Migrating External Loader Sessions to Dual Load Sessions

Transcription

1 Migrating External Loader Sessions to Dual Load Sessions 2011 Informatica Corporation

2 Abstract You can migrate PowerCenter sessions that load to a Teradata target with external loaders that load to Teradata Dual- Active systems. This article describes how to migrate PowerCenter sessions that load to a Teradata target with external loaders to dual load sessions. Supported Versions PowerCenter PowerExchange for Teradata Parallel Transporter API Table of Contents Overview Converting External Loader Sessions to Dual Load Sessions Teradata Dual Load Connection Creating a Teradata Dual Load Connection Mapping External Loader Properties to TPT API Properties Mapping TPump to Dual Load Mapping Mload to Dual Load Mapping FastLoad to Dual Load Mapping FastExport to TPT API Limitations of Dual Load over External Loaders Converting an External Loader Session to a Dual Load Session Teradata PT API Target Properties Scenario: Migration from Single Loader Session to Dual Load Session Overview PowerCenter supports the following external loaders when you load to Teradata targets: Multiload. Performs insert, update, delete, and upsert operations for large volume incremental loads. TPump. Performs insert, update, delete, and upsert operations for relatively low volume updates. Fastload. Performs insert operations for high volume initial loads, or for high volume truncate and reload operations. The sessions with external loaders cannot load to Teradata Dual Active servers. If you migrate to Teradata Dual Active server, convert your existing PowerCenter sessions that write to a Teradata target to dual load sessions. PowerCenter Dual Load Option for Teradata is a solution based on PowerCenter and PowerExchange for Teradata Parallel Transporter API that helps you to load data to Teradata Dual Active servers. PowerCenter Dual Load Option for Teradata provides Teradata dual load connection that loads data to the Teradata Dual Load server. If you want to migrate to Teradata Dual Active server and retain the existing sessions, replace Teradata loaders with Teradata dual load connection in the session. 2

3 Converting External Loader Sessions to Dual Load Sessions To convert an external loader session to a dual load session: 1. Configure a Teradata Dual Load connection. 2. Create a copy of the session that you want to convert. 3. Create dual load connection object with the same properties used in the external loader configuration. 4. Modify the target connection in the copied session to use the Teradata Dual Load connection. 5. Configure the dual load session properties with the same properties used in the external loader configuration. Teradata Dual Load Connection You must provide a Teradata Dual Load connection to the target instance. A Teradata Dual Load connection loads data to the Teradata Dual Active servers with Teradata PT API. The following table describes the Teradata Dual Load connection properties: Attribute Primary TDPID Secondary TDPID Database Name Tenacity Max Sessions Min Sessions Sleep Data Encryption Block Size Name of the primary Teradata server. Default is $$PrimaryServerTDPIDWF. When you run the workflow, the workflow assigns the primary server name that you configure as the workflow variable. Note: If you edit the default value, verify that you enter the same value as the $$PrimaryServerTDPIDWF variable in the workflow. Name of the secondary Teradata server. Default is $$SecondaryServerTDPIDWF. When you run the workflow, the workflow assigns the secondary server name that you configure as the workflow variable. Note: If you edit the default value, verify that you enter the same value as the $$SecondaryServerTDPIDWF variable in the workflow. Name of the Teradata database. If you do not enter a database name, Teradata PT API uses the default login database name. Number of hours that Teradata PT API continues trying to log on when the maximum number of operations runs on the Teradata database. Must be a positive integer. Default is 4. Maximum number of sessions that Teradata PT API establishes with the Teradata database. Must be a positive integer. Default is 4. Minimum number of Teradata PT API sessions required for the Teradata PT API job to continue. Must be a positive integer between 1 and the Max Sessions value. Default is 1. Number of minutes that Teradata PT API pauses before it retries to log in when the maximum number of operations runs on the Teradata database. Must be a positive integer. Default is 6. Enables full security encryption of SQL requests, responses, and data. Default is disabled. Maximum block size, in bytes, that Teradata PT API uses when it returns data to the PowerCenter Integration Service. Minimum is 256. Maximum is 64,330. Default is 64,000. 3

