# Latency chains configuration

These DataSource configuration items allow the latency of data updates through the system to be monitored.

For more about how to use the configuration items on this page, see How can I ... [Record latency in record updates](datasource-record-latency-in-record-updates.md).

## latency-chain-enable

`latency-chain-enable` turns on latency chaining when set to `TRUE`.

**Use in:** C, Java

**Syntax:** `latency-chain-enable <boolean>`

**Type:** boolean

**Default value:** `FALSE` (Latency chaining is not turned on)

## latency-chain-init-ts-field

`latency-chain-init-ts-field` specifies the name of the latency chain’s initial timestamp field.

**Use in:** C, Java

**Syntax:** `latency-chain-init-ts-field <name-of-initial-timestamp-field>`

**Type:** string

**Default value:** `LTY_INIT_TS`

## latency-chain-list-event-field

`latency-chain-list-event-field` specifies the name of the latency chain’s event list field.

**Use in:** C, Java

**Syntax:** `latency-chain-list-event-field <name-of-event-list-field>`

**Type:** string

**Default value:** `LTY_LIST_EVENT`

## latency-chain-list-ts-field

`latency-chain-list-ts-field` specifies the name of the latency chain’s delta timestamp list field.

**Use in:** C, Java

**Syntax:** `latency-chain-list-ts-field <name-of-delta-timestamp-list-field>`

**Type:** string

**Default value:** `LTY_LIST_TS`

## latency-chain-name

`latency-chain-name` specifies this DataSource application’s name for the latency chain. The name can contain the parameter `%a`, which is replaced at run time by the DataSource [application-name](datasource-run-time-environment-configuration.md#application-name).

**Use in:** C, Java

**Syntax:** `latency-chain-name <name>`

**Type:** string

**Default value:** `%a`

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**See also:**

* How can I... [Record latency in record updates](datasource-record-latency-in-record-updates.md)
* Reference: Liberator [Latency configuration](../liberator/liberator-latency-configuration.md)