31 lines
1.3 KiB
Plaintext
31 lines
1.3 KiB
Plaintext
---
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sidebar_position: 30
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title: History
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---
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import MarkdownImage from "/src/components/MarkdownImage";
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import Link from "@docusaurus/Link";
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import { Typography, Box, Grid } from "@mui/material";
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import AggregatorHistoryBuffer from "/idl/accounts/AggregatorHistoryBuffer.md";
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import AggregatorSetHistoryBuffer from "/idl/instructions/aggregatorSetHistoryBuffer.md";
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A history buffer account stores a set number of accepted results for an aggregator, and given Solana’s maximum account size of 10MB, the maximum number of samples a single history buffer can support is 350,000 samples. An aggregator can only have a single history buffer associated with it. This feature allows Switchboard task to parse a history buffer for its calculations, such as the TwapTask.
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## Functions
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A history buffer account is responsible for the following functions:
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- [Historical Data](#historical-data): Define the number of historical samples to store.
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### 🚀Historical Data
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A history buffer has a static account size when it is initialized, equal to: `12 Bytes + (28 Bytes × Num Samples)`. Each time an aggregator value is updated on-chain, the associated history buffer is shifted to the right, and the last value is dropped.
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## Account Schema
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### 📦AggregatorHistoryBuffer
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<AggregatorHistoryBuffer />
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