---
name: "memcflush"
section: "1"
platform: "linux"
package: "libmemcached-tools"
version: "1.1.4-1.1+b2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/memcflush"
---

# memcflush(1)

libmemcached Documentation

## NAME

memflush - libmemcached Documentation

## SYNOPSIS

memflush \[options\]

Reset a server or list of servers

## DESCRIPTION

**memflush**  resets the contents of *[memcached(1)](/memcached/1.md) servers.*

**WARNING:**

*This means that all data in the specified servers will be deleted.*

## OPTIONS

- **-h\|--help**

  *Display help.*

- **-V\|--version**

  *Display version.*

- **-q\|--quiet**

  *Operate quietly.*

- **-v\|--verbose**

  *Operate more verbosely.*

- **-d\|--debug**

  *See -v\|--verbose.*

- **-s\|--servers \<list of servers\>**

  *Specify the list of servers as hostname\[:port\]\[,hostname\[:port\]...\].*

- **-n\|--non-blocking**

  *Enable non-blocking operations.*

- **-N\|--tcp-nodelay**

  *Disable Nagle's algorithm.*

- **-b\|--binary**

  *Enable binary protocol.*

- **-B\|--buffer**

  *Buffer requests.*

- **-u\|--username \<username\>**

  *Use username for SASL authentication.*

- **-p\|--password \<password\>**

  *Use password for SASL authentication.*

- **-e\|--expire \<expiration\>**

  *Use expiration seconds (or a UNIX timestamp).*

**NOTE:**

*Using an expiration time (period), all keys, which have not bean updated until expiration will cease to exist.*

*Quoting the memcached protocol documentation, it states:*

*Its effect is to invalidate all* *existing items immediately (by default) or after the expiration* *specified.  After invalidation none of the items will be returned in* *response to a retrieval command (unless it's stored again under the* *same key after flush\_all has invalidated the items).*

*The most precise* *definition of what flush\_all does is the following: it causes all* *items whose update time is earlier than the time at which flush\_all* *was set to be executed to be ignored for retrieval purposes.*

*The intent of flush\_all with a delay, was that in a setting where you* *have a pool of memcached servers, and you need to flush all content,* *you have the option of not resetting all memcached servers at the* *same time (which could e.g. cause a spike in database load with all* *clients suddenly needing to recreate content that would otherwise* *have been found in the memcached daemon).*

## ENVIRONMENT

- **MEMCACHED\_SERVERS**

  *Specify a list of servers.*

## NOTES

### PROGRAM PREFIX

*The prefix of this program is variable, i.e. it can be configured at build time.*

*Usually the client programs of* **libmemcached-awesome** *are prefixed with* **mem***, like* **memcat** *or* **memcp***.*

*It can be configured, though, to replace the prefix with something else like* **mc***, in case of that,* *the client programs of* **libmemcached-awesome** *would be called* **mccat***,* **mccp***, etc. respectively.*

## SEE ALSO

*[memcached(1)](/memcached/1.md)* *[libmemcached(3)](/libmemcached/3.md)*

- •

  *C/C++ Client Library for memcached*

- •

  *Wiping clean the contents of a server*