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LOBs have special storage requirements, and may even reside outside of normal table spaces. So, if your existing CLOB data values are less than 32K, it probably makes sense to consider a data conversion as part of your Oracle 12c upgrade.This will be especially true for CLOB data that is inserted, updated, or manipulated frequently.
DEFAULT_LANG_CTX; warning number; BEGIN DBMS_OUTPUT. ENABLE(100000); — ———————————————————————– — THE FOLLOWING BLOCK OF CODE WILL ATTEMPT TO INSERT / WRITE THE CONTENTS — OF AN XML FILE TO A CLOB COLUMN. Load CLOBFrom File() API WHICH *DOES* SUPPORT MULTI-BYTE — CHARACTER SET DATA.
With some MSSQL and My SQL skills, I did some reading up on how Oracle can manipulate CLOB/LOB Columns using DBMS_LOB.
The result is a simple SQL Statement that results in an SQL UPDATE statement, which updates a column, with XML located in /directory/to/ Create Directory Object To start with, you’ll need to place the XML file in a directory and create the File Handler in Oracle for use later.
One reason you may want to use NVARCHAR2 is that your DB uses a non-Unicode character set, and you still want to be able to store Unicode data for some columns without changing the primary character set. According to analysis performed on numerous Internet sites, the average word length in English text is about five characters.
Another reason may be that you want to use two Unicode character sets (AL32UTF8 for data that comes mostly from western Europe, and AL16UTF16 for data that comes mostly from Asia for example) with each one being stored in the most efficient manner in columns of the appropriate data type. Although many words are longer, shorter words are used much more frequently.