diff -urN zabbix-3.0.1.orig/database/ibm_db2/schema.sql zabbix-3.0.1/database/ibm_db2/schema.sql
--- zabbix-3.0.1.orig/database/ibm_db2/schema.sql	2016-02-26 04:46:48.000000000 -0500
+++ zabbix-3.0.1/database/ibm_db2/schema.sql	2016-04-11 12:03:02.000000000 -0400
@@ -273,7 +273,7 @@
 	itemid                   bigint                                    NOT NULL,
 	type                     integer         WITH DEFAULT '0'          NOT NULL,
 	snmp_community           varchar(64)     WITH DEFAULT ''           NOT NULL,
-	snmp_oid                 varchar(255)    WITH DEFAULT ''           NOT NULL,
+	snmp_oid                 varchar(511)    WITH DEFAULT ''           NOT NULL,
 	hostid                   bigint                                    NOT NULL,
 	name                     varchar(255)    WITH DEFAULT ''           NOT NULL,
 	key_                     varchar(255)    WITH DEFAULT ''           NOT NULL,
diff -urN zabbix-3.0.1.orig/database/mysql/schema.sql zabbix-3.0.1/database/mysql/schema.sql
--- zabbix-3.0.1.orig/database/mysql/schema.sql	2016-02-26 04:46:49.000000000 -0500
+++ zabbix-3.0.1/database/mysql/schema.sql	2016-04-11 12:02:52.000000000 -0400
@@ -273,7 +273,7 @@
 	`itemid`                 bigint unsigned                           NOT NULL,
 	`type`                   integer         DEFAULT '0'               NOT NULL,
 	`snmp_community`         varchar(64)     DEFAULT ''                NOT NULL,
-	`snmp_oid`               varchar(255)    DEFAULT ''                NOT NULL,
+	`snmp_oid`               varchar(511)    DEFAULT ''                NOT NULL,
 	`hostid`                 bigint unsigned                           NOT NULL,
 	`name`                   varchar(255)    DEFAULT ''                NOT NULL,
 	`key_`                   varchar(255)    DEFAULT ''                NOT NULL,
diff -urN zabbix-3.0.1.orig/database/oracle/schema.sql zabbix-3.0.1/database/oracle/schema.sql
--- zabbix-3.0.1.orig/database/oracle/schema.sql	2016-02-26 04:46:48.000000000 -0500
+++ zabbix-3.0.1/database/oracle/schema.sql	2016-04-11 12:03:17.000000000 -0400
@@ -273,7 +273,7 @@
 	itemid                   number(20)                                NOT NULL,
 	type                     number(10)      DEFAULT '0'               NOT NULL,
 	snmp_community           nvarchar2(64)   DEFAULT ''                ,
-	snmp_oid                 nvarchar2(255)  DEFAULT ''                ,
+	snmp_oid                 nvarchar2(511)  DEFAULT ''                ,
 	hostid                   number(20)                                NOT NULL,
 	name                     nvarchar2(255)  DEFAULT ''                ,
 	key_                     nvarchar2(255)  DEFAULT ''                ,
diff -urN zabbix-3.0.1.orig/database/postgresql/schema.sql zabbix-3.0.1/database/postgresql/schema.sql
--- zabbix-3.0.1.orig/database/postgresql/schema.sql	2016-02-26 04:46:49.000000000 -0500
+++ zabbix-3.0.1/database/postgresql/schema.sql	2016-04-11 12:02:36.000000000 -0400
@@ -273,7 +273,7 @@
 	itemid                   bigint                                    NOT NULL,
 	type                     integer         DEFAULT '0'               NOT NULL,
 	snmp_community           varchar(64)     DEFAULT ''                NOT NULL,
-	snmp_oid                 varchar(255)    DEFAULT ''                NOT NULL,
+	snmp_oid                 varchar(511)    DEFAULT ''                NOT NULL,
 	hostid                   bigint                                    NOT NULL,
 	name                     varchar(255)    DEFAULT ''                NOT NULL,
 	key_                     varchar(255)    DEFAULT ''                NOT NULL,
diff -urN zabbix-3.0.1.orig/database/sqlite3/schema.sql zabbix-3.0.1/database/sqlite3/schema.sql
--- zabbix-3.0.1.orig/database/sqlite3/schema.sql	2016-02-26 04:46:49.000000000 -0500
+++ zabbix-3.0.1/database/sqlite3/schema.sql	2016-04-11 12:03:28.000000000 -0400
@@ -273,7 +273,7 @@
 	itemid                   bigint                                    NOT NULL,
 	type                     integer         DEFAULT '0'               NOT NULL,
 	snmp_community           varchar(64)     DEFAULT ''                NOT NULL,
-	snmp_oid                 varchar(255)    DEFAULT ''                NOT NULL,
+	snmp_oid                 varchar(511)    DEFAULT ''                NOT NULL,
 	hostid                   bigint                                    NOT NULL REFERENCES hosts (hostid) ON DELETE CASCADE,
 	name                     varchar(255)    DEFAULT ''                NOT NULL,
 	key_                     varchar(255)    DEFAULT ''                NOT NULL,
diff -urN zabbix-3.0.1.orig/include/db.h zabbix-3.0.1/include/db.h
--- zabbix-3.0.1.orig/include/db.h	2016-02-26 04:45:45.000000000 -0500
+++ zabbix-3.0.1/include/db.h	2016-04-11 11:59:50.000000000 -0400
@@ -106,7 +106,7 @@
 #define ITEM_UNITS_LEN			255
 #define ITEM_SNMP_COMMUNITY_LEN		64
 #define ITEM_SNMP_COMMUNITY_LEN_MAX	(ITEM_SNMP_COMMUNITY_LEN + 1)
-#define ITEM_SNMP_OID_LEN		255
+#define ITEM_SNMP_OID_LEN		511
 #define ITEM_SNMP_OID_LEN_MAX		(ITEM_SNMP_OID_LEN + 1)
 #define ITEM_ERROR_LEN			2048
 #define ITEM_ERROR_LEN_MAX		(ITEM_ERROR_LEN + 1)
diff -urN zabbix-3.0.1.orig/src/libs/zbxdbupgrade/dbupgrade_3000.c zabbix-3.0.1/src/libs/zbxdbupgrade/dbupgrade_3000.c
--- zabbix-3.0.1.orig/src/libs/zbxdbupgrade/dbupgrade_3000.c	2016-02-26 04:45:46.000000000 -0500
+++ zabbix-3.0.1/src/libs/zbxdbupgrade/dbupgrade_3000.c	2016-04-11 14:33:51.000000000 -0400
@@ -33,6 +33,13 @@
 	return SUCCEED;
 }
 
+static int  DBpatch_3000001(void)
+{
+ const ZBX_FIELD field = {"snmp_oid", "", NULL, NULL, 511, ZBX_TYPE_CHAR, ZBX_NOTNULL, 0};
+
+ return DBmodify_field_type("items", &field);
+}
+
 #endif
 
 DBPATCH_START(3000)
@@ -40,5 +47,6 @@
 /* version, duplicates flag, mandatory flag */
 
 DBPATCH_ADD(3000000, 0, 1)
+DBPATCH_ADD(3000001, 0, 0)
 
 DBPATCH_END()