Step 3: Connecting to a Cluster

Scenario

This section describes how to use a database client to connect to the database in a GaussDB(DWS) cluster. In the following example, the Data Studio client tool is used for connection through the public network address. You can also use other SQL clients to connect to the cluster. For more connection methods, see "Connecting to a Cluster" in the Data Warehouse Service (DWS) Management Guide.

1. Obtain the name, username, and password of the database to be connected.

   If you use the client to connect to the cluster for the first time, use the administrator username and password set in Step 2: Creating a Cluster to connect to the default database gaussdb.

2. Obtaining the Public Network Address of the Cluster: Connect to the cluster database using the public network address.
3. Connecting to the Cluster Database Using Data Studio: Download and configure the Data Studio client and connect to the cluster database.

Obtaining the Public Network Address of the Cluster

1. Log in to the GaussDB(DWS) management console.
2. In the navigation tree on the left, click Clusters.
3. In the cluster list, select a created cluster (for example, dws-demo) and click next to the cluster name to obtain the public network address.

   The public network address will be used in Connecting to the Cluster Database Using Data Studio.

   Figure 1 Cluster management
   

Connecting to the Cluster Database Using Data Studio

1. GaussDB(DWS) provides a Windows-based Data Studio GUI client. The tool depends on JDK, so you must install Java 1.8.0_141 or later on the client host.

   In the Windows operating system, you can download the required JDK version from the official website of JDK, and install it by following the installation guide.

2. Log in to the GaussDB(DWS) management console.
3. Click Connections.
4. On the Download Client and Driver page, download Data Studio GUI Client.
   • Select Windows x86 or Windows x64 based on the operating system type and click Download to download the Data Studio tool matching the current cluster version.

     If clusters of different versions are available, you will download the Data Studio tool matching the earliest cluster version after clicking Download. If there is no cluster, you will download the Data Studio tool of the earliest version after clicking Download. GaussDB(DWS) clusters are compatible with earlier versions of Data Studio tools.

   • Click Historical Version to download the corresponding Data Studio version. You are advised to download the Data Studio based on the cluster version.

   If you have clusters of different versions, the system displays a dialog box, prompting you to select the cluster version and download the corresponding client. In the cluster list on the Clusters page, click the name of the specified cluster to go to the Cluster Information page and view the cluster version.

5. Decompress the downloaded client software package (32-bit or 64-bit) to the installation directory.
6. Open the installation directory and double-click Data Studio.exe to start the Data Studio client. See Figure 2.
   Figure 2 Starting the client
   

7. Choose File > New Connection from the main menu. See Figure 3.
   Figure 3 Creating a connection
   

8. In the displayed New Database Connection window, enter the connection parameters.

   Table 1 Connection parameters

   Parameter	Description	Example
   Database Type	Select HUAWEI CLOUD DWS.	HUAWEI CLOUD DWS
   Connection Name	Name of a connection	dws-demo
   Host	IP address (IPv4) or domain name of the cluster to be connected	-
   Host Port	Database port	8000
   Database Name	Database name	gaussdb
   User Name	Username for connecting to the database	-
   Password	Password for logging in to the database to be connected	-
   Save Password	Select an option from the drop-down list: Current Session Only: The password is saved only in the current session. Do Not Save: The password is not saved.	-
   Enable SSL	If Enable SSL is selected, the client can use SSL to encrypt connections. The SSL mode is more secure than common modes, so you are advised to enable SSL connection.	-

   If SSL is enabled, download the SSL certificate by referring to Downloading an SSL Certificate and decompress the certificate file. Click the SSL tab and configure the following parameters:

   Table 2 Configuring SSL parameters

   Parameter	Description
   Client SSL Certificate	Select the sslcert\client.crt file in the decompressed SSL certificate directory.
   Client SSL Key	Only the PK8 format is supported. Select the sslcert\client.key.pk8 file in the directory where the SSL certificate is decompressed.
   Root Certificate	When SSL Mode is set to verify-ca, the root certificate must be configured. Select the sslcert\cacert.pem file in the decompressed SSL certificate directory.
   SSL Password	Set the password for the client SSL key in PK8 format.
   SSL Mode	Supported SSL modes include: require verify-ca GaussDB(DWS) does not support the verify-full mode.

   Figure 4 Configuring SSL parameters
   

9. Click OK to establish the database connection.

   If SSL is enabled, click Continue in the displayed Connection Security Alert dialog box.

   After the login is successful, the RECENT LOGIN ACTIVITY dialog box is displayed, indicating that Data Studio is connected to the database. You can run the SQL statement in the SQL Terminal window on the Data Studio page.

   Figure 5 Successful login
   

   For details about how to use other functions of Data Studio, press F1 to view the Data Studio user manual.