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  89 <li class="toctree-l1"><a class="reference internal" href="../libmemcached.html">Introduction</a></li>
  90 <li class="toctree-l1"><a class="reference internal" href="../libmemcached/index.html">libmemcached API</a></li>
  91 <li class="toctree-l1"><a class="reference internal" href="../libmemcachedutil/index.html">libmemcachedutil API</a></li>
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  94 <li class="toctree-l2"><a class="reference internal" href="memexist.html">memexist — Check for the existence of a key</a></li>
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  99 <li class="toctree-l2"><a class="reference internal" href="memaslap.html">memaslap - Load testing and benchmarking a server</a></li>
 100 <li class="toctree-l2"><a class="reference internal" href="memslap.html">memslap - Load testing and benchmarking a server</a></li>
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 102 <li class="toctree-l2"><a class="reference internal" href="memstat.html">memstat – Gather statistics from a server</a></li>
 103 <li class="toctree-l2"><a class="reference internal" href="memerror.html">memerror — Translate libmemcached error codes</a></li>
 104 <li class="toctree-l2"><a class="reference internal" href="memparse.html">memparse — Parse and validate an option string</a></li>
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 107 <li class="toctree-l2 current"><a class="current reference internal" href="#">memflush — Flush a server (erase all cached data)</a></li>
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 182
 183   <div class="section" id="memflush">
 184 <h1>memflush<a class="headerlink" href="#memflush" title="Permalink to this headline">¶</a></h1>
 185 <div class="section" id="synopsis">
 186 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 187 <p>memflush [options]</p>
 188 <p>Reset a server or list of servers</p>
 189 </div>
 190 <div class="section" id="description">
 191 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 192 <p><strong class="program">memflush</strong>  resets the contents of <em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em> servers.</p>
 193 <div class="admonition warning">
 194 <p class="first admonition-title">Warning</p>
 195 <p class="last">This means that all data in the specified servers will be deleted.</p>
 196 </div>
 197 </div>
 198 <div class="section" id="options">
 199 <h2>OPTIONS<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h2>
 200 <dl class="option">
 201 <dt id="cmdoption-memflush-help">
 202 <code class="descname">--help</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-memflush-help" title="Permalink to this definition">¶</a></dt>
 203 <dd><p>Display help.</p>
 204 </dd></dl>
 205
 206 <dl class="option">
 207 <dt id="cmdoption-memflush-version">
 208 <code class="descname">--version</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-memflush-version" title="Permalink to this definition">¶</a></dt>
 209 <dd><p>Display version.</p>
 210 </dd></dl>
 211
 212 <dl class="option">
 213 <dt id="cmdoption-memflush-quiet">
 214 <code class="descname">--quiet</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-memflush-quiet" title="Permalink to this definition">¶</a></dt>
 215 <dd><p>Operate quietly.</p>
 216 </dd></dl>
 217
 218 <dl class="option">
 219 <dt id="cmdoption-memflush-verbose">
 220 <code class="descname">--verbose</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-memflush-verbose" title="Permalink to this definition">¶</a></dt>
 221 <dd><p>Operate more verbosely.</p>
 222 </dd></dl>
 223
 224 <dl class="option">
 225 <dt id="cmdoption-memflush-debug">
 226 <code class="descname">--debug</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-memflush-debug" title="Permalink to this definition">¶</a></dt>
 227 <dd><p>See <a class="reference internal" href="#cmdoption-memflush-verbose"><code class="xref std std-option docutils literal notranslate"><span class="pre">--verbose</span></code></a>.</p>
 228 </dd></dl>
 229
 230 <dl class="option">
 231 <dt id="cmdoption-memflush-servers">
 232 <code class="descname">--servers</code><code class="descclassname"> &lt;list of servers&gt;</code><a class="headerlink" href="#cmdoption-memflush-servers" title="Permalink to this definition">¶</a></dt>
 233 <dd><p>Specify the list of servers as <em>hostname[:port][,hostname[:port]...]</em>.</p>
 234 </dd></dl>
 235
 236 <dl class="option">
 237 <dt id="cmdoption-memflush-binary">
 238 <code class="descname">--binary</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-memflush-binary" title="Permalink to this definition">¶</a></dt>
 239 <dd><p>Enable binary protocol.</p>
 240 </dd></dl>
 241
 242 <dl class="option">
 243 <dt id="cmdoption-memflush-username">
 244 <code class="descname">--username</code><code class="descclassname"> &lt;username&gt;</code><a class="headerlink" href="#cmdoption-memflush-username" title="Permalink to this definition">¶</a></dt>
 245 <dd><p>Use <em>username</em> for SASL authentication.</p>
 246 </dd></dl>
 247
 248 <dl class="option">
 249 <dt id="cmdoption-memflush-password">
 250 <code class="descname">--password</code><code class="descclassname"> &lt;password&gt;</code><a class="headerlink" href="#cmdoption-memflush-password" title="Permalink to this definition">¶</a></dt>
 251 <dd><p>Use <em>password</em> for SASL authentication.</p>
 252 </dd></dl>
 253
 254 <dl class="option">
 255 <dt id="cmdoption-memflush-expire">
 256 <code class="descname">--expire</code><code class="descclassname"> &lt;expiration&gt;</code><a class="headerlink" href="#cmdoption-memflush-expire" title="Permalink to this definition">¶</a></dt>
 257 <dd><p>Use <em>expiration</em> seconds (or a UNIX timestamp).</p>
 258 </dd></dl>
 259
 260 <div class="admonition note">
 261 <p class="first admonition-title">Note</p>
 262 <p>Using an expiration time (period), all keys, which have not bean updated until expiration will cease to exist.</p>
 263 <p>Quoting the <a class="reference external" href="https://github.com/memcached/memcached/blob/master/doc/protocol.txt">memcached protocol documentation</a>, it states:</p>
 264 <blockquote class="last">
 265 <div><p>Its effect is to invalidate all
 266 existing items immediately (by default) or after the expiration
 267 specified.  After invalidation none of the items will be returned in
 268 response to a retrieval command (unless it's stored again under the
 269 same key <em>after</em> flush_all has invalidated the items).</p>
 270 <p>The most precise
 271 definition of what flush_all does is the following: it causes all
 272 items whose update time is earlier than the time at which flush_all
 273 was set to be executed to be ignored for retrieval purposes.</p>
 274 <p>The intent of flush_all with a delay, was that in a setting where you
 275 have a pool of memcached servers, and you need to flush all content,
 276 you have the option of not resetting all memcached servers at the
 277 same time (which could e.g. cause a spike in database load with all
 278 clients suddenly needing to recreate content that would otherwise
 279 have been found in the memcached daemon).</p>
 280 </div></blockquote>
 281 </div>
 282 </div>
 283 <div class="section" id="environment">
 284 <h2>ENVIRONMENT<a class="headerlink" href="#environment" title="Permalink to this headline">¶</a></h2>
 285 <dl class="envvar">
 286 <dt id="envvar-MEMCACHED_SERVERS">
 287 <code class="descname">MEMCACHED_SERVERS</code><a class="headerlink" href="#envvar-MEMCACHED_SERVERS" title="Permalink to this definition">¶</a></dt>
 288 <dd><p>Specify the list of servers.</p>
 289 </dd></dl>
 290
 291 </div>
 292 <div class="section" id="see-also">
 293 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 294 <ul class="simple">
 295 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 296 <li><a class="reference internal" href="../libmemcached/memcached_flush.html"><span class="doc">Wiping clean the contents of a server</span></a></li>
 297 </ul>
 298 </div>
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