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docs: purge tips #8266

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docs: purge tips #8266

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4 changes: 4 additions & 0 deletions docs/doc/30-reference/30-sql/00-ddl/20-table/60-optimize-table.md
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Expand Up @@ -4,6 +4,10 @@ title: OPTIMIZE TABLE

Use this command to compact the data in a table or purge historical data from a table.

:::tip
Databend's Time Travel feature relies on historical data. If you purge historical data from a table with the command `OPTIMIZE TABLE <your_table> PURGE` or `OPTIMIZE TABLE <your_table> ALL`, the table will not be eligible for time travel. The command removes all snapshots (except the most recent one) and their associated segments and block files.
:::

## Syntax

```sql
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