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memcachedb - Online in the Cloud

Run memcachedb in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command memcachedb that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


memcachedb - persistence-enabled variant of memcached

SYNOPSIS


memcachedb [OPTIONS]

DESCRIPTION


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

It conforms to the memcache protocol, which means that memcached 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.

OPTIONS


-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 support)

-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 memory 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 option)

-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/memcachedb)

-G <dir>
Log directory of database (default: same as Environment 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 disable, 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 needed

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

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

-O Identifies another site participating in this replication group

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

-n <num>
Number of sites participating in replication (default: 2)

CAVEATS


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

Use memcachedb online using onworks.net services


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