Why Godror Make Oracle ACL Recognizes The Program Name As `main@<hostname> (TNS V1-V3)`?

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Introduction

When working with Oracle databases, especially in containerized environments like Kubernetes (K8s), understanding how the Oracle Authentication Control (ACL) works is crucial. The ACL is a security feature that allows administrators to control access to the database based on various criteria, including the program name. However, when using the godror driver in a Go project, you might encounter issues where the Oracle ACL recognizes the program name as main@<hostname> (TNS V1-V3). In this article, we will delve into the reasons behind this behavior and provide guidance on how to resolve the issue.

Understanding Oracle ACL and Godror

Oracle ACL is a security feature that allows administrators to control access to the database based on various criteria, including the program name. The ACL is a list of rules that define which programs can connect to the database and what privileges they have. When a program connects to the database, the Oracle client checks the ACL to determine if the program is allowed to connect.

The godror driver is a Go package that provides a simple and efficient way to connect to Oracle databases. However, when using the godror driver, you might encounter issues where the Oracle ACL recognizes the program name as main@<hostname> (TNS V1-V3).

Why Does Oracle ACL Recognize the Program Name as main@<hostname> (TNS V1-V3)?

There are several reasons why Oracle ACL might recognize the program name as main@<hostname> (TNS V1-V3):

  • TNS V1-V3: The TNS V1-V3 part of the program name is related to the Oracle TNS (Transparent Network Substrate) protocol version. The TNS protocol is used by Oracle clients to connect to the database. The V1-V3 part indicates that the client is using the TNS protocol version 1 to 3.
  • Hostname: The <hostname> part of the program name is the hostname of the machine where the client is running. In a containerized environment like K8s, the hostname of the machine can change frequently.
  • Program Name: The main part of the program name is the name of the program that is connecting to the database. In a Go project, the program name is usually set to main.

Resolving the Issue

To resolve the issue where the Oracle ACL recognizes the program name as main@<hostname> (TNS V1-V3), you can try the following:

  • Use a fixed hostname: If you are using a containerized environment like K8s, you can set a fixed hostname for the machine using the hostname command.
  • Use a custom program name: You can set a custom program name using the oracle.dsn parameter in the godror driver. For example: oracle.dsn = "username/password@//localhost:1521/service_name?program_name=my_program"
  • Use a different TNS protocol version: You can try using a different TNS protocol version by setting the oracle.tns parameter in the godror driver. For example: oracle.tns = "V4"

Example Code

Here is an example of how to use the godror driver to connect to an Oracle database with a custom program name:

package main

import (
	"database/sql"
	"fmt"
	"log"

	"github.com/godror/godror"
)

func main() {
	// Set the Oracle DSN
	oracle.dsn = "username/password@//localhost:1521/service_name?program_name=my_program"

	// Create a new Oracle connection
	db, err := sql.Open("oracle", oracle.dsn)
	if err != nil {
		log.Fatal(err)
	}

	// Ping the database to test the connection
	err = db.Ping()
	if err != nil {
		log.Fatal(err)
	}

	// Query the database
	rows, err := db.Query("SELECT * FROM my_table")
	if err != nil {
		log.Fatal(err)
	}

	// Print the results
	for rows.Next() {
		var (
			column1 string
			column2 string
		)
		err = rows.Scan(&column1, &column2)
		if err != nil {
			log.Fatal(err)
		}
		fmt.Printf("%s %s\n", column1, column2)
	}
}

Conclusion

In this article, we discussed why Oracle ACL might recognize the program name as main@<hostname> (TNS V1-V3) and provided guidance on how to resolve the issue. We also provided an example of how to use the godror driver to connect to an Oracle database with a custom program name. By following the steps outlined in this article, you should be able to resolve the issue and connect to your Oracle database successfully.

Introduction

In our previous article, we discussed why Oracle ACL might recognize the program name as main@<hostname> (TNS V1-V3) and provided guidance on how to resolve the issue. However, we understand that you may still have questions about Oracle ACL and Godror. In this article, we will answer some of the most frequently asked questions about Oracle ACL and Godror.

Q: What is Oracle ACL?

A: Oracle ACL (Authentication Control) is a security feature that allows administrators to control access to the database based on various criteria, including the program name.

Q: Why does Oracle ACL recognize the program name as main@<hostname> (TNS V1-V3)?

A: Oracle ACL recognizes the program name as main@<hostname> (TNS V1-V3) because of the way the TNS (Transparent Network Substrate) protocol version is handled. The TNS V1-V3 part of the program name indicates that the client is using the TNS protocol version 1 to 3.

Q: How can I resolve the issue where Oracle ACL recognizes the program name as main@<hostname> (TNS V1-V3)?

A: To resolve the issue, you can try using a fixed hostname, a custom program name, or a different TNS protocol version.

Q: What is the difference between TNS V1-V3 and TNS V4?

A: TNS V1-V3 and TNS V4 are different versions of the Oracle TNS protocol. TNS V1-V3 is an older version that is still supported by Oracle, while TNS V4 is a newer version that provides additional features and improvements.

Q: How can I set a custom program name using the godror driver?

A: You can set a custom program name using the oracle.dsn parameter in the godror driver. For example: oracle.dsn = "username/password@//localhost:1521/service_name?program_name=my_program"

Q: What is the oracle.tns parameter in the godror driver?

A: The oracle.tns parameter in the godror driver is used to specify the TNS protocol version to use. For example: oracle.tns = "V4"

Q: Can I use a different TNS protocol version with the godror driver?

A: Yes, you can use a different TNS protocol version with the godror driver by setting the oracle.tns parameter.

Q: How can I troubleshoot issues with Oracle ACL and Godror?

A: To troubleshoot issues with Oracle ACL and Godror, you can try checking the Oracle error logs, the godror driver logs, and the application logs for any errors or warnings.

Q: What are some best practices for using Oracle ACL and Godror?

A: Some best practices for using Oracle ACL and Godror include:

  • Using a fixed hostname to avoid issues with hostname changes
  • Setting a custom program name to avoid issues with default program names
  • Using a different TNS protocol version to take advantage of new features and improvements
  • Checking the Oracle error logs, the godror driver logs, and the application logs for any errors or warnings

Conclusion

In this article, we answered some of the most frequently asked questions about Oracle ACL and Godror. We hope that this article has provided you with the information you need to resolve any issues you may be experiencing with Oracle ACL and Godror. If you have any further questions, please don't hesitate to contact us.