What does Nocopy mean in Oracle?

What does Nocopy mean in Oracle?

Pass By Reference : Using the NOCOPY hint tells the compiler to use pass by reference, so no temporary buffer is needed and no copy forward and copy back operations happen. Instead, any modification to the parameter values are written directly to the parameter variable (actual parameter).

What is Nocopy clause where it is used in Oracle?

NOCOPY Parameter in Oracle Procedure is used to pass arguments to the any procedure and function as Reference to improve the performance of the code. This is done in case the arguments like records, pl/sql tables are passed to the called procedures.

What does Dbms_lob Getlength do?

The DBMS_LOB package provides subprograms to operate on BLOBs , CLOBs , NCLOBs , BFILEs , and temporary LOBs. You can use DBMS_LOB to access and manipulation specific parts of a LOB or complete LOBs….Summary of DBMS_LOB Subprograms.

What is Utl_raw Cast_to_raw?

UTL_RAW . CAST_TO_RAW converts a value of data type VARCHAR2 into a raw value with the same number of bytes. The input value is treated as if it were composed of single 8-bit bytes, not characters.

What is no copy?

The NOCOPY hint allows the PLSQL compiler to pass OUT and IN OUT parameters by reference rather than by value. The reason behind passing the parameters by reference is to improve the performance of PL SQL code. It reduces the overhead of passing parameters. NOCOPY hint.

What is call by value and call by reference in Oracle?

call by value: a copy of the parameter is passed into the procedure, which gets copied back when the procedure completes (IN OUT and OUT parameters) call by reference: IN parameters. with the NOCOPY hint you can have IN OUT and OUT parameters behave as call by reference parameters.

What is BLOB size?

A BLOB (binary large object) is a varying-length binary string that can be up to 2,147,483,647 characters long.

What is DBMS_LOB Createtemporary?

n createtemporary: The procedure createtemporary creates a temporary CLOB or BLOB and its corresponding index in the user default temporary tablespace. n instr: Used to return the matching position of the nth occurrence of the pattern in the LOB. n getlength: Used to get the length of specified LOB.

What is Utl_raw CAST_TO_VARCHAR2?

UTL_RAW. CAST_TO_VARCHAR2 converts a raw string into a varchar2 data type.

What is Dbms_crypto?

DBMS_CRYPTO provides an interface to encrypt and decrypt stored data, and can be used in conjunction with PL/SQL programs running network communications. It provides support for several industry-standard encryption and hashing algorithms, including the Advanced Encryption Standard (AES) encryption algorithm.

What is collection in Oracle with example?

PL/SQL – Collections