large single block of data stored in a database  such as a picture or sound file  which does not include record fields  and cannot be directly searched by the database s search engine

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I think of it as a large array of binary data  The usability of BLOB follows immediately from the limited bandwidth of the DB interface  it is not determined by the DB storage mechanisms  No matter how you store the large piece of data  the only way to store and retrieve is the narrow database interface  The database is a bottleneck of the system  Why to use it as a file server  which can easily be distributed  Normally you do not want to download the BLOB  You just want the DB to store your BLOB urls  Deposite the BLOBs on a separate file server  Then  you reliefe the precious DB connection and provide unlimited bandwidth for large objects  This creates some issue of coherence though

User · Answer

BLOB     BLOB  Binary Large Object  is a large object data type in the database system  BLOB could store a large chunk of data  document types and even media files like audio or video files  BLOB fields allocate space only whenever the content in the field is utilized  BLOB allocates spaces in Giga Bytes     USAGE OF BLOB     You can write a binary large object  BLOB  to a database as either binary or character data  depending on the type of field at your data source  To write a BLOB value to your database  issue the appropriate INSERT or UPDATE statement and pass the BLOB value as an input parameter  If your BLOB is stored as text  such as a SQL Server text field  you can pass the BLOB as a string parameter  If the BLOB is stored in binary format  such as a SQL Server image field  you can pass an array of type byte as a binary parameter     A useful link   Storing documents as BLOB in Database - Any disadvantages

[sql] What is it exactly a BLOB in a DBMS context

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