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MuleESB / IBM Integration Bus (IIB) Interview questions

Types of Variables in ESQL.

  • Module Variable (Normal variable), have a lifetime of just one message passing through a node. They are visible to that message only. To define normal variables, omit both the EXTERNAL and SHARED keywords.
  • External Variable (user-defined properties), exist for the entire lifetime of a message flow and are visible to all messages passing through the flow. You can define external variables only at the module and schema level.
  • Shared Variable (long Lived variable), can be used to implement an in-memory cache in the message flow. Shared variables have a long lifetime and are visible to multiple messages passing through a flow.

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