| --- |
| title: General Region Data Management |
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| |
| For all regions, you have options to control memory use, back up your data to disk, and discard stale data from your cache. |
| |
| - **[Persistence and Overflow](../developing/storing_data_on_disk/chapter_overview.html)** |
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| You can persist data on disk for backup purposes and overflow it to disk to free up memory without completely removing the data from your cache. |
| |
| - **[Eviction](../developing/eviction/chapter_overview.html)** |
| |
| Use eviction to control data region size. Eviction actions are triggered by space-based thresholds. |
| |
| - **[Expiration](../developing/expiration/chapter_overview.html)** |
| |
| Use expiration to keep data current and to reduce region size by removing stale entries. Expiration actions are triggered by time-based thresholds. |
| |
| - **[Keeping the Cache in Sync with Outside Data Sources](../developing/outside_data_sources/sync_outside_data.html)** |
| |
| Keep your distributed cache in sync with an outside data source by programming and installing application plug-ins for your region. |
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