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.TH "MEMFLUSH" "1" "Feb 01, 2024" "1.1" "libmemcached-awesome"
.SH NAME
memflush \- libmemcached Documentation
.SH SYNOPSIS
.sp
memflush [options]
.sp
Reset a server or list of servers
.SH DESCRIPTION
.sp
\fBmemflush\fP  resets the contents of \fBmemcached(1)\fP servers.
.sp
\fBWARNING:\fP
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.INDENT 3.5
This means that all data in the specified servers will be deleted.
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.SH OPTIONS
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.TP
.B \-h|\-\-help
Display help.
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.TP
.B \-V|\-\-version
Display version.
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.TP
.B \-q|\-\-quiet
Operate quietly.
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.TP
.B \-v|\-\-verbose
Operate more verbosely.
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.TP
.B \-d|\-\-debug
See \fI\%\-v|\-\-verbose\fP\&.
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.TP
.B \-s|\-\-servers <list of servers>
Specify the list of servers as \fIhostname[:port][,hostname[:port]...]\fP\&.
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.TP
.B \-n|\-\-non\-blocking
Enable non\-blocking operations.
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.TP
.B \-N|\-\-tcp\-nodelay
Disable Nagle\(aqs algorithm.
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.TP
.B \-b|\-\-binary
Enable binary protocol.
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.TP
.B \-B|\-\-buffer
Buffer requests.
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.TP
.B \-u|\-\-username <username>
Use \fIusername\fP for SASL authentication.
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.TP
.B \-p|\-\-password <password>
Use \fIpassword\fP for SASL authentication.
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.TP
.B \-e|\-\-expire <expiration>
Use \fIexpiration\fP seconds (or a UNIX timestamp).
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.sp
\fBNOTE:\fP
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Using an expiration time (period), all keys, which have not bean updated until expiration will cease to exist.
.sp
Quoting the \fI\%memcached protocol documentation\fP, it states:
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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\(aqs stored again under the
same key \fIafter\fP flush_all has invalidated the items).
.sp
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.
.sp
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).
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.SH ENVIRONMENT
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.TP
.B MEMCACHED_SERVERS
Specify a list of servers.
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.SH NOTES
.SS PROGRAM PREFIX
.sp
The prefix of this program is variable, i.e. it can be configured at build time.
.sp
Usually the client programs of \fBlibmemcached\-awesome\fP are prefixed with \fBmem\fP, like \fBmemcat\fP or \fBmemcp\fP\&.
.sp
It can be configured, though, to replace the prefix with something else like \fBmc\fP, in case of that,
the client programs of \fBlibmemcached\-awesome\fP would be called \fBmccat\fP, \fBmccp\fP, etc. respectively.
.SH SEE ALSO
.sp
\fBmemcached(1)\fP
\fBlibmemcached(3)\fP
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.IP \(bu 2
\fI\%C/C++ Client Library for memcached\fP
.IP \(bu 2
\fI\%Wiping clean the contents of a server\fP
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