How do you use CICS ISSUE RETRIEVE?

Use CICS ISSUE RETRIEVE with RESP parameters to check response codes and handle any errors appropriately.

What are the different types of retrieves?

Retrieve types include basic retrieves (standard, mapped, unmapped, custom), advanced retrieves (advanced, secure, encrypted, compressed), and specialized retrieves (specialized, high-performance, low-latency, high-throughput).

When should you use CICS ISSUE RETRIEVE?

Use CICS ISSUE RETRIEVE when building applications that need to issue retrieve operations, when implementing retrieve management, when issuing retrieves, when building retrieve systems, or when implementing retrieve functionality.

CICS ISSUE RETRIEVE - Issue Retrieve

CICS ISSUE RETRIEVE issues a retrieve operation, enabling retrieve management and output processing in CICS environments. It provides efficient retrieve capabilities for CICS applications.

What is CICS ISSUE RETRIEVE?

CICS ISSUE RETRIEVE issues a retrieve operation, enabling retrieve management and output processing. It provides efficient retrieve capabilities, allowing applications to issue retrieve operations.

Command Syntax

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EXEC CICS ISSUE RETRIEVE
    [RESP(response-code)]
    [RESP2(response-code-2)]
END-EXEC.

Parameters Explained

RESP Parameters

Response codes returned by the command:

RESP: Primary response code - indicates the success or failure of the retrieve operation
RESP2: Secondary response code - provides additional error information when RESP indicates failure
Always check these codes for command success before proceeding with data processing
Handle command failures appropriately to prevent application errors

Retrieve Types

1. Basic Retrieves

Basic retrieves: Standard retrieve operations that handle simple data retrieval without special formatting
Mapped retrieves: Retrieve operations that use predefined field mappings to structure retrieved data
Unmapped retrieves: Raw retrieve operations that handle unstructured data retrieval without predefined field mappings
Custom retrieves: Specialized retrieve operations designed for specific application requirements

2. Advanced Retrieves

Advanced retrieves: Complex retrieve operations that handle sophisticated data processing and validation
Secure retrieves: Retrieve operations that include encryption and security features for sensitive data
Encrypted retrieves: Retrieve operations that automatically decrypt retrieved data
Compressed retrieves: Retrieve operations that handle compressed data streams and automatically decompress retrieved data

3. Specialized Retrieves

Specialized retrieves: Retrieve operations tailored for specific protocols or communication methods
High-performance retrieves: Optimized retrieve operations designed for maximum throughput and efficiency
Low-latency retrieves: Retrieve operations optimized for minimal delay and real-time processing requirements
High-throughput retrieves: Retrieve operations designed to handle large volumes of data efficiently

Implementation Example

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WORKING-STORAGE SECTION.
01 WS-RESPONSE            PIC S9(8) COMP.
01 WS-RESPONSE2           PIC S9(8) COMP.
 
PROCEDURE DIVISION.
    * Issue retrieve
    EXEC CICS ISSUE RETRIEVE
        RESP(WS-RESPONSE)
        RESP2(WS-RESPONSE2)
    END-EXEC.
    
    IF WS-RESPONSE NOT EQUAL DFHRESP(NORMAL)
        EXEC CICS WRITE OPERATOR
            TEXT('ISSUE RETRIEVE command failed')
        END-EXEC
        EXEC CICS RETURN END-EXEC
    END-IF.
    
    * Retrieve issued successfully
    * Continue processing

Retrieve Processing

1. Retrieve Preparation

Retrieve preparation includes:

Retrieve validation - ensuring the retrieve operation is properly configured and authorized
Retrieve formatting - preparing data structures and buffers for retrieved data
Retrieve encoding - setting up proper character encoding and data transformation
Retrieve processing - initializing the retrieve operation and preparing for data retrieval

2. Retrieve Transmission

Retrieve transmission includes:

Retrieve routing - directing retrieve requests to the appropriate processing location
Retrieve delivery - ensuring retrieved data reaches the correct destination within the application
Transmission confirmation - verifying that retrieval was completed successfully
Error handling - managing transmission failures and implementing retry mechanisms