4 Attribute System Operator File Location File Name Teradata PT API operator type: - Load. Bulk loads data into an empty Teradata database table. - Update. Performs update, insert, upsert, and delete operations against Teradata database tables. - Stream. Performs update, insert, upsert, and delete operations against Teradata database tables in near real-time mode. Select Stream if you want to enable recovery for sessions that load data to Teradata. Default is Stream. Note: Do not use the Export operator for dual load sessions. Dual load sessions are not designed to read data from Teradata. Location of the staging file. You must have access to create files and directories in this location. Each dual load target must have a unique file location. File location should not contain spaces. The session fails if the file location contain spaces. Default is $$FileLocationWF. When you run the workflow, the PowerCenter Integration Service assigns the the value of the $$FileLocationWF variable that you configure as the workflow variable. To configure the connection for a second target, enter the name of the workflow variable that you configured for the target file location. Note: If you edit the default value, verify that you enter the same value as the file location variable in the workflow. Name of the staging file. Default is $$FileNameWF. When you run the workflow, the PowerCenter Integration Service assigns the the value of the $$FileNameWF variable that you configure as the workflow variable. File name should not contain spaces. The session fails if the file location contain spaces. To configure the connection for a second target enter the name of the workflow variable that you configured for the target file name. Note: If you edit the default value, verify that you enter the same value as the file name variable in the workflow. Creating a Teradata Dual Load Connection 1. Click Connections > Relational in the Workflow Manager. The Relational Connection Browser dialog box appears. 2. Click New. The Select Subtype dialog box appears. 3. Select Teradata Dual Load Connection, and then click OK. The Relational Connection Editor dialog box appears. 4. Enter the following properties for the connection: Property Name User Name Connection name used by the Workflow Manager. Connection name cannot contain spaces or other special characters, except underscore (_). Database user name with permissions to access the database. To define the user name in the parameter file, enter the session parameter $ParamName as the user name, and define the value in the session or workflow parameter file. The PowerCenter Integration Service interprets user names that start with $Param as session parameters. 4

5 Property Use Parameter in Password Password Code Page Indicates the password for the database user name is a session parameter, $ParamName. If you enable this option, define the password in the workflow or session parameter file, and encrypt using the pmpasswd CRYPT_DATA option. Default is disabled. Password for the database user name. Code page associated with the database. When you run the session that extracts data from a Teradata source or loads data to a Teradata target, the code page of the Teradata PT API connection must be the same as the code page of the Teradata source and the target. 5. Enter the Teradata Dual Load connection attributes. 6. Click OK. Mapping External Loader Properties to TPT API Properties When you migrate from external loaders to dual load, you must configure the session and connection properties to match the external loader properties. Mapping TPump to Dual Load The following table describes the mapping of the TPump properties to the Dual Load session and connection properties: TPump Property TPT API Property Session/ Connection TDPID TDPID Connection Host name of the Teradata database. Database Name Database Name Connection Working database name. Error Limit Error Limit Session Maximum number of rows that TPT API rejects before it stops loading data to the database table. Checkpoint Commit Interval Session Number of rows transmitted to the Teradata database between checkpoints. Tenacity Tenacity Connection Number of hours TPT API tries to log in to the required sessions when the maximum number of load jobs are already running on the Teradata database Load Mode n/a Mode to generate SQL commands: Insert, Delete, Update, Upsert, or Data Driven. Not applicable for TPT API since TPT API does not use control file. To flag the rows for upsert, you can use the session property Update Else Insert. Drop Error Tables Drop Error Tables Session Drops the error tables before beginning the next session. The session fails if non-empty error tables exist from a prior job. External Loader Executable n/a Name and optional file path of the Teradata external loader executable. If the external loader executable 5

