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Using Hybrid Data Pipeline : Creating data sources with the Web UI : MySQL Community Edition parameters

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MySQL Community Edition parameters

The following tables describe parameters available on the General tab of a MySQL Community Edition Data Source dialog.
Note: Hybrid Data Pipeline uses MySQL Connector/J when connecting to MySQL Community Edition. During installation of the Hybrid Data Pipeline server, you are prompted to specify the location of the MySQL Connector/J driver. Since MySQL Connector/J is a separate component, it may require configuration and maintenance apart from Hybrid Data Pipeline. Therefore, you should refer to MySQL Connector/J documentation for information on support, functionality, and maintenance. In addition, the Progress DataDirect Hybrid Data Pipeline Installation Guide provides a procedure for upgrading the MySQL Connector/J driver without reinstalling the Hybrid Data Pipeline server.
*General tab
*OData tab

General tab

To see a larger view of the screenshot of the General tab, click the thumbnail; or, double-click the thumbnail and select an option to open the thumbnail in a different window or tab. The screenshot shows the tab with the Set Custom Properties options displayed.
General tab of the MySQL Community Edition data source setup dialogGeneral tab of the MySQL Community Edition data source setup dialog
Table 49. General tab connection parameters for MySQL Community Edition
Data Source Name
A unique name for the data source. Data source names can contain only alphanumeric characters, underscores, and dashes.
A description of this set of connection parameters.
User Id, Password
The login credentials used to connect to the MySQL Community Edition database. A user name and password is required if user ID/password authentication is enabled on your database. Contact your system administrator to obtain your user name.
Note: By default, the password is encrypted.
By default, the characters in the Password field you type are not shown. If you want the password to be displayed in clear text, click the eye Watchful eye password button button. Click the button again to conceal the password.
Server Name
Specifies either the IP address in IPv4 or IPv6 format, or the server name (if your network supports named servers) of the primary database server, for example, or mysqlcommunityserver.
Port Number
The TCP port of the primary database server listening for connections to the database.
The name of the database that is running on the database server.
Extended Options
Specifies a semi-colon delimited list of connection options and their values. Use this configuration option to set the value of undocumented connection options that are provided by Progress DataDirect technical support. You can include any valid connection option in the Extended Options string, for example:
If the Extended Options string contains option values that are also set in the setup dialog, the values of the options specified in the Extended Options string take precedence.
Valid Values: string
Default: empty string
Connector ID
The unique identifier of the Hybrid Data Pipeline On-Premise Connector that is to be used to access the on-premise data source. Click the arrow Down arrow for a field) and select the Connector that you want to use. The identifier can be a descriptive name, the name of the machine where the Connector is installed, or the Connector ID for the Connector.
If you have not installed an On-Premise Connector, and no Connectors have been shared with you, this field and drop-down list are empty.
If you own multiple Connectors that have the same name, for example, Production, an identifier is appended to each Connector, for example, Production_dup0 and Production_dup1. If the Connectors in the drop-down list were shared with you, the owner's name is appended, for example, Production(owner1) and Production(owner2).

