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User Roles

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Important

Change Data Capture for Oracle by Attunity is deprecated now. For details, refer to the announcement.

This section describes the user roles for the Change Data Capture Service for Oracle by Attunity. The roles described are SQL Server database roles, Windows roles, or Oracle database roles.

Windows User Roles

The following describes the Windows user roles used by the Oracle CDC Service.

Computer Administrator: Oracle CDC Service

The computer administrator is a Windows user responsible for creating and maintaining the CDC Service on the computer. This user must belong to the group of local machine administrators.

The tasks performed by the Oracle CDC Service Computer Administrator include:

  • Installing the CDC Service for Oracle software

  • Creating an Oracle CDC Windows service

  • Setting up the CDC Service connection to the target SQL Server instance (connection string and credentials)

  • Ensuring that the CDC Service Master Password with which Oracle log mining credentials are protected

  • Deleting a CDC Service Windows service

  • Uninstalling the CDC Service for Oracle software

  • Maintaining the CDC Service for Oracle software (for example, installing updates)

  • Starting and stopping a CDC Service Windows service

When working with high-availability configurations, such as Microsoft failover clusters, the computer administrator must have additional responsibilities and permissions such as:

  • Installation and maintenance of the CDC Service for Oracle software on all cluster nodes.

  • Defining generic cluster service resources for the CDC Service' Windows service on the various cluster nodes.

  • Acting as the computer administrator authorized as an administrator on the computer where the CDC Service for Oracle is installed. This person installs the CDC Service for Oracle and uses the CDC Service Configuration Console to configure a CDC Service for Oracle on a local computer.

Service Account: Oracle CDC Service

This is Oracle CDC Service Windows Service Account is a Windows account used for running the Oracle CDC Service (the Service Account).

The only required privilege necessary for the service account is to be able to use the Oracle client and the SQL Server native client ODBC provider. This account does not need to access files unless required by specific providers (for example, if the Oracle client connection string references Oracle database instances in a tnsnames.ora file, then that file must be read-accessible to the service account).

When creating an Oracle CDC Service on Windows Vista or Windows Server 2008, the default service account is the NETWORK SERVICE account.

On Windows 7, Windows Server 2008 R2 and later, the default service account is NT Service\\<service-name>.

When SQL Server runs on another machine or is a clustered SQL Server instance and there the service needs to connect to the target SQL Server using Windows authentication, then the service account should be a domain account.

SQL Server User Roles

The following describes the SQL Server user roles used by the Oracle CDC Service.

Oracle CDC Service Administrator

The CDC Service Administrator is a SQL Server user with full control over the Oracle CDC Service artifacts in the target SQL Server instance. The CDC Service Administrator uses the Oracle CDC Designer Console to design Oracle CDC Instances.

The CDC Service Administrator should be granted the SQL Server fixed server roles public and dbcreator.

The tasks performed by the CDC Service Administrator include:

  • Preparing a SQL Server instance to host Oracle CDC Instances (which are SQL Server databases). In this task, a special database called MSXDBCDC is created in the SQL Server instance.

  • Creating an Oracle CDC Instance SQL Server database. Task includes enabling the newly created SQL Server database for CDC, which requires a SQL Server system administrator (sysadmin).

  • Designing an Oracle CDC Instance. This task includes providing information about the source Oracle database and captured tables, which requires an Oracle database administrator.

  • Maintaining the Oracle CDC Instance over time, which includes adding/removing capture instances and updating configuration.

  • Enabling or disabling an Oracle CDC Instance.

  • Monitoring the state of an Oracle CDC Instance.

  • Troubleshooting issues that affect the Oracle CDC Instance.

The CDC Service Administrator is, at least initially, in the db_owner fixed database role for the SQL Server CDC database associated with the Oracle CDC Instance. This gives the CDC Service Administrator access to the change data stored in the CDC database. Once created, the db_owner role of the CDC database can be assigned to a different user who can carry out all of the tasks listed above except for preparing a SQL Server instance and creating another Oracle CDC Instance).

