> For the complete documentation index, see [llms.txt](https://aiii-mike.gitbook.io/redis/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://aiii-mike.gitbook.io/redis/connection/server-client/configuration.md). # Configuration ### Redis Configuration 可於[**Redis網站**](https://redis.io/topics/config)下載各版本的**redis.conf**檔案，在檔案中以記載了每個參數的基本解釋。有關 ### Maxmemory policies 有關記憶體配置政策，可以參考[**GCP網站**](https://cloud.google.com/memorystore/docs/redis/redis-configs)，包含如何分配Redis存取記憶記憶體的比例，以及超出記憶體上限限制後的刪除規則，亦整理於下方表格。 | Parameter | Description | Acceptable values | | -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **activedefrag** | **Redis version 4.0, or later.** Works to free up instance memory tied up by [standard OSS Redis memory fragmentation behavior](https://redis.io/topics/memory-optimization). |

no (default)
yes

| | **lfu-decay-time** | **Redis version 4.0, or later.** The time, in minutes, before the LFU frequency counter for a given key will be divided by two (or, if the counter is < 10, decremented by 1). See the [REDIS.CONF](https://raw.githubusercontent.com/antirez/redis/4.0/redis.conf) file for additional information. |

Positive integers of the 'long' data type
(default=1)

| | **lfu-log-factor** | **Redis version 4.0, or later.** Determines how the frequency counter represents key hits. Before you modify the default configuration, read about how the `lfu-log-factor` configuration works in the [REDIS.CONF](https://raw.githubusercontent.com/antirez/redis/4.0/redis.conf) file. |

Positive integers of the 'long' data type
(default=10)

| | **maxmemory-gb** | Designates an adjustable limit at which your eviction policy takes effect. For example, if you have a 10 GB instance and you set `maxmemory-gb` to `8`, your eviction policy takes effect when your data occupies 8 GB of your instance memory. This leaves you 2 GB of memory as overhead. By default `maxmemory-gb` is set to your instance capacity. For details on how to best use the `maxmemory-gb` configuration, see the Memorystore [memory management best practices](https://cloud.google.com/memorystore/docs/redis/memory-management-best-practices).You can only [modify](https://cloud.google.com/memorystore/docs/redis/configuring-redis#setting_and_updating_configuration_parameters_with_the) the `maxmemory-gb` configuration using the `gcloud` command-line tool. The configuration is not available in the Google Cloud Console |

Number of GB expressed as a whole number or decimal.
Examples:
10 designates a maxmemory-gb of 10 GB.
1.5 designates a maxmemory-gb of 1.5 GB.
maxmemory-gb can be reduced to a minimum of 20% of your instance capacity.

| | **maxmemory-policy** |

Specifies the behavior Redis follows when the instance data reaches the maxmemory-gb limit. Refer to Maxmemory policies for a description of the behavior of each policy.

For additional information about the open source Redis maxmemory policies, see the open source Redis LRU cache page

|

noeviction
allkeys-lru
volatile-lru (default)
allkeys-random
volatile-random
volatile-ttl
volatile-lfu (Redis version 4.0 and higher)
allkeys-lfu (Redis version 4.0 and higher)

| | **notify-keyspace-events** | Allows clients to subscribe to notifications on certain keyspace events. See the [Redis Keyspace Notifications](http://redis.io/topics/notifications) page on the Redis site for more information. |

"" (default)
K
Keyspace events, published with **keyspace@** prefix.
E
Keyevent events, published with **keyevent@** prefix.
g
Generic commands (non-type specific) like DEL, EXPIRE, or RENAME
$
String commands
l
List commands
s
Set commands
h
Hash commands
z
Sorted set commands
x
Expired events (events generated every time a key expires)
e
Evicted events (events generated when a key is evicted for maxmemory)
A
Alias for g$lshzxe, so that the "AKE" string means all the events.

| | `stream-node-max-bytes` | **Redis version 5.0, or later.** The Redis stream data structure uses a radix tree to store items. The `stream-node-max-bytes` parameter designates the maximum number of bytes available to store items in a single tree node. Once this limit is reached new items are stored in a new tree node. |

Integers 0 and higher.
(default=4096)
0 designates a tree node of unlimited size.

| | `stream-node-max-entries` | **Redis version 5.0, or later.** The Redis stream data structure uses a radix tree to store items. The `stream-node-max-entries` parameter designates the number of items that can be stored in a single node. When this limit is reached, new items are stored in a new tree node. |

Integers 0 and higher.
(default=100)
0 designates a tree node with an unlimited number of items.

| | `timeout` | The number of seconds before idle client connections are terminated. However, if `timeout` is set to `0` idle clients do not timeout and remain connected until the client issues the termination.You can only [modify](https://cloud.google.com/memorystore/docs/redis/configuring-redis#setting_and_updating_configuration_parameters_with_the) the `timeout` configuration using the `gcloud` command-line tool. The configuration is not available in the Google Cloud Console |

0 (default)
Integers >= 120
Unit = seconds

| ### 補充：GCP Redis不可修改的參數 | Parameter | Default | | -------------------------- | ------- | | `lua-time-limit` | 5000 | | `hash-max-ziplist-entries` | 2048 | | `hash-max-ziplist-value` | 1024 | | `list-max-ziplist-size` | -2 | | `list-compress-depth .` | 0 | | `set-max-intset-entries` | 512 | | `zset-max-ziplist-entries` | 1024 | | `zset-max-ziplist-value` | 1024 | | `hll-sparse-max-byte` | 3000 | | `activerehashing` | 是 | | `hz` | 10 | | `databases` | 16 | | `maxclients` | 65000 | | `slowlog-log-slower-than` | 10000 | | `slowlog-max-len` | 128 |