diff --git a/sources/config.c b/sources/config.c
index 45305e8f..c0f03379 100644
--- a/sources/config.c
+++ b/sources/config.c
@@ -88,6 +88,8 @@ typedef struct
 	od_parser_t parser;
 	od_log_t *log;
 	od_scheme_t *scheme;
+	char *data;
+	int data_size;
 } od_config_t;
 
 #define od_keyword(name, token) { token, name, sizeof(name) - 1 }
@@ -148,7 +150,7 @@ static od_keyword_t od_config_keywords[] =
 };
 
 static int
-od_config_read(od_config_t *config, char *config_file)
+od_config_open(od_config_t *config, char *config_file)
 {
 	/* read file */
 	struct stat st;
@@ -178,14 +180,19 @@ od_config_read(od_config_t *config, char *config_file)
 		         config_file);
 		return -1;
 	}
-	config->scheme->data = config_buf;
-	config->scheme->data_size = st.st_size;
 	config->scheme->config_file = config_file;
-	od_parser_init(&config->parser, config->scheme->data,
-	               config->scheme->data_size);
+	config->data = config_buf;
+	config->data_size = st.st_size;
+	od_parser_init(&config->parser, config->data, config->data_size);
 	return 0;
 }
 
+static void
+od_config_close(od_config_t *config)
+{
+	free(config->data);
+}
+
 static void
 od_config_error(od_config_t *config, od_token_t *token, char *fmt, ...)
 {
@@ -262,7 +269,17 @@ od_config_next_string(od_config_t *config, char **value)
 		od_config_error(config, &token, "expected 'string'");
 		return false;
 	}
-	*value = token.value.string.pointer;
+	char *copy = malloc(token.value.string.size + 1);
+	if (copy == NULL) {
+		od_parser_push(&config->parser, &token);
+		od_config_error(config, &token, "memory allocation error");
+		return false;
+	}
+	memcpy(copy, token.value.string.pointer, token.value.string.size);
+	copy[token.value.string.size] = 0;
+	if (*value)
+		free(*value);
+	*value = copy;
 	return true;
 }
 
@@ -822,13 +839,14 @@ od_config_parse(od_config_t *config)
 int od_config_load(od_scheme_t *scheme, od_log_t *log, char *config_file)
 {
 	od_config_t config;
-	memset(&config.parser, 0, sizeof(config.parser));
+	memset(&config, 0, sizeof(config));
 	config.log = log;
 	config.scheme = scheme;
 	int rc;
-	rc = od_config_read(&config, config_file);
+	rc = od_config_open(&config, config_file);
 	if (rc == -1)
 		return -1;
 	rc = od_config_parse(&config);
+	od_config_close(&config);
 	return rc;
 }
diff --git a/sources/parser.h b/sources/parser.h
index f9f63a21..f7b5e535 100644
--- a/sources/parser.h
+++ b/sources/parser.h
@@ -147,7 +147,6 @@ od_parser_next(od_parser_t *parser, od_token_t *token)
 		}
 		token->value.string.size =
 			parser->pos - token->value.string.pointer;
-		*parser->pos = 0;
 		parser->pos++;
 		return token->type;
 	}
diff --git a/sources/scheme.c b/sources/scheme.c
index 467eb77b..db949225 100644
--- a/sources/scheme.c
+++ b/sources/scheme.c
@@ -24,8 +24,6 @@
 void od_scheme_init(od_scheme_t *scheme)
 {
 	scheme->config_file = NULL;
-	scheme->data = NULL;
-	scheme->data_size = 0;
 	scheme->daemonize = 0;
 	scheme->log_debug = 0;
 	scheme->log_config = 0;
@@ -76,8 +74,6 @@ void od_scheme_free(od_scheme_t *scheme)
 		storage = od_container_of(i, od_schemestorage_t, link);
 		od_schemestorage_unref(storage);
 	}
-	if (scheme->data)
-		free(scheme->data);
 }
 
 od_schemestorage_t*
@@ -113,12 +109,28 @@ void od_schemestorage_ref(od_schemestorage_t *storage)
 
 void od_schemestorage_unref(od_schemestorage_t *storage)
 {
-	if (storage->refs == 0) {
-		od_list_unlink(&storage->link);
-		free(storage);
+	if (storage->refs > 0)
+		--storage->refs;
+	if (storage->refs > 0)
 		return;
-	}
-	storage->refs--;
+	if (storage->name)
+		free(storage->name);
+	if (storage->type)
+		free(storage->type);
+	if (storage->host)
+		free(storage->host);
+	if (storage->tls)
+		free(storage->tls);
+	if (storage->tls_ca_file)
+		free(storage->tls_ca_file);
+	if (storage->tls_key_file)
+		free(storage->tls_key_file);
+	if (storage->tls_cert_file)
+		free(storage->tls_cert_file);
+	if (storage->tls_protocols)
+		free(storage->tls_protocols);
+	od_list_unlink(&storage->link);
+	free(storage);
 }
 
 od_schemedb_t*
@@ -162,7 +174,6 @@ od_schemeuser_add(od_schemedb_t *db)
 	user->pool_cancel = 1;
 	user->pool_discard = 1;
 	user->pool_rollback = 1;
-	user->pool_sz = "session";
 	user->pool = OD_PSESSION;
 	od_list_init(&user->link);
 	od_list_append(&db->users, &user->link);
@@ -312,7 +323,13 @@ int od_scheme_validate(od_scheme_t *scheme, od_log_t *log)
 				         db->name, user->user);
 				return -1;
 			}
-			/* remote pooling mode */
+
+			/* pooling mode */
+			if (! user->pool_sz) {
+				od_error(log, "config", "db '%s' user '%s': pooling mode is not set",
+				         db->name, user->user);
+				return -1;
+			}
 			if (strcmp(user->pool_sz, "session