6 TPump Property TPT API Property Session/ Connection directory is not in the system path, you must enter the full path. Not applicable for TPT API since TPT API transfers the buffers without staging any data. Max Sessions Max Sessions Connection Maximum number of TPT API sessions in a job. Max Sessions must be between 1 and the total number of access module processes (AMPs) on the system Sleep Sleep Connection Number of minutes that TPT API pauses before retrying a login. TPump/TPT API tries until the login succeeds or the number of hours specified in the Tenacity attribute elapses Packing Factor Pack Session Number of rows that each session buffer holds. Packing improves network and channel efficiency by reducing the number of sends and receives between the target flat file and the Teradata database. Statement Rate n/a Initial maximum rate in a minute at which the TPump executable sends statements to the Teradata database. Not applicable for TPT API sessions since TPT API does not allow the user to control the statement rate. Serialize Serialize Session Determines whether operations on a given key combination of rows occur serially. Enable serialize if the job contains multiple changes to one row. Sessions that contain multiple partitions with the same key range but different filter conditions may cause multiple changes to a single row. Enable Serialize to prevent locking conflicts in the Teradata database, especially if you set the Pack attribute to a value greater than 1. If you enable Serialize, the Integration Service uses the primary key specified in the target table as the Key column. If no primary key exists in the target table, clear this option. Robust n/a If you enable Robust, TPump begins at the last checkpoint when you restart the session. TPump reloads any data that was loaded after the checkpoint. Not applicable for TPT API sessions. Robust is enabled by default for CDC sources to support recovery. No Monitor n/a Prevents TPump from checking for statement rate changes from, or update status information for, the TPump monitor application. Not applicable for TPT API sessions since user cannot control statement rate. Is Staged n/a Loads data to a flat file staging area before loading to the database. Otherwise, the data is loaded to the database using a named pipe. Not applicable for TPT API since TPT API transfers the buffers without staging any data. 6

7 TPump Property TPT API Property Session/ Connection Error Database Error Database Session Error database name. Use this attribute to override the default error database name. If you do not specify a database name, the Integration Service uses the target table database. Work Table Database Work Table Database Session Work table database name. Use this attribute to override the default work table database name. If you do not specify a database name, the Integration Service uses the target table database Log Table Database Log Database Session Log table database name. Use this attribute to override the default log table database name. If you do not specify a database name, the Integration Service uses the target table database. User Variables n/a User-defined variable used in the default control file. Not applicable for TPT API since TPT API does not use control file. Error Table Error Table Name 1 Session Table name for the first error table overrides the default error table name. If you do not specify an error table name, the Integration Service uses ET_<target_table_name>. Log Table Log Table Name 1 Session Log table name. Use this attribute to override the default log table name. If you do not specify a log table name, the Integration Service uses TL_<target_table_name><partition_number>. Control File Content Override n/a Control file text. Use this attribute to override the control file the Integration Service uses when it loads to Teradata. Not applicable for TPT API sessions. Control file parameters used by TPump are available as session properties in TPT API. Mapping Mload to Dual Load The following table describes the mapping of the Mload properties to the Dual Load session and connection properties: Mload Property TPT API Property Type TDPID TDPID Connection Host name of the Teradata database. Database Name Database Name Connection Name of the database to which you want to load data. Date Format n/a Date format in the the control file. The date format in the connection object must match the date format you define in the target definition. Not applicable for TPT API. In TPT API you cannot override the date format supported by the mapping language. 7

8 Mload Property TPT API Property Type Error Limit Error Limit Session Maximum number of rows that TPT API rejects before it stops loading data to the database table. Checkpoint Commit Interval Session Number of rows transmitted to the Teradata database between checkpoints. Tenacity Tenacity Connection Number of hours TPT API tries to log in to the required TPT API sessions when the maximum number of load jobs are already running on the Teradata database. Load Mode n/a Mode to generate SQL commands: Insert, Delete, Update, Upsert, or Data Driven. Not applicable for TPT API since TPT API does not use control file. To flag the rows for upsert, you can use the session property Update Else Insert. Drop Error Tables Drop Error Tables Session Drops the error tables before beginning the next session. The session fails if non-empty error tables exist from a prior job. External Loader Executable n/a Name and optional file path of the Teradata external loader executable. Not applicable for TPT API since TPT API transfers the buffers without staging any data. Max Sessions Max Sessions Connection Maximum number of TPT API sessions per job. Max Sessions must be between 1 and the total number of access module processes (AMPs) on the system. Sleep Sleep Connection Number of minutes TPT API pauses before retrying a login. TPT API tries until the login succeeds or the number of hours specified in the Tenacity attribute elapses. Truncate Target Table Truncate Table Session Truncates the target database table before beginning the job. TPT API cannot load data to non-empty tables. Is Staged n/a Method of loading data. Select Is Staged to load data to a flat file staging area before loading to the database. Otherwise, the data is loaded to the database using a named pipe. Not applicable for TPT API since TPT API transfers the buffers without staging any data. Error Database Error Database Session Error database name. Use this attribute to override the default error database name. If you do not specify a database name, the Integration Service uses the target table database. Work Table Database Work Table Database Session Work table database name. Use this attribute to override the default work table database name. If you do not specify a database name, the Integration Service uses the target table database. 8

