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| title: "Output Port Modes" |
| description: "Reference for operator output port modes" |
| weight: 12 |
| categories: [Reference] |
| tags: [reference] |
| --- |
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| [Home](../) |
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| Texera operators emit data through output ports. Each port advertises a **mode** that describes how downstream operators should interpret the stream of tuples it produces. |
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| ### Set Snapshot |
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| The port **re-emits the complete result set on each update**. Downstream operators always see the full materialized result. |
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| ### Delta Updates |
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| The port emits an **incremental delta of the result set on each update**. Downstream operators apply the delta on top of prior state instead of receiving a re-materialized snapshot. |
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| ### Single Snapshot |
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| The port emits **exactly one snapshot for the entire execution** (not per update). Used for visualization operators whose output may exceed the memory limit, making repeated full-snapshot emission impractical. |
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