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Because BLOBs can be very large in size compared to the data items typically handled by RDBMS systems, they pose special problems in several areas: I Data storage and optimization. Storing a BLOB item in-line with the other contents of a table s row would destroy the optimization that the DBMS performs to fit database data neatly into pages that match the size of disk pages. For this reason, BLOB data is always stored out-of-line in separate storage areas. Most DBMS brands that support BLOBs provide special BLOB storage options, including named storage spaces that are specified when the BLOB type column is created. I Storing BLOB data in the database. Because a BLOB can be tens or hundreds of megabytes in size, most programs can t hold the entire contents of a BLOB in a memory buffer at once. They process portions of the BLOB at a time (for example, pages of a long document or individual frames of a video clip). But Embedded SQL and normal SQL APIs are designed for row-at-a-time processing (through INSERT and UPDATE statements) that store the values for all columns in the row at once. Special techniques are required to put data into a database BLOB column piece by piece, through multiple API calls per BLOB column.
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I Retrieving BLOB data from the database. This is the same issue as retrieving the data, but in reverse. Embedded SQL and normal SQL APIs are designed for SELECT statement or FETCH statement processing that retrieves data values for all columns of a row at once. But because a stored BLOB value can be tens or hundreds of megabytes in size, most programs can t possibly process it all at once in a memory buffer. Special techniques are required to retrieve the database BLOB column data, piece by piece, so that it can be processed by the application. I Transaction logging. Most DBMS s support transactions by maintaining before and after images of modified data in a transaction log. Because of the potentially large size of BLOB data, the logging overhead could be extreme. For this reason, many DBMS s don t support logging for BLOB data, or they allow logging but provide the ability to turn it on and off. Several DBMS s address these issues through extended APIs that specifically support BLOB manipulation. These calls provide random access to individual segments of the BLOB contents, allowing the program to retrieve or store the BLOB in manageable chunks. Oracle8 introduced this capability for manipulating its LOB data types (character and binary) within stored procedures written in the Oracle PL/SQL language. Its capabilities are similar to those provided by other object-relational databases, such as Informix Universal Server. When a stored procedure reads an Oracle LOB column from a table, Oracle does not actually return the contents of the column. Instead, a locator for the LOB data (in object parlance, a handle for the LOB) is returned. The locator is used in conjunction with a set of nine special LOB-processing functions that the stored procedure can then use to manipulate the actual data stored in the LOB column of the database. Here is a brief description of each LOB-processing function: I dbms_lob.read(locator, length, offset, buffer). Reads into the PL/SQL buffer the indicated number of bytes/characters from the LOB identified by the locator, starting at the offset. I dbms_lob.write(locator, length, offset, buffer). Writes the indicated number of bytes/characters from the PL/SQL buffer into the LOB identified by the locator, starting at the offset. I dbms_lob.append(locator1, locator2). Appends the entire contents of the LOB identified by locator2 to the end of the contents of the LOB identified by locator1. I dbms_lob.erase(locator, length, offset). Erases the contents of the LOB identified by the locator at offset for length bytes/characters; for character-based LOBs, spaces are inserted, and for binary LOBs, binary zeroes are inserted. I dbms_lob.copy(locator1, locator2, length, offset1, offset2). Copies length bytes/characters from the LOB identified by locator2 at offset2 into the LOB identified by locator1 at offset1.
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