https://redis.io/docs/latest/develop/data-types/strings/ Recent content in Redis Strings on Docs Hugo en https://redis.io/docs/latest/develop/data-types/strings/bitfields/ Mon, 01 Jan 0001 00:00:00 +0000 https://redis.io/docs/latest/develop/data-types/strings/bitfields/ <div class="command-group-foldout my-4 border border-slate-200 dark:border-slate-700 rounded-lg"> <div class="command-group-header flex items-center justify-between px-4 py-2 bg-slate-50 dark:bg-slate-800 rounded-t-lg"> <span class="flex items-center gap-2 flex-wrap"> <span class="text-sm font-semibold text-slate-900 dark:text-slate-100">Bitmap/bitfield command summary</span> <a href="https://redis.io/docs/latest/commands/?group=bitmap" class="text-xs text-redis-red-600 dark:text-redis-red-400 hover:underline" onclick="event.stopPropagation()"> (view reference, 7 commands) </a> </span> <button class="command-group-toggle flex items-center gap-2 hover:text-redis-red-500 transition-colors cursor-pointer" aria-expanded="false" aria-controls="cmd-group-bitmap-1779806544989638426" onclick="toggleCommandGroup(this)"> <span class="command-group-chevron transition-transform duration-200"> <svg class="w-4 h-4 text-slate-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"> <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7"></path> </svg> </span> </button> </div> <div id="cmd-group-bitmap-1779806544989638426" class="command-group-content hidden px-4 py-2 max-h-96 overflow-y-auto"> <ul class="space-y-1 list-none"> <li> <a href="https://redis.io/docs/latest/commands/bitcount/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITCOUNT </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.6.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Counts the number of set bits (population counting) in a string.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(N)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitfield/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITFIELD </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v3.2.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @write </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Performs arbitrary bitfield integer operations on strings.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1) for each subcommand specified</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitfield_ro/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITFIELD_RO </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v6.0.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @fast </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Performs arbitrary read-only bitfield integer operations on strings.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1) for each subcommand specified</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitop/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITOP </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.6.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @write </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Performs bitwise operations on multiple strings, and stores the result.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(N)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitpos/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITPOS </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.8.7 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Finds the first set (1) or clear (0) bit in a string.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(N)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/getbit/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> GETBIT </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.2.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @fast </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Returns a bit value by offset.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/setbit/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> SETBIT </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.2.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @write </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Sets or clears the bit at offset of the string value. Creates the key if it doesn&#39;t exist.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1)</span> </div> </a> </li> </ul> </div> </div> <script> function toggleCommandGroup(button) { const content = document.getElementById(button.getAttribute('aria-controls')); const isExpanded = button.getAttribute('aria-expanded') === 'true'; const chevron = button.querySelector('.command-group-chevron'); button.setAttribute('aria-expanded', !isExpanded); content.classList.toggle('hidden'); chevron.classList.toggle('rotate-180'); } </script> <p>Redis bitfields let you set, increment, and get integer values of arbitrary bit length. For example, you can operate on anything from unsigned 1-bit integers to signed 63-bit integers.</p> https://redis.io/docs/latest/develop/data-types/strings/bitmaps/ Mon, 01 Jan 0001 00:00:00 +0000 https://redis.io/docs/latest/develop/data-types/strings/bitmaps/ <div class="command-group-foldout my-4 border border-slate-200 dark:border-slate-700 rounded-lg"> <div class="command-group-header flex items-center justify-between px-4 py-2 bg-slate-50 dark:bg-slate-800 rounded-t-lg"> <span class="flex items-center gap-2 flex-wrap"> <span class="text-sm font-semibold text-slate-900 dark:text-slate-100">Bitmap/bitfield command summary</span> <a href="https://redis.io/docs/latest/commands/?group=bitmap" class="text-xs text-redis-red-600 dark:text-redis-red-400 hover:underline" onclick="event.stopPropagation()"> (view reference, 7 commands) </a> </span> <button class="command-group-toggle flex items-center gap-2 hover:text-redis-red-500 transition-colors cursor-pointer" aria-expanded="false" aria-controls="cmd-group-bitmap-1779806545108723106" onclick="toggleCommandGroup(this)"> <span class="command-group-chevron transition-transform duration-200"> <svg class="w-4 h-4 text-slate-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"> <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7"></path> </svg> </span> </button> </div> <div id="cmd-group-bitmap-1779806545108723106" class="command-group-content hidden px-4 py-2 max-h-96 overflow-y-auto"> <ul class="space-y-1 list-none"> <li> <a href="https://redis.io/docs/latest/commands/bitcount/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITCOUNT </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.6.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Counts the number of set bits (population counting) in a string.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(N)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitfield/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITFIELD </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v3.2.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @write </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Performs arbitrary bitfield integer operations on strings.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1) for each subcommand specified</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitfield_ro/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITFIELD_RO </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v6.0.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @fast </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Performs arbitrary read-only bitfield integer operations on strings.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1) for each subcommand specified</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitop/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITOP </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.6.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @write </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Performs bitwise operations on multiple strings, and stores the result.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(N)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/bitpos/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> BITPOS </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.8.7 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Finds the first set (1) or clear (0) bit in a string.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(N)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/getbit/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> GETBIT </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.2.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @read </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @fast </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Returns a bit value by offset.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1)</span> </div> </a> </li> <li> <a href="https://redis.io/docs/latest/commands/setbit/" class="block px-3 py-1.5 rounded hover:bg-slate-100 dark:hover:bg-slate-800 transition-colors no-underline hover:no-underline"> <div class="flex flex-col"> <div class="flex items-center gap-1.5 flex-wrap"> <span class="text-sm font-mono text-redis-ink-900 dark:text-redis-pen-200 font-medium"> SETBIT </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> v2.2.0 </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @write </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @bitmap </span> <span class="text-xs text-slate-500 dark:text-slate-400 bg-slate-100 dark:bg-slate-700 px-1 py-0 rounded"> @slow </span> </div> <span class="block text-xs !text-xs text-slate-600 dark:text-slate-400 leading-tight">Sets or clears the bit at offset of the string value. Creates the key if it doesn&#39;t exist.</span> <span class="block text-xs !text-xs text-slate-500 dark:text-slate-500 leading-tight italic">O(1)</span> </div> </a> </li> </ul> </div> </div> <script> function toggleCommandGroup(button) { const content = document.getElementById(button.getAttribute('aria-controls')); const isExpanded = button.getAttribute('aria-expanded') === 'true'; const chevron = button.querySelector('.command-group-chevron'); button.setAttribute('aria-expanded', !isExpanded); content.classList.toggle('hidden'); chevron.classList.toggle('rotate-180'); } </script> <p>Bitmaps are not an actual data type, but a set of bit-oriented operations defined on the String type which is treated like a bit vector. Since strings are binary safe blobs and their maximum length is 512 MB, they are suitable to set up to 2^32 different bits.</p>