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The first approach to supporting BLOBs in relational databases was through the underlying operating system and its file system. Each individual BLOB data item was stored in its own operating system file. The name of the file was placed in a character-valued column within a table, as a pointer to the file. The table s other columns could be searched to find rows that met certain criteria. When an application needed to manipulate the BLOB content associated with one of the rows, it read the name of the file and retrieved the BLOB data from it. Management of the file input/output was the responsibility of the application program. This approach worked, but it was error-prone and required that a programmer understand both the RDBMS and the file system interfaces. The lack of integration between the BLOB contents and the database was readily apparent. For example, you couldn t ask the database to compare two BLOB data items to see if they were the same, and the database couldn t provide even basic text searching capability for BLOB contents. Today, most major enterprise-class DBMS systems provide direct support for one or more types of BLOB data. You can define a column as containing one of these BLOB data types and use it in certain situations in SQL statements. There are typically substantial restrictions on the BLOB data, such as not allowing its use in a join condition or a GROUP BY clause. Sybase provides two large object data types. Its TEXT data type can store up to 2 billion bytes of variable-length text data. You can use a limited set of SQL capabilities (such as the LIKE text-search operator) to search the contents of TEXT columns. A companion IMAGE data type can store up to 2 billion bytes of variable-length binary data. Microsoft SQL Server supports these types, plus an NTEXT data type that allows up to 1 billion characters of 2-byte national language text. IBM s DB2 provides a similar set of data types. A DB2 character large object (CLOB) type stores up to 2 billion bytes of text. A DB2 double-byte character large object (DBCLOB) type stores up to 1 billion 2-byte characters. A DB2 binary large object (BLOB) stores up to 2 billion bytes of binary data. Oracle historically provided two large object data types. A LONG data type stored up to 2 billion bytes of text data. A LONG RAW data type stored up to 2 billion bytes of binary data. Oracle restricted the use of either LONG type to only a single column per table. With the introduction of Oracle8, support for BLOB data was expanded substantially: I An Oracle BLOB type stores up to 4 gigabytes of binary data within the database. I An Oracle CLOB type stores up to 4 gigabytes of single-byte character data within the database. I An Oracle NCLOB type stores multibyte character data as a BLOB. I An Oracle BFILE type stores long binary data in a file external to the database.
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The BLOB, CLOB, and NCLOB types are tightly integrated into Oracle s operation, including transaction support. BFILE data is managed through a pointer within the database to an external operating system file. It is not supported by Oracle transaction semantics. Special Oracle PL/SQL functions are provided to manipulate BLOB, CLOB, and NCLOB data from within PL/SQL stored procedures, as described in the next section. Informix Universal Server s support for large object data is similar to that of Oracle. It supports simple large objects and smart large objects: I An Informix BYTE type is a simple large object that stores binary data. I An Informix TEXT type is a simple large object that stores text data. I An Informix BLOB type is a smart large object that stores binary data. I An Informix CLOB type is a smart large object that stores text (character) data. Informix simple large objects store up to 1 gigabyte of data. The entire large object must be retrieved or stored as a unit from the application program, or it can be copied between the database and an operating system file. Smart large objects can store up to 4 terabytes of data. Special Informix functions are provided to process smart large objects in smaller, more manageable chunks. These functions provide random access to the contents of an Informix smart object, similar to the random access typically provided for operating system files. Informix also provides advanced controls over logging, transaction management, and data integrity for smart large objects.
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