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Using DataDirect Hybrid Data Pipeline : Creating a Data Source definition : Informix parameters
  

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Informix parameters

The following tables describe parameters available on the tabs of an Informix Data Source dialog:
*General tab
*OData tab
*Advanced tab

General tab

Click the thumbnail to view the screen. Required fields are marked with an asterisk.
General tab of the Informix data source setup dialog (on-premise)General tab of the Informix data source setup dialog (on-premise)
Table 31. General tab connection parameters for Informix
Field
Description
Connector ID
The unique identifier of the DataDirect 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).
Data Source Name
A unique name for this Data Source definition.
Note: Names can contain only alphanumeric characters and underscores.
Database
The name of the database that is running on the database server.
Description
A description of this set of connection parameters.
Host 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, InformixServer or 122.23.15.12.
Valid Values: string
where:
string
is a valid IP address or server name.
The IP address can be specified in either IPv4 or IPv6 format, or a combination of the two.
Informix Server
The name of the Informix database server to which you want to connect.
Password
Specifies a case-sensitive password that is used to connect to your Informix database. A password is required if user ID/Password authentication is enabled on your database. Contact your system administrator to obtain your password.
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.
Port Number
The port number of the Informix server to which you want to connect.
User Id
The login credentials for your Informix server.
The Hybrid Data Pipeline connectivity service uses this information to connect to the data store. The administrator of the data store must grant permission to a user with these credentials to access the data store and the target data.
Note: You can save the Data Source definition without specifying the login credentials. In that case, when you test the Data Source connection, you will be prompted to specify these details. Applications using the connectivity service will have to supply the data store credentials (if they are not saved in the Data Source) in addition to the Data Source name and the credentials for the Hybrid Data Pipeline connectivity service.

OData tab

The following table describes the controls on the OData tab. For information on using the Configure Schema editor, see Enabling OData 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 tabOData tab
Table 32. OData tab connection parameters for Informix
Field
Description
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, https://hybridpipe.operations.com/api/odata/<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 to expose through OData.
See Using the Configure Schema editor for more information.
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 the OData model icon Synch completed successfully.
Valid Values:
true | false
When the check box is selected (set to true), OData access is restricted to read-only mode.
When the check box is not selected (set to false), write operations can be performed on the OData service.
Default: false

