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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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Because LOBs can be very large compared with the data items typically handled by RDBMS systems, they pose special problems in several areas: Data storage and optimization Storing a LOB item inline 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, LOB data is nearly always stored out-of-line in separate storage areas. Most DBMS brands that support LOBs provide special LOB storage options, including named storage spaces that are specified when the LOB type column is created. Storing LOB data in the database Because a LOB can be tens or hundreds of megabytes in size, most programs can t hold the entire contents of a LOB in a memory buffer at once. They process portions of the LOB 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 stores the values for all columns in the row at once. Special techniques are required to put data into a database LOB column piece by piece, through multiple API calls per LOB column. Retrieving LOB data from the database This is the same issue as storing 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 LOB 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 LOB column data, piece by piece, so that it can be processed by the application. Transaction logging Most DBMSs support transactions by maintaining before and after images of modified data in a transaction log. Because of the potentially large size of LOB data, the logging overhead could be extreme. For this reason, many DBMSs don t support logging for LOB data, or they allow logging but provide the ability to turn it on and off. Several DBMSs address these issues through extended APIs that specifically support LOB manipulation. These calls provide random access to individual segments of the LOB contents, allowing the program to retrieve or store the LOB in manageable chunks. Oracle8 introduced this capability for manipulating its LOB data types 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 more than 35 special LOB-processing functions that the stored procedure DBMS_LOB can then use
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to manipulate the actual data stored in the LOB column of the database. Here is a brief description of some of LOB-processing functions available in the DBMS_LOB stored procedure: 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. 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. 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. DBMS_LOB.ERASE(locator, length, offset) Erases the contents of the LOB identified by the locator at offset for length bytes/characters; for characterbased LOBs, spaces are inserted, and for binary LOBs, binary zeroes are inserted. 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. DBMS_LOB.TRIM(locator, length) Trims the LOB identified by the locator to the indicated number of bytes/characters. DBMS_LOB.SUBSTR(locator, length, offset) Returns (as a text string return value) the indicated number of bytes/characters from the LOB identified by the locator, starting at the offset; the return value from this function may be assigned into a PL/SQL VARCHAR variable. DBMS_LOB.GETLENGTH(locator) Returns (as an integer value) the length in bytes/characters of the LOB identified by the locator. DBMS_LOB.COMPARE(locator1, locator2, length, offset1, offset2) Compares the LOB identified by locator1 to the LOB identified by locator2, starting at offset1 and offset2, respectively, for length bytes/ characters; returns zero if they are the same and nonzero if they are not. DBMS_LOB.INSTR(locator, pattern, offset, i) Returns (as an integer value) the position within the LOB identified by the locator where the ith occurrence of pattern is matched; the returned value may be used as an offset in subsequent LOB processing calls. Oracle imposes one further restriction on updates and modifications to LOB values that are performed through these functions. LOBs can impose an unacceptably high overhead on Oracle s transaction mechanisms, so Oracle normally does not lock the contents of a LOB data item when the row containing the LOB is read by an application program or a PL/SQL routine. If the LOB data is to be updated, the row must be explicitly locked prior to modifying it. This is done by including a FOR UPDATE clause in the SELECT statement that retrieves the LOB locator. Here is a PL/SQL fragment that
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