The CDC Service Administrator does not need to know the master password specified with the creation of the Oracle CDC Windows service.

System Administrator

The SQL Server system administrator is a SQL Server user and should be granted the fixed server sysadmin role on the SQL Server instance associated with the Oracle CDC Service(s).

There is only one Oracle CDC specific task that carried out with the SQL Server System Administrator and that is to enable the SQL Server database for an Oracle CDC Instance for SQL Server CDC. This task is performed using the Oracle CDC Designer console when creating a new Oracle CDC Instance.

Oracle CDC Service User

The SQL Server Oracle CDC Service user is a SQL Server login which is used by the Oracle CDC Service to perform its work against the MSXDBCDC and all of the Oracle CDC Instances (CDC databases) handled by this service.

The SQL Server Oracle CDC Service user should be granted the following:

  • Member of the fixed database roles db_dlladmin, db_datareader, and db_datawriter for all CDC databases handled by the server.

  • Member of the fixed database roles db_datareader and db_datawriter for the MSXDBCDC database.

Because the Oracle CDC Service uses a single SQL Server login to work with all CDC databases and the MSXDBCDC database, this login should be mapped in all of these databases.

Oracle CDC Change Consumer

The Oracle CDC Change Consumer is a SQL Server user that consumes changes stored in the CDC tables in the SQL Server Oracle CDC Instance database.

This user determines the user role that is required for accessing each of the CDC tables through the CDC functions generated by the SQL Server CDC infrastructure. If no user role is specified when a capture instance is specified, access to the changes is limited to the member of the db_owner fixed database role of the CDC database.

Oracle User Roles

The following describes the Oracle user roles used by the Oracle CDC Service.

Database Administrator (DBA)

The Oracle database administrator (DBA) is an Oracle database user. The tasks performed by the Oracle DBA include:

  • Setting the source Oracle database to work in ARCHIVELOG mode.

  • Setting up a log mining user with the required permissions.

  • Setting supplemental logging for captured tables.

  • Helping to restore archived transaction log files no longer available so they can be processed.

The Oracle database administrator can get Oracle SQL scripts that need to run so they can be evaluated before running them. The Oracle database administrator can also directly run Oracle SQL scripts from the Oracle CDC Designer console.

If the Oracle database administrator chooses to use the Oracle CDC Designer console, administrator's credentials are not kept except for the context (dialog) in which they were used.

The Oracle database administrator works in coordination with the Oracle CDC Service administrator on the configuration of the SQL Server Oracle CDC Instances.

Log Mining User

The Oracle Log Miner user is a special Oracle database user that is granted the required privileges for accessing and processing the Oracle transaction logs.

The credentials for this user are stored in the SQL Server Oracle CDC Instance database using asymmetric key encryption. They are accessible only to the Oracle CDC Service but not to the SQL Server Oracle CDC Instance database owner.

The following list describes the required privileges of the log mining user should be granted:

  • SELECT on <any-captured-table>

  • SELECT ANY TRANSACTION

  • EXECUTE on DBMS_LOGMNR

  • SELECT on V$LOGMNR_CONTENTS

  • SELECT on V$ARCHIVED_LOG

  • SELECT on V$LOG

  • SELECT on V$LOGFILE

  • SELECT on V$DATABASE

  • SELECT on V$THREAD

  • SELECT on ALL_INDEXES

  • SELECT on ALL_OBJECTS

  • SELECT on DBA_OBJECTS

  • SELECT on ALL_TABLES

If any of these privileges cannot be granted to a V$xxx, then they should be granted to the V $xxx.

Schema User

The Oracle Schema User is an Oracle user with read access to the schema of the Oracle tables to be captured. This user is necessary when working with the Oracle CDC Designer console to retrieve the list of Oracle schema, tables to be captured and their columns, indexes and keys.

The credentials for this user are never stored. They are requested by the CDC Designer console each time they are needed and they are kept for the rest of the UI sessions.