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memcachedb - Persistent storage engine using the memcache protocol…  more info»


MEMCACHEDB(1)                                          MEMCACHEDB(1)

       memcachedb - persistence-enabled variant of memcached

       memcachedb [OPTIONS]

       MemcacheDB  (pronounced  mem-cash-dee-bee)  is a persistence-
       enabled variant of the memcached distributed key-value  stor‐
       age  system. It is NOT a cache solution, but rather a persis‐
       tent storage engine for fast  and  reliable  key-value  based
       object storage and retrieval.

       It  conforms  to the memcache protocol, which means that mem‐
       cached clients can connect and use the  persistent  key-value
       store  transparently.  It also provides reliability and high-
       availability through its transaction and replication support,
       courtesy of its BerkeleyDB storage backend.

       -p <num>
              TCP port to listen on  (default: 21201)

       -U <num>
              UDP port to listen on (default: 0, off)

       -s <file>
              UNIX Domain Socket path to listen on (disables network

       -a <mask>
              Access mask for unix socket, in octal (default: 0700)

       -l <ip_addr>
              Interface to listen on (default: INADRR_ANY)

       -d     Run as a daemon

       -r     Maximize core file limit

       -u <username>
              Assume identity of <username> (only when run as root)

       -c <num>
              Maximum simultaneous connections (default: 4096)

       -b <num>
              Item size smaller than <num> bytes will use fast  mem‐
              ory allocation (default: 2048 bytes)

       -v     Verbose (print errors/warnings while in event loop)

       -vv    Very verbose (also print client commands/reponses)

       -h     Print brief usage instructions and exit

       -i     Print complete copyright and license information

       -P <file>
              Save  process  ID  in  <file>  (only  used with the -d

       -t <num>
              Number of threads to use (default: 4)

   Berkeley DB Options
       -m <num>
              In-memory  cache  size  of  BerkeleyDB  in   megabytes
              (default: 256MB)

       -A <num>
              Underlying  page  size in bytes (default: 4096, range:
              512B-64KB, power-of-two)

       -f <file>
              Filename of database (default: data.db)

       -H <dir>
              Environment HOME  of  database  (default:  /data1/mem‐

       -G <dir>
              Log  directory  of database (default: same as Environ‐
              ment HOME, see -H)

       -B <db_type>
              Type of  database,  options  are:  'btree'  or  'hash'
              (default: btree)

       -L <num>
              Log buffer size in kBytes (default: 4096kB)

       -C <num>
              Perform  a  checkpoint  every <num> seconds (0 to dis‐
              able, default: 300 seconds)

       -T <num>
              Do memp_trickle every <num>  seconds  (0  to  disable,
              default: 30 seconds)

       -e <num>
              Percentage  of  the  pages in the cache that should be
              clean (default: 60%)

       -D <num>
              Perform deadlock detection every <num> milliseconds (0
              to disable, default: 100ms)

       -N     Enable  DB_TXN_NOSYNC  for  a  large  performance gain
              (default: off)

       -E     Automatically remove log  files  that  are  no  longer

       -X     Allocate region memory from the heap (default: off)

   Replication Options
       -R     Identifies  the  host  and  port  used  by  this  site

       -O     Identifies another site participating in this replica‐
              tion group

       -M/-S  Start memcachedb as a master or slave

       -n <num>
              Number of sites participating in replication (default:

       ·   Because this is a  persistent  storage  solution,  expire
           time  specified  in  the  corresponding memcache protocol
           clients will be silently discarded.



       MemcacheDB  was  written  and  is  maintained  by  Steve  Chu
       <>,  based on Memcached by Danga Interactive,
       Inc. <>

                           05 February 11              MEMCACHEDB(1)
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