Pipeline database configuration

These items are used to configure and pre-populate the pipeline module database. This is an in-memory database that pipelines can use to communicate with each other.

To get more detail, just click on the item you're interested in.

Contents:

database-dumpfile

database-dumpfile specifies a file and optional directory path to which the pipeline database is dumped when Transformer exits.

The file name and directory path can contain the %r%a and %h parameters. At run time:

  • %r is replaced by the root directory (application-root) under which the Transformer runs
  • %a is replaced by the Transformer's DataSource application-name.
  • %h is replaced by the host machine's hostname.

Syntax: database-dumpfile <file-path-and-name>

Type: string

Default value: (none) If you don't explicitly specify a file, the pipeline database isn't dumped when Transformer exits.

database-insert

database-insert specifies a triplet of values that are inserted into the pipeline database when Transformer starts up, but before any pipelines are loaded. Use a separate database-insert item for each triplet to be inserted in the database.

Syntax: database-insert <primary-key> <secondary-key> <value>

Type: array of strings

Default value: (none)

Example:

database-insert "/XNAS" "CloseType" "next"

This example pre-populates the database with the market close configuration for the XNAS exchange.

Tip: You can also access this database from your pipeline code; see the "Configuration database access" page in the Modules section of the Transformer Pipeline SDK (API).

database-log-options

database-log-options specifies the types of database activity to be recorded in the pipeline activity log (see logfile in Pipeline configuration). The log records of database activity are at log-level INFO.

Syntax: database-log-options <option-value>

Type: string

Default value: all (all pipeline database access is logged)

Values accepted:

Log option name Description
all Log all pipeline database access.
put Log database insertions.
get Log database retrievals.
delete Log deletions.
counter Log changes to atomic counters. (See database.increment_atomic_counter(), database.decrement_atomic_counter() and related functions on the "Configuration database access" page in the Modules section of the Transformer Pipeline SDK.)

You can specify multiple values using the | operator, as in this example:

database-log-options put|delete

which logs database insertions and deletions, but not retrievals or changes to atomic counters.


See also: