# buffer\_manager\_cached\_memory

> **⚠️ Warning**: This value cannot be modified by users.

SingleStore caches memory (allocated by the Buffer Manager) that is not in use, instead of returning it to the system. The `buffer_manager_cached_memory` variable keeps a track of this cached memory. Let’s say a query consumes XXX GBs of memory for execution. Once the query execution completes, instead of being returned to the system (Linux), this memory is stored as the Buffer Manager cached memory. Thereafter, if some other query needs memory, it will get that memory from the cache. This process avoids system call/contention over access to memory, which can be substantial. The size of memory reserved for each node in the cache can be viewed in the output of the [SHOW STATUS EXTENDED](https://docs.singlestore.com/db/v9.1/reference/sql-reference/show-commands/show-status-extended.md) command for each node. For example,

```sql
SHOW STATUS EXTENDED LIKE 'buffer_manager_cached%';

```

```output

+------------------------------+---------+
| Variable_name                |  Value  |
+------------------------------+---------+
| Buffer_manager_cached_memory | 80.0 MB |
+------------------------------+---------+

```

`buffer_manager_cached_memory` has following limitations:

* `buffer_manager_cached_memory` is capped at **25%** of the `maximum_memory`.
* Buffers will only be cached if the `total_server_memory` is less than **90%** of the `maximum_memory`

For more information on `buffer_manager_cached_memory` and `total_server_memory`, see the [Summary variables](https://docs.singlestore.com/db/v9.1/reference/troubleshooting-reference/identifying-and-reducing-memory-usage.md) topic.

***

Modified at: June 22, 2022

Source: [/db/v9.1/user-and-cluster-administration/maintain-your-cluster/managing-memory/buffer-manager-cached-memory/](https://docs.singlestore.com/db/v9.1/user-and-cluster-administration/maintain-your-cluster/managing-memory/buffer-manager-cached-memory/)

(An index of the documentation is available at /llms.txt)