9 Mload Property TPT API Property Type In TPT API, the attribute is applicable to the Update operator. Log Table Database Log Database Session Log table database name. Use this attribute to override the default log table database name. If you do not specify a database name, the Integration Service uses the target table database. User Variables n/a User-defined variable used in the default control file. Not applicable for TPT API since TPT API does not use control file. Error Table 1 Error Table Name 1 Session Table name for the first error table overrides the default error table name. If you do not specify an error table name, the Integration Service uses ET_<target_table_name>. Error Table 2 Error Table Name 2 Session Table name for the second error table overrides the default error table name. If you do not specify an error table name, the Integration Service uses UV_<target_table_name>. Control File Content Override n/a Control file text. Use this attribute to override the control file the Integration Service uses when it loads to Teradata. Not applicable for TPT API. Mapping FastLoad to Dual Load The following table describes the mapping of the FastLoad properties to the Dual Load session and connection properties: FastLoad Property TPT API Property Type TDPID TDPID Connection Host name of the Teradata database. Database Name Database Name Connection Name of the database to which you want to load data. Error Limit Error Limit Session Maximum number of rows that TPT API rejects before it stops loading data to the database table. Checkpoint Commit Interval Session Number of rows transmitted to the Teradata database between checkpoints. Tenacity Tenacity Connection Number of hours TPT API tries to log in to the required TPT API sessions when the maximum number of load jobs are already running on the Teradata database. Drop Error Tables Drop Error Tables Session Drops the error tables before beginning the next session. The session fails if non-empty error tables exist from a prior job. External Loader Executable n/a Name and optional file path of the Teradata external loader executable. Not applicable for TPT API since TPT API transfers the buffers without staging any data. 9

10 FastLoad Property TPT API Property Type Max Sessions Max Sessions Connection Maximum number of FastLoad sessions in a job. Max Sessions must be between 1 and the total number of access module processes (AMPs) on the system. Sleep Sleep Connection Number of minutes TPT API pauses before retrying a login. TPT API tries until the login succeeds or the number of hours specified in the Tenacity attribute elapses. Truncate Target Table Truncate Table Session Truncates the target database table before beginning the job. TPT API cannot load data to non-empty tables. Is Staged n/a Loads data to a flat file staging area before loading to the database. Otherwise, the data is loaded to the database using a named pipe. Not applicable for TPT API since TPT API transfers the buffers without staging any data. Error Database Error Database Session Error database name. Use this attribute to override the default error database name. If you do not specify a database name, the Integration Service uses the target table database. Error Table 1 Error Table Name 1 Session Table name for the first error table overrides the default error table name. If you do not specify an error table name, the Integration Service uses ET_<target_table_name>. Error Table 2 Error Table Name 2 Session Table name for the second error table overrides the default error table name. If you do not specify an error table name, the Integration Service uses UV_<target_table_name>. Control File Content Override n/a Control file text. Fastload uses this attribute to override the control file the Integration Service uses when it loads to Teradata. Not applicable for TPT API. Control file parameters used by Fastload are available as session properties in TPT API. Mapping FastExport to TPT API The following table describes the mapping of the FastExport properties to the TPT API session and connection properties: FastLoad Property TPT API Property Type TDPID TDPID Connection Host name of the Teradata database. Tenacity Tenacity Connection Number of hours TPT API tries to log in to the required TPT API sessions when the maximum number of load jobs are already running on the Teradata database. Max Sessions Max Sessions Connection Maximum number of TPT API sessions per job. Max Sessions must be between 1 and the total number of access module processes (AMPs) on the system. Sleep Sleep Connection Number of minutes TPT APIpauses before retrying a login. TPT API tries until the login succeeds or the number of hours specified in the Tenacity attribute elapses. 10

