Add Database Parameters

This article explains how to add custom parameter values that override the default values in an Exasol database.

Exasol databases are configured using parameters that are written as key-value pairs in the format "-parameter":"value". Parameters that are not explicitly defined in the configuration will use default values.

Invalid parameters or invalid configuration syntax will prevent the database from starting. To avoid unnecessary downtime, contact Support before you add or change database parameters.

This procedure can be carried out using the Administration API or ConfD.

Prerequisites

The database must be stopped. For more information, see Stop a Database.

Procedure - Administration API

The following examples use curl in a Linux terminal to send REST calls to endpoints in the Administration API. You can also use other interfaces and languages to interact with the API. For more information, see Administration API.

Placeholder values are styled as Bash variables, for example: $NODE_IP. Replace the placeholders with your own values.

The option --insecure or -k tells curl to bypass the TLS certificate check. This option allows you to connect to a HTTPS server that does not have a valid certificate. Only use this option if certificate verification is not possible and you trust the server.

  1. To get information about the database, send a GET request to the /api/v1/databases endpoint.

    curl --insecure -X "GET" \
    "https://$NODE_IP:4444/api/v1/databases" \
    -H "accept: application/json" \
    -H "Authorization: Basic $AUTH_TOKEN"

    The response includes the database ID, name, and version. Additional details are included depending on the configuration and platform.

  2. To see all currently configured additional parameters, send a GET request to the /api/v1/databases/DATABASE_ID/parameters endpoint.

    curl --insecure -X "GET" \
      "https://$NODE_IP:4444/api/v1/databases/$DATABASE_ID/parameters' \
      -H "accept: application/json" \
      -H "Authorization: Basic $AUTH_TOKEN"

    The response will list all additional parameters currently defined in the configuration. If no additional parameters have been configured, the result will be empty. Default parameters are not shown. For example:

    {
      "parameters": {}
    }

  3. If the database is running, stop it now by sending a PUT request to the /api/v1/databases/$DATABASE_ID/stop endpoint:

    curl --insecure -X "PUT" \
    "https://$NODE_IP:4444/api/v1/databases/$DATABASE_ID/stop" \
    -H "accept: application/json" \
    -H "Authorization: Basic $AUTH_TOKEN"

  4. To add parameters, send a PATCH request to the /api/v1/databases/DATABASE_ID/parameters endpoint. Add the parameters you want to add in the payload as key-value pairs in the format "-parameter": "value". For example:

    curl --insecure -X "PATCH" \
    "https://$NODE_IP:4444/api/v1/databases/$DATABASE_ID/parameters" \
    -H "accept: application/json" \
    -H "Authorization: Basic $AUTH_TOKEN" \
    -H "Content-Type: application/json" \
    -d '{
      "parameters": {
        "-forceProtocolEncryption": "1",
        "-oidcProviderClientSecret": "abcd"
      }
    }'

  5. To verify that the configuration has been updated, send a GET request to the /api/v1/databases/DATABASE_ID/parameters endpoint again. The response now shows the new parameters. For example:

    {
      "parameters": {
        "-forceProtocolEncryption": "1",
        "-oidcProviderClientSecret": "abcd"
      }
    }

  6. Start the database by sending a PUT request to the /api/v1/databases/DATABASE_ID/start endpoint:

    curl --insecure -X "PUT" \
    "https://$NODE_IP:4444/api/v1/databases/$DATABASE_ID/start \
    -H "accept: application/json" \
    -H "Authorization: Basic $AUTH_TOKEN"

Procedure - ConfD

The following examples use ConfD through the command-line tool confd_client, which is available on all database nodes. You can also access ConfD through XML-RPC in your own Python programs. For more information, see ConfD.

  1. Connect to EXAClusterOS (COS) on the cluster using c4 connect -t <DEPLOYMENT>[.<NODE>]/cos. For example:

    ./c4 connect -t 1.11/cos

    If you do not specify a node, c4 will connect to the first active node in the deployment. If the cluster is configured with an access node, the first node is the access node (usually n10).

    For more information about how to use c4 connect, see How to use c4.

  2. To find the name of the database, use the ConfD job db_list. For example:

    confd_client db_list
    - MY_DATABASE

  3. If the database is running, stop it now using the ConfD job db_stop. For example:

    confd_client db_stop db_name: MY_DATABASE

  4. To add parameters, use the ConfD job db_configure and specify the parameters to add as a space-separated list. For example:

    confd_client db_configure db_name: MY_DATABASE params_add: '[-forceProtocolEncryption=1 -oidcProviderClientSecret=abcd]'

  5. To verify that the configuration has been updated, use the ConfD job db_info. Any custom parameters will be listed in the params: section. If no custom parameters are defined, this section will not be included in the response. 

    confd_client db_info db_name: MY_DATABASE | grep params
     params: -forceProtocolEncryption=1 -oidcProviderClientSecret=abcd

  6. Start the database using the ConfD job db_start. For example:

    confd_client db_start db_name: MY_DATABASE