Installing and Configuring SAP MaxDB

To enable HA for SAP MaxDB to make SAP MaxDB highly available, additional installation and configuration operations are required. These operations supplement the standard installation and standard configuration of SAP MaxDB.

During a standard installation, SAP MaxDB is installed with a physical host name. To enable SAP MaxDB to run in a cluster, you must modify SAP MaxDB to use a logical host name.

For information about the standard installation and standard configuration of SAP MaxDB, see the following documentation:

If you are using SAP MaxDB with SAP NetWeaver, see the SAP NetWeaver documentation for information about how to install and configure SAP NetWeaver with SAP MaxDB.
If you are using SAP MaxDB independently of SAP NetWeaver, see the SAP MaxDB documentation.

How to Install and Configure SAP MaxDB

On one node of the cluster, install the SAP MaxDB software.
Ensure that you install SAP MaxDB on its own global device group.
Perform a standard configuration of SAP MaxDB.
Create the .XUSER.62 file in the home directory of the operating system user who administers the SAP MaxDB instance.
1. Create a plain text file that contains information about the database user who administers the SAP MaxDB database instance.
  For information about the content of this file, see the SAP MaxDB documentation. For the name of the server on which the database is running, specify the logical host name for the SAP MaxDB resource that you specified in Configuration Planning Questions.
  For an example of the content of this file, see Example 1-4.
2. As SAP MaxDB admin user, generate the .XUSER.62 file from the plain text file that you created in Step a.
  Use the SAP MaxDB command xuser for this purpose.
```
# xuser -b user-info-file
```
  -b user-info-file
  
  Specifies the plain text file from which you are generating the .XUSER.62 file
Copy the /usr/spool/sql directory and its contents from the node on which you installed SAP MaxDB to all nodes where resources for SAP MaxDB and SAP xserver will run.
To ensure that the same owner owns the directory and its contents on all nodes, use the tar(1) command and the ssh(1).
```
# tar cfB - /usr/spool/sql | ssh destination "cd /;tar xfB -"
```
destination

Specifies the node to which you are copying the /usr/spool/sql directory and its contents

The following example shows a plain text file that contains information about a database user who administers an SAP MaxDB instance.
Distribute /etc/opt/sdb on all nodes to run SAP MaxDB.
Copy the /etc/opt/sdb directory and its contents from the node on which you installed SAP MaxDB to all nodes where resources for SAP MaxDB and SAP xserver will run.
To ensure that the same owner owns the directory and its contents on all nodes, use the tar(1) command and the ssh(1).
```
# tar cfB - /etc/opt/sdb | ssh destination "cd /;tar xfB -"
```
destination

Specifies the node to which you are copying the /etc/opt/sdb directory and its contents

Example 1-4 Information About a Database User Who Administers a SAP MaxDB Instance

DEFAULT
dbm
dbm
TST
srvr-1
blank line
blank line
-1
-1
blank line

This example specifies the following information about a database user who administers an SAP MaxDB instance:

The user key that is used to address this combination of XUSER data is named DEFAULT.
The user name and password of the database user are dbm.
The name of the SAP MaxDB instance is TST.
The logical host name for the SAP MaxDB resource is srvr-1.
No structured query language (SQL) mode is specified.
The default time-out value of the SAP MaxDB instance is used.
The default isolation level of the SAP MaxDB instance is used.

For more information, see the SAP MaxDB documentation.

How to Enable SAP MaxDB to Run in a Cluster

Create a failover resource group to contain the SAP MaxDB application resources and the logical host name for the SAP MaxDB resource.
Use the resource group that you identified when you answered the questions in Configuration Planning Questions.
```
# clresourcegroup create -n node-list sapdb-rg
```
sapdb-rg

Specifies that the resource group that you are creating is named sapdb-rg.
Ensure that all network resources that you intend to you use are added to your name service database.
Add a logical host name resource to the failover resource group that you created in Step 1.
```
# clreslogicalhostname create -g sapdb-rg \
-h sapdb-logical-hostname sapdb-logical-hostname
```
-g sapdb-rg

Specifies that the logical host name's database resource is to be added to the failover resource group that you created in Step 1.

-h

Specifies the host name list. You must use this option either when more than one logical host needs to be associated with the new SAP MaxDB resource or when the IP alias logical host does not have the same name as the SAP MaxDB resource itself. SAP MaxDB is the resource for the sapdb-logical-hostname that you specified in Configuration Planning Questions.

sapdb-logical-hostname

Specifies the logical host name of the server on which the database is running. This host name must be the logical host name for the SAP MaxDB resource that you specified in Configuration Planning Questions.

Note - If you require a fully qualified hostname, you must specify the fully qualified name with the -h option and you cannot use the fully qualified form in the resource name.
Enable the resource group that you created in Step 1.
```
# clresourcegroup online -emM sapdb-rg
```
-emM

Enables the resource group sapdb-rg created in Step 1 and moves it to the MANAGED state.

Example 1-5 Enabling SAP MaxDB to Run in a Cluster

This example shows the sequence of commands that are required to enable SAP MaxDB to run in a cluster. The commands are run on only one cluster node.

The following command creates a failover resource group to contain the SAP MaxDB application resources and the logical host name for the SAP MaxDB resource. The resource group is named sapdbrg. The sapdbrg resource group can be brought online on all cluster nodes or zones.
```
# clresourcegroup create sapdbrg
```
The following command adds a logical host name resource to the sapdbrg resource group. The logical host name of the server on which the database is running is srvr-1. When the sapdbrg resource group is brought online, an attempt is made for each node to discover a network interface on the subnet that the host name list identifies.
```
# clreslogicalhostname create -g sapdbrg -h sdrvr-1 -d sapdblr 
```
Note - If you require a fully qualified hostname, you must specify the fully qualified name with the -h option and you cannot use the fully qualified form in the resource name.
The following command moves the sapdbrg resource group to the MANAGED state, brings the resource group online, and monitors the resources in the resource group.
```
# clresourcegroup online -emM sapdbrg
```

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