11 FastLoad Property TPT API Property Type Block Size Block Size Connection Maximum block size to use for the exported data. Data Encryption Data Encryption Connection Encrypts data that you want to load. You can use data encryption with the Teradata 8 client. Log table Name n/a Restart log table name. The FastExport utility uses the information in the restart log table to restart jobs that halt because of a Teradata database or client system failure. Not applicable for TPT API. You can configure Error/Log/Work databases and tables in TPT API through session properties. Executable Name n/a Teradata command used to read the source data. Not applicable to TPT API,since TPT API transfers the buffers directly without landing any data. Database name Database name Connection The name of the Teradata database you want to connect. The Integration Service generates the SQL statement using the database name as a prefix to the table name. Control File Content Override n/a Control file text. FastExport uses this attribute to override the control file the Integration Service uses when it loads to Teradata. Not applicable for TPT API. Control file parameters used by FastExport are available as session properties in TPT API. Limitations of Dual Load over External Loaders Dual Load sessions have the following limitations which are not applicable to the external loaders: You can use user defined functions (UDF) in the control file with external loaders. UDFs are not supported by Dual Load. External loaders and FastExport supports all the codepages supported by PowerCenter.Teradata PT API supports only the following codepages: - UTF-8 encoding of Unicode - MS Windows Latin 1 (ANSI) superset of Latin1 - MS Windows Japanese, superset of Shift-JIS Converting an External Loader Session to a Dual Load Session 1. In the Workflow Manager, open the external loader session that you want to convert. 11

12 2. Change the writer type from File Writer to Teradata Parallel Transporter Writer in the Writers settings on the Mapping tab. 3. From the Connections settings on the Targets node, select a Teradata Dual Load Connection. 4. From the Connections settings on the Targets node of the Mapping tab, configure the Teradata PT API target properties. When you configure the target properties, provide the same values as in the loader connection. 12

13 Teradata PT API Target Properties Configure the Teradata PT API target properties in a dual load session. The following table describes the Teradata PT API target properties: Property Work Table Database Work Table Name Macro Database Pause Acquisition Instances Query Band Expression Update Else Insert Truncate Table Mark Missing Rows Mark Duplicate Rows Name of the database that stores the work tables. Name of the work table. Name of the database that stores the macros that Teradata PT API creates when you select the Stream system operator in the connection object. The Stream system operator uses macros to modify tables. It creates macros before Teradata PT API begins loading data and removes them from the database after Teradata PT API loads all rows to the target. If you do not specify a macro database, Teradata PT API stores the macros in the log database. Pauses the load operation before the session loads data to the Teradata PT API target. Disable when you want to load the data to the target. Default is disabled. The number of parallel instances to load data into the Teradata PT API target. Default is 1. PowerCenter Dual Load Option for Teradata does not support multiple instances. The query band expression that the PowerCenter Integration Service passes to the Teradata PT API. A query band expression is a set of name-value pairs that identify the originating source of a query. In the expression, each name-value pair is separated by a semicolon, and the expression ends with a semicolon. For example, ApplicationName=Informatica;Version=9.0.1;ClientUser=A; Teradata PT API updates existing rows and inserts other rows as if marked for update. If disabled, Teradata PT API updates existing rows only. The PowerCenter Integration Service ignores this attribute when you treat source rows as inserts or deletes. Default is disabled. Teradata PT API deletes all rows in the Teradata target before it loads data. This attribute is available for the Update and Stream system operators. It is available for the Load system operator if you select a Teradata target ODBC connection. Default is disabled. Specifies how Teradata PT API handles rows that do not exist in the target table: - None. If Teradata PT API receives a row marked for update or delete that is missing in the target table, Teradata PT API does not mark the row in the error table. - For Update. If Teradata PT API receives a row marked for update that is missing in the target table, Teradata PT API marks the row as an error row. - For Delete. If Teradata PT API receives a row marked for delete that is missing in the target table, Teradata PT API marks the row as an error row. - Both. If Teradata PT API receives a row marked for update or delete that is missing in the target table, Teradata PT API marks the row as an error row. Default is None. Specifies how Teradata PT API handles duplicate rows when it attempts to insert or update rows in the target table: - None. If Teradata PT API receives a row marked for insert or update that causes a duplicate row in the target table, Teradata PT API does not mark the row in the error table. - For Insert. If Teradata PT API receives a row marked for insert but it exists in the target table, Teradata PT API marks the row as an error row. - For Update. If Teradata PT API receives a row marked for update that causes a duplicate row in the target table, Teradata PT API marks the row as an error row. - Both. If Teradata PT API receives a row marked for insert or update that causes a duplicate row in the target table, Teradata PT API marks the row as an error row. 13