3. Output Management

Output management includes:

User management - handling user sessions and maintaining connection state
Output formatting - structuring retrieved data for presentation or further processing
User experience - ensuring smooth data flow and responsive application behavior
Performance optimization - maximizing retrieve efficiency and minimizing resource usage

Common Response Codes

Success Response Codes

NORMAL (0): Retrieve issued successfully - data was retrieved without errors
RETRIEVE (4): Retrieve issued - operation completed with retrieve-specific status

Error Response Codes

INVREQ (16): Invalid request - the retrieve operation parameters are incorrect or unauthorized
NOTFND (20): Resource not found - the specified retrieve resource does not exist
LENGERR (22): Length error - the retrieved data length exceeds expected limits
RETRIEVE (24): Retrieve error - a retrieve-specific error occurred during the operation

Best Practices

1. Retrieve Preparation

Prepare retrieve appropriately - ensure all necessary resources and configurations are in place
Validate retrieve content - verify that retrieved data meets expected format and quality standards
Handle different retrieve types - implement flexible processing to accommodate various data formats
Ensure retrieve integrity - maintain data consistency and prevent corruption during retrieval

2. Error Handling

Check all response codes - always examine both RESP and RESP2 for complete error information
Handle retrieve failures - implement appropriate recovery mechanisms for failed retrieve operations
Implement retry logic - provide automatic retry capabilities for transient failures
Log error conditions - maintain detailed logs for troubleshooting and monitoring purposes

3. Performance Optimization

Minimize retrieve operations - reduce unnecessary retrieve calls to improve overall performance
Use efficient retrieve formats - choose appropriate data formats to minimize processing overhead
Optimize user updates - streamline user interface updates to reduce response time
Manage user resources - efficiently allocate and manage system resources for retrieve operations

Explain It Like I'm 5 Years Old

Imagine you're getting a toy from a toy box:

When you want to get a toy from a toy box, you reach in and take out the toy you want. If you find the toy, you can play with it. If you don't find the toy, you have to look somewhere else.

CICS ISSUE RETRIEVE is like getting a toy from a toy box. The computer program reaches in and takes out the data it wants. If it finds the data, the program can use it. If it doesn't find the data, the program has to look somewhere else.

Just like you get toys from toy boxes, the computer program gets data from storage!

Exercises

Exercise 1: Retrieve Issuance

Write a CICS ISSUE RETRIEVE command to issue a retrieve operation.

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EXEC CICS ISSUE RETRIEVE
    RESP(WS-RESPONSE)
    RESP2(WS-RESPONSE2)
END-EXEC.

Exercise 2: Retrieve Processing

How would you implement comprehensive retrieve processing that handles different retrieve types and requirements?

Answer: Identify different retrieve types and appropriate handling, implement retrieve validation and encoding, handle different retrieve types and capabilities, implement proper error handling for retrieve failures, optimize retrieve operations for performance, and maintain retrieve integrity throughout the process.

Quiz

Question 1

What is the primary purpose of CICS ISSUE RETRIEVE?

A) To format retrievesB) To issue a retrieve operationC) To validate retrievesD) To edit retrieves

Answer: B) To issue a retrieve operation

Question 2

Which parameter specifies the response code?

A) RESPB) RESPONSEC) CODED) RETRIEVE

Answer: A) RESP

CICS ISSUE RETRIEVE - Issue Retrieve

What is CICS ISSUE RETRIEVE?

Command Syntax

Parameters Explained

RESP Parameters

Retrieve Types

1. Basic Retrieves

2. Advanced Retrieves

3. Specialized Retrieves

Implementation Example

Retrieve Processing

1. Retrieve Preparation

2. Retrieve Transmission

3. Output Management

Common Response Codes

Success Response Codes

Error Response Codes

Best Practices

1. Retrieve Preparation

2. Error Handling

3. Performance Optimization

Explain It Like I'm 5 Years Old

Exercises

Exercise 1: Retrieve Issuance

Exercise 2: Retrieve Processing

Quiz

Question 1

Question 2

Related Concepts

CICS Retrieve Processing

CICS User Management

CICS Output Processing

Related Pages