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@@ -84,7 +84,7 @@ Please note that your data history will be lost if you have modified `history` p
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| setting | default | info |
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|:---------------------------------------------:|:----------:|:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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-| mode | `dbengine` | `dbengine`: The default for long-term metrics storage with efficient RAM and disk usage. Can be extended with `dbengine page cache size MB` and `dbengine disk space MB`. <br />`save`: Netdata will save its round robin database on exit and load it on startup. <br />`map`: Cache files will be updated in real-time. Not ideal for systems with high load or slow disks (check `man mmap`). <br />`ram`: The round-robin database will be temporary and it will be lost when Netdata exits. <br />`none`: Disables the database at this host, and disables health monitoring entirely, as that requires a database of metrics. |
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+| mode | `dbengine` | `dbengine`: The default for long-term metrics storage with efficient RAM and disk usage. Can be extended with `dbengine page cache size MB` and `dbengine disk space MB`. <br />`save`: Netdata will save its round robin database on exit and load it on startup. <br />`map`: Cache files will be updated in real-time. Not ideal for systems with high load or slow disks (check `man mmap`). <br />`ram`: The round-robin database will be temporary and it will be lost when Netdata exits. <br />`alloc`: Similar to `ram`, but can significantly reduce memory usage, when combined with a low retention and does not support KSM. <br />`none`: Disables the database at this host, and disables health monitoring entirely, as that requires a database of metrics. Not to be used together with streaming. |
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| retention | `3600` | Used with `mode = save/map/ram/alloc`, not the default `mode = dbengine`. This number reflects the number of entries the `netdata` daemon will by default keep in memory for each chart dimension. Check [Memory Requirements](/database/README.md) for more information. |
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| storage tiers | `1` | The number of storage tiers you want to have in your dbengine. Check the tiering mechanism in the [dbengine's reference](/database/engine/README.md#tiering). You can have up to 5 tiers of data (including the _Tier 0_). This number ranges between 1 and 5. |
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| dbengine page cache size MB | `32` | Determines the amount of RAM in MiB that is dedicated to caching for _Tier 0_ Netdata metric values. |
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Chris Akritidis