14 Property Default is For Insert. Log Database Log Table Name Error Database Error Table Name1 Error TableName2 Drop Log/Error/Work Tables Serialize Pack Pack Maximum Buffers Error Limit Replication Override Driver Tracing Level Name of the database that stores the log tables. Name of the restart log table. Name of the database that stores the error tables. Name of the first error table. Name of the second error table. Drops existing log, error, and work tables for a session when the session starts. This attribute is available if you select a Teradata target ODBC connection. Default is disabled. Uses the Teradata PT API serialize mechanism to reduce locking overhead when you select the Stream system operator. Default is enabled. Number of statements to pack into a request when you select the Stream system operator. Must be a positive integer. Default is 20. Minimum is 1. Maximum is 600. Causes the Teradata PT API to determine the maximum number of statements to pack into a request when you select the Stream system operator. Default is disabled. Determines the maximum number of request buffers that may be allocated for the Teradata PT API job when you select the Stream system operator. Teradata PT API determines the maximum number of request buffers according to the following formula: Max_Request_Buffers = Buffers * Number_Connected_Sessions Must be a positive integer. Default is 3. Minimum is 2. Maximum number of records that can be stored in the error table before the Teradata PT API terminates the Stream system operator job. Must be -1 or a positive integer. Default is -1, which specifies an unlimited number of records. Specifies how Teradata PT API overrides the normal replication services controls for an active Teradata PT API session: - On. Teradata PT API overrides normal replication services controls for the active session. - Off. Teradata PT API disables override of normal replication services for the active session when change data capture is active. - None. Teradata PT API does not send an override request to the Teradata database. Default is None. Determines Teradata PT API tracing at the driver level: - TD_OFF. Teradata PT API disables tracing. - TD_OPER. Teradata PT API enables tracing for driver-specific activities for Teradata. - TD_OPER_ALL. Teradata PT API enables all driver-level tracing. - TD_OPER_CLI. Teradata PT API enables tracing for activities involving CLIv2. - TD_OPER_NOTIFY. Teradata PT API enables tracing for activities involving the Notify feature. - TD_OPER_OPCOMMON. Teradata PT API enables tracing for activities involving the operator common library. Default is TD_OFF. 14

15 Property Infrastructure Tracing Level Trace File Name Determines Teradata PT API tracing at the infrastructure level: - TD_OFF. Teradata PT API disables tracing. - TD_OPER. Teradata PT API enables tracing for driver-specific activities for Teradata. - TD_OPER_ALL. Teradata PT API enables all driver-level tracing. - TD_OPER_CLI. Teradata PT API enables tracing for activities involving CLIv2. - TD_OPER_NOTIFY. Teradata PT API enables tracing for activities involving the Notify feature. - TD_OPER_OPCOMMON. Teradata PT API enables tracing for activities involving the operator common library. Default is TD_OFF. You must enable the driver tracing level before you can enable the infrastructure tracing level. File name and path of the Teradata PT API trace file. Default path is $PM_HOME. Default file name is <Name of the TPT Operator>_timestamp. For example, LOAD_ Scenario: Migration from Single Loader Session to Dual Load Session The following scenario describes how to migrate a single loader session with FastLoad external loader to a dual load session. The hourly call data received by the technical support team is aggregated in a Teradata database for further analysis. The existing system uses FastLoad to load data in to the Teradata database. The mapping, m_cust_agg maps the source cust_acct_hrly_agg to the target cust_acct_agg. The workflow wf_hrly_fastload_workflow loads data to the Teradata system with the session s_hrly_fastload. The session uses FastLoad to load data to the Teradata target. 15

16 Perform the following steps to migrate the FastLoad session to a dual load session. 1. Right-click on s_hrly_fastload and click Duplicate to create a copy of s_hrly_fastload. 2. Rename the object if required. 3. Configure the dual load connection properties with the properties used in the FastLoad configuration. 4. In the Target section of the Mapping properties of the session, change the Writer to Teradata Parallel Transporter Writer from File Writer. 16

17 5. Select Teradata_Dual_Load_Connection as the relational connection. 6. Configure the dual load session properties with the properties used in the FastLoad configuration. 7. In the dual load workflow, replace UserSession with s_hrly_dualload. 8. Click Workflow Workflow > Edit. 17

18 . 9. On the Variables tab, enter the details of the dual load environment. Author Narayan Sivaramakrishnan Technical Writer Acknowledgements The author would like to acknowledge Rajeeva Lochan Yellanki, Anudeep Sharma, and Diby Malakar. 18