OData tab

The following table describes the controls on the OData tab. For information on using the Configure Schema editor, see Configuring data sources for OData connectivity and working with data source groups. For information on formulating OData requests, see Formulating queries with OData Version 2.
Click the thumbnail to view the screen. Required fields are marked with an asterisk.
OData tab of the MySQL Community Edition setup dialogOData tab of the MySQL Community Edition setup dialog
Table 50. OData tab connection parameters for MySQL Community Edition
OData Version
Enables you to choose from the supported OData versions. OData configuration made with one OData version will not work if you switch to a different OData version. If you want to maintain the data source with different OData versions, you must create different data sources for each of them.
OData Access URI
Specifies the base URI for the OData feed to access your data source, for example,<DataSourceName>. You can copy the URI and paste it into your application's OData configuration.
The URI contains the case-insensitive name of the data source to connect to, and the query that you want to execute. This URI is the OData Service Root URI for the OData feed. The Service Document for the data source is returned by issuing a GET request to the data source's service root.
The OData Service Document returns the names of the entities exposed by the Data Source OData service. To get details such as the properties of the entities exposed, the data types for those properties and the relationships between entities, the Service Metadata Document can be fetched by adding /$metadata to the service root URI.
Schema Map
Enables OData support. If a schema map is not defined, the OData API cannot be used to access the data store using this data source definition. Use the Configure Schema editor to select the tables/columns to expose through OData.
Data Source Caching
Specifies whether the connection to the backend data source is cached in a session associated with the data source. Caching the back end connection improves performance when multiple OData queries are submitted to the same data source because the connection does not need to be created on every query.
Caching of the back end connection can get in the way when trying to configure a data source for OData. If a change is made to any of the Hybrid Data Pipeline data source connection parameters, those changes will not be seen because the connection was established using the old data source definition, and was cached. The session that caches the backend connection is discarded if there is no activity to the data source for approximately 5 minutes.
When you configure a data source for OData, it is recommended that the OData session caching be disabled. Once you are satisfied with the OData configuration for the data source, enable the parameter to get the performance improvement provided by caching the connection to the backend data source.
Valid Values:
When set to 1, session caching is enabled. This provides better performance for production.
When set to 0, session caching is disabled. Use this value when you are configuring the data source.
Default: 1
Page Size
Determines the number of entities returned on each page for paging controlled on the server side. On the client side, requests can use the $top and $skip parameters to control paging. In most cases, server side paging works well for large data sets. Client side pagination works best with a smaller data sets where it is not as expensive to fetch subsequent pages.
Valid Values: 0 | n
where n is an integer from 1 to 10000.
When set to 0, the server default of 2000 is used.
Default: 0
Refresh Result
Controls what happens when you fetch the first page of a cached result when using Client Side Paging. Skip must be omitted or set to 0. You can use the cached copy of that first page, or you can re-execute the query to get a new result, discarding the previously cached result. Re-executing the query is useful when the data being fetched may change between two requests for the first page. Using the cached result is useful if you are paging back and forth through results that are not expected to change.
Valid Values:
When set to 0, the OData service caches the first page of results.
When set to 1, the OData service re-executes the query.
Default: 1
Inline Count Mode
Specifies how the connectivity service satisfies requests that include the $count parameter when it is set to true (for OData version 4) or the $inlinecount parameter when it is set to allpages (for OData version 2). These requests require the connectivity service to include the total number of entities that are defined by the OData query request. The count must be included in the first page in server-driven paging and must be included in every page when using client-driven paging.
The optimal setting depends on the data store and the size of results. The OData service can run a separate query using the count(*) aggregate to get the count, before running the query used to generate the entities. In very large results, this approach can often lead to the first page being returned faster. Alternatively, the OData service can fetch the entire result before returning the first page. This approach works well for small results and for data stores that cannot optimize the count(*) aggregate; however, it may have a longer initial response time for the first page if the result is large.
Valid Values:
When set to 1, the connectivity service runs a separate count(*) aggregate query to get the count of entities before executing the query to return results. In very large results, this approach can often lead to the first page being returned faster.
When set to 2, the connectivity service fetches all entities before returning the first page. For small results, this approach is always faster. However, the initial response time for the first page may be longer if the result is large.
Default: 1
Top Mode
Indicates how requests typically use $top and $skip for client side pagination, allowing the service to better anticipate how to process queries.
Valid Values:
Set to 0 when the application generally uses $top to limit the size of the result and rarely attempts to get additional entities by combining $top and $skip.
Set to 1 when the application uses $top as part of client-driven paging and generally combines $top and $skip to page through the result.
Default: 0
OData Read Only
Controls whether write operations can be performed on the OData service. Write operations generate a 405 Method Not Allowed response if this option is enabled.
Existing OData-enabled data sources are read only (write operations are disabled). To enable write operations for an existing OData enabled data source, clear the OData Read Only option on the OData tab. Then, on the Data Sources tab, regenerate the OData model for the data source by clicking on an OData refresh icon.
Valid Values:
When ON is selected, OData access is restricted to read-only mode.
When OFF is selected, write operations can be performed on the OData service.
Default: OFF