Why do we use CLOB in Oracle?
A CLOB (character large object) value can be up to 2,147,483,647 characters long. A CLOB is used to store unicode character-based data, such as large documents in any character set.
How do I create a CLOB table in Oracle?
Type an “ALTER TABLE” command to add a CLOB item to an existing table, using the following SQL code as a guide: ALTER TABLE your_table ( add big_text_field CLOB ); Press “Enter” to execute the command. Here, “your_table” is the name of a database table to which you want a CLOB field added.
How do you put more than 4000 characters into CLOB?
3 Answers
- split the long character string into 4000 character or less chunks.
- create clobs for each chunk using to_clob() function.
- concatenate the clobs.
How does Oracle handle CLOB data types?
In Oracle, you can use LENGTH() or DBMS_LOB. GETLENGTH() function to get the length of a CLOB column in characters. There is LENGTHB() function to get the length in bytes, but it can be used for single-byte CLOBs only, so it will return the same result as LENGTH().
What is CLOB argument in Oracle 11g?
Oracle 11g allows the usage of CLOB datatypes as an argument which eradicates the constraint we faced on the length of strings when passed as an argument to Execute immediate. Lets take an example to show how execute immediate failed for strings of size > 32K
Does execute immediate support SQL strings stored in CLOB?
Now Both Native Dynamic SQL and DBMS_SQL support SQL strings stored in CLOBs. But using DBMS_SQL has an overload of PARSE that accepts a collection of SQL string fragments. This is not ideal and the CLOB implementation in EXECUTE IMMEDIATE solves any issues we might have had with the previous alternatives.
What is execute immediate in Oracle 11g?
We know that Oracle EXECUTE IMMEDIATE statement implements Dynamic SQL in Oracle. It provides end-to-end support when executing a dynamic SQL statement or an anonymous PL/SQL block. Before Oracle 11g, EXECUTE IMMEDIATE supported SQL string statements up to 32K in length.