What is CLOB and Nclob?

The CLOB (Character Large Object) and NCLOB (National Character Large Object) types can store character data. These data types are commonly used to store large text and XML files. The BLOB (Binary Large Object) type can store data in binary format.

What is CLOB and BLOB datatype in Oracle?

BLOB : Variable-length binary large object string that can be up to 2GB (2,147,483,647) long. CLOB : Variable-length character large object string that can be up to 2GB (2,147,483,647) long. A CLOB can store single-byte character strings or multibyte, character-based data. A CLOB is considered a character string.

What is CLOB datatype in Oracle with example?

In Oracle, CLOB data type stores variable-length character data (character large object) in the database character set that can be single-byte or multibyte (supports more than 4 GB ). In SQL Server, you can use VARCHAR(max) or NVARCHAR(max) to store stores variable-length character data up to 2 GB .

What is Oracle Bfile?

BFILE is an Oracle proprietary data type that provides read-only access to data located outside the database tablespaces on tertiary storage devices, such as hard disks, network mounted files systems, CD-ROMs, PhotoCDs, and DVDs. BFILE data is not under transaction control and is not stored by database backups.

Which are the types of large objects?

The large object data types can be classified in two categories:

  • Simple large objects: TEXT and BYTE.
  • Smart large objects: CLOB and BLOB.

Why do we use CLOB in Oracle?

Stands for “Character Large Object.” A CLOB is a data type used by various database management systems, including Oracle and DB2. It stores large amounts of character data, up to 4 GB in size. Since CLOB data may be very large, some database management systems do not store the text directly in the table.

What is a blob in Oracle?

A BLOB (Binary Large Object) is an Oracle data type that can hold up to 4 GB of data. BLOB’s are handy for storing digitized information (e.g., images, audio, video).

What is Alter tablespace in Oracle?

The ALTER TABLESPACE statement is used to modify a tablespace or one of its data files or temp files. A tablespace is used to allocate space in the Oracle database where schema objects are stored.

What’s the difference between nclob and CLOB in SQL?

CLOB can store up to 4 gigabytes of character data. The NCBLOB data type stores character large objects in multibyte national character set. NCLOB can store up to 4 gigabytes of character data. The BFILE data type enables access to binary file LOBs that are stored in file systems outside the Oracle database.

How much data can be stored in nclob?

NCLOB can store up to 4 gigabytes of character data. The BFILE data type enables access to binary file LOBs that are stored in file systems outside the Oracle database.

What’s the difference between a cblob and a CLOB?

BLOB can store up to 4 gigabytes of binary data. The CBLOB data type stores character large objects. CLOB can store up to 4 gigabytes of character data. The NCBLOB data type stores character large objects in multibyte national character set.

How are persistent lobs used in the database?

Persistent LOBs use copy semantics and participate in database transactions. You can recover persistent LOBs in the event of transaction or media failure, and any changes to a persistent LOB value can be committed or rolled back.