Advanced tab

Click the thumbnail to view the screen.
Advanced tab of the Informix data source setup dialogAdvanced tab of the Informix data source setup dialog
Table 33. Advanced tab connection parameters for Informix
Field
Description
Alternate Servers
Specifies one or more alternate servers for failover and is required for all failover methods. To turn off failover, do not specify a value for the Alternate Servers connection property.
Valid Values:
(servername1[:port1][,servername2[:port2]]...)
The server name (servername1, servername2, and so on) is required for each alternate server entry. Port number (port1, port2, and so on) is optional for each alternate server entry. If the port is unspecified, the port number of the primary server is used. If the port number of the primary server is unspecified, the default port number is used.
Default: None
Catalog Options
Determines which type of metadata information is included in result sets when an application calls DatabaseMetaData methods. To include multiple types of metatdata information, add the sum of the values that you want to include. In this case, specify 6 to query database catalogs for column information and to emulate getColumns() calls.
Valid Values:
2 | 4
If set to 2, the connectivity service queries database catalogs for column information.
If set to 4, a hint is provided to the Hybrid Data Pipeline connectivity service to emulate getColumns() calls using the ResultSetMetaData object instead of querying database catalogs for column information. Using emulation can improve performance because the SQL statement that is formulated by the emulation is less complex than the SQL statement that is formulated using getColumns(). The argument to getColumns() must evaluate to a single table. If it does not, because of a wildcard or null value, for example, the Hybrid Data Pipeline connectivity service reverts to the default behavior for getColumns() calls.
Default: 2
Code Page Override
The code page to be used by the Hybrid Data Pipeline connectivity service to convert Character and Clob data. The specified code page overrides the default database code page or column collation. All Character and Clob data that is returned from or written to the database is converted using the specified code page.
By default, the Hybrid Data Pipeline connectivity service automatically determines which code page to use to convert Character data. Use this parameter only if you need to change the connectivity service’s default behavior.
Valid Values:
string
where string is the name of a valid code page that is supported by your JVM.CP950.
Default: empty string
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:
Database=Server1;UndocumentedOption1=value[;UndocumentedOption2=value;]
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
Initialization String
A semicolon delimited set of commands to be executed on the data store after Hybrid Data Pipeline has established and performed all initialization for the connection. If the execution of a SQL command fails, the connection attempt also fails and Hybrid Data Pipeline returns an error indicating which SQL commands failed.
Syntax:
command[[; command]...]
Where:
command
is a SQL command. Multiple commands must be separated by semicolons. In addition, if this property is specified in a connection URL, the entire value must be enclosed in parentheses when multiple commands are specified. For example, assuming a schema name of SFORCE:
InitializationString=(REFRESH SCHEMA SFORCE)
The default is an empty string.
Load Balancing
Determines whether the connectivity service uses client load balancing in its attempts to connect to the servers (primary and alternate) defined in a Connector group. You can specify one or multiple alternate servers by setting the AlternateServers property.
Valid Values: true | false
If set to true, the connectivity service uses client load balancing and attempts to connect to the servers (primary and alternate) in random order. The connectivity service randomly selects from the list of primary and alternate On Premise Connectors which server to connect to first. If that connection fails, the connectivity service again randomly selects from this list of servers until all servers in the list have been tried or a connection is successfully established.
If set to false, the connectivity service does not use client load balancing and connects to each servers based on their sequential order (primary server first, then, alternate servers in the order they are specified).
Default: false
Notes
*The Alternate Servers connection parameter specifies one or multiple alternate servers for failover and is required for all failover methods. To turn off failover, do not specify a value for the Alternate Servers parameter.
Login Timeout
The amount of time, in seconds, that the Hybrid Data Pipeline connectivity service waits for a connection to be established before timing out the connection request.
Valid Values:
0 | x
where x is a positive integer that represents a number of seconds.
If set to 0, the Hybrid Data Pipeline connectivity service does not time out a connection request.
If set to x, the connectivity service waits for the specified number of seconds before returning control to the application and returning a timeout error.
Default: 30
Max Pooled Statements
The maximum number of prepared statements to cache for this connection. If the value of this property is set to 20, the connectivity service caches the last 20 prepared statements that are created by the application.
The default value is 0.
Query Timeout
Sets the default query timeout (in seconds) for all statements created by a connection.
Valid Values:
-1 | 0 | x
If set to -1, the query timeout functionality is disabled. The Hybrid Data Pipeline connectivity service silently ignores calls to the connectivity service silently ignores calls to the:: Statement.setQueryTimeout() method.
If set to 0 Statement.setQueryTimeout() method., the default query timeout is infinite (the query does not time out).
If set to x, the Hybrid Data Pipeline connectivity service uses the value asHybrid Data Pipeline the default timeout for any statement that is created by the connection. To override the default timeout value set by this connection option, call the Statement.setQueryTimeout() method to set a timeout value for a particular statement.
Default: 0
Resultset Meta Data Options
Determines whether the Hybrid Data Pipeline connectivity service returns table name information in the ResultSet metadata for Select statements.
Valid Values
0 | 1
If set to 0 and the ResultSetMetaData.getTableName() method is called, the Hybrid Data Pipeline connectivity service does not perform additional processing to determine the correct table name for each column in the result set. The getTableName() method may return an empty string for each column in the result set.
If set to 1 and the ResultSetMetaData.getTableName() method is called, the connectivity service performs additional processing to determine the correct table name for each column in the result set. The connectivity service returns schema name and catalog name information when the ResultSetMetaData.getSchemaName() and ResultSetMetaData.getCatalogName() methods are called if the Hybrid Data Pipeline connectivity service can determine that information.
Default: 0
See the steps for:
Creating a Data Source definition