diff --git a/redis.conf b/redis.conf
index bb30dcae60fb65a357b9dff1939da05d505337e0..5ec2d0295dd373c957a5c862782d9a4d2d0bb3cb 100644
--- a/redis.conf
+++ b/redis.conf
@@ -191,6 +191,18 @@ slave-serve-stale-data yes
 # volatile-random -> remove a random key with an expire set
 # allkeys->random -> remove a random key, any key
 # volatile-ttl -> remove the key with the nearest expire time (minor TTL)
+# noeviction -> don't expire at all, just return an error on write operations
+# 
+# Note: with all the kind of policies, Redis will return an error on write
+#       operations, when there are not suitable keys for eviction.
+#
+#       At the date of writing this commands are: set setnx setex append
+#       incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd
+#       sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby
+#       zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby
+#       getset mset msetnx exec sort
+#
+# The default is:
 #
 # maxmemory-policy volatile-lru
 
diff --git a/src/config.c b/src/config.c
index 772ac764ed986052ddcc1359b4174b0bb2aa5628..ad60cced36affb06772c45b07cdfe781af66d262 100644
--- a/src/config.c
+++ b/src/config.c
@@ -136,6 +136,8 @@ void loadServerConfig(char *filename) {
                 server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
             } else if (!strcasecmp(argv[1],"allkeys-random")) {
                 server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
+            } else if (!strcasecmp(argv[1],"noeviction")) {
+                server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
             } else {
                 err = "Invalid maxmemory policy";
                 goto loaderr;
@@ -307,6 +309,8 @@ void configSetCommand(redisClient *c) {
             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_LRU;
         } else if (!strcasecmp(o->ptr,"allkeys-random")) {
             server.maxmemory_policy = REDIS_MAXMEMORY_ALLKEYS_RANDOM;
+        } else if (!strcasecmp(o->ptr,"noeviction")) {
+            server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
         } else {
             goto badfmt;
         }
@@ -440,6 +444,7 @@ void configGetCommand(redisClient *c) {
         case REDIS_MAXMEMORY_VOLATILE_RANDOM: s = "volatile-random"; break;
         case REDIS_MAXMEMORY_ALLKEYS_LRU: s = "allkeys-lru"; break;
         case REDIS_MAXMEMORY_ALLKEYS_RANDOM: s = "allkeys-random"; break;
+        case REDIS_MAXMEMORY_NO_EVICTION: s = "noeviction"; break;
         default: s = "unknown"; break; /* too harmless to panic */
         }
         addReplyBulkCString(c,"maxmemory-policy");
diff --git a/src/redis.c b/src/redis.c
index 67bdc3ad9f2040b7b16188d2e341433d88dd6206..fe656de9b0c941565980dd0cc32aa99b0431fd8b 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -124,7 +124,7 @@ struct redisCommand readonlyCommandTable[] = {
     {"zcount",zcountCommand,4,0,NULL,1,1,1},
     {"zrevrange",zrevrangeCommand,-4,0,NULL,1,1,1},
     {"zcard",zcardCommand,2,0,NULL,1,1,1},
-    {"zscore",zscoreCommand,3,REDIS_CMD_DENYOOM,NULL,1,1,1},
+    {"zscore",zscoreCommand,3,0,NULL,1,1,1},
     {"zrank",zrankCommand,3,0,NULL,1,1,1},
     {"zrevrank",zrevrankCommand,3,0,NULL,1,1,1},
     {"hset",hsetCommand,4,REDIS_CMD_DENYOOM,NULL,1,1,1},
@@ -1332,6 +1332,8 @@ void monitorCommand(redisClient *c) {
 void freeMemoryIfNeeded(void) {
     /* Remove keys accordingly to the active policy as long as we are
      * over the memory limit. */
+    if (server.maxmemory_policy == REDIS_MAXMEMORY_NO_EVICTION) return;
+
     while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) {
         int j, k, freed = 0;
 
diff --git a/src/redis.h b/src/redis.h
index 30c88f405b0969c523495ace949f41ededed9b9d..087002bf72fe44e8ccdb9494270ec1595b1b197c 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -209,6 +209,7 @@
 #define REDIS_MAXMEMORY_VOLATILE_RANDOM 2
 #define REDIS_MAXMEMORY_ALLKEYS_LRU 3
 #define REDIS_MAXMEMORY_ALLKEYS_RANDOM 4
+#define REDIS_MAXMEMORY_NO_EVICTION 5
 
 /* We can print the stacktrace, so our assert is defined this way: */
 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))