Download Oracle9i Application Developer's Guide - Large Objects by Higgins S., Kotsovolos S., Raphaely D. PDF

By Higgins S., Kotsovolos S., Raphaely D.

Oraclc9i program Developer's Guide-Large items (LOBs) includes details that describes the positive aspects and performance of Oracle9i and Oracle9i company variation items. Oracle9i and Oracle9i firm version have a similar easy positive aspects. besides the fact that, a number of complex beneficial properties can be found simply with the company variation, and a few of those are non-compulsory. to take advantage of the Partitioning performance, pick out the Partitioning alternative.

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Additional resources for Oracle9i Application Developer's Guide - Large Objects (LOBs) using Visual Basic (0040)

Sample text

This includes SQL, PL/SQL, OCI, PRO*C, DBMS_LOB, and so on. For varying-width CLOB data you need to also consider whether the parameters are specified in characters or bytes. ■ If the database CHAR character set is varying-width then the CLOB is stored in ucs2 (utf-16). 1) Varying-Width Character Data ■ If the database NCHAR character set is varying-width then the NCLOB is stored as ucs2 (utf-16). Otherwise, the CLOB/NCLOB is stored in the database char/nchar character set respectively. UTF-16 has same encoding as UCS2, but UTF-16 treats a surrogate pair as one character.

1) SQL Semantics Support for LOBs LOB Columns Note: LOBs can also be object attributes. LOB (BLOB, CLOB, NCLOB, or BFILE) column types store values or references, called locators. Locators specify the location of large objects. LOB Columns Do Not Only Store Locators! In LOB columns, the LOB locator is stored in-line in the row. Depending on the user-specified SQL Data Definition Language (DDL) storage parameters, Oracle9i can store small LOBs, less than approximately 4K in-line in the table. Once the LOB grows bigger than approximately 4K Oracle9i moves the LOB out of the table into a different segment and possibly even into a different tablespace.

Unstructured Data" is described earlier in this chapter. Examples in this manual use a Multimedia schema based on table Multimedia_tavb. Where applicable, any deviations or extensions to this table are described where appropriate. 1) 2 Basic LOB Components This chapter discusses the following topics: ■ ■ The LOB Datatype ■ Internal LOBs ■ External LOBs (BFILEs) ■ Internal LOBs Use Copy Semantics, External LOBs Use Reference Semantics ■ Varying-Width Character Data LOB Value and Locators ■ ■ Setting the LOB Column/Attribute to Contain a Locator Creating Tables that Contain LOBs ■ Initializing Internal LOBs to NULL or Empty ■ Initializing Internal LOB Columns to a Value ■ Initializing External LOBs to NULL or a File Name Basic LOB Components 2-1 The LOB Datatype The LOB Datatype Oracle9i regards LOBs as being of two kinds depending on their location with regard to the database — internal LOBs and external LOBs, also referred to as BFILEs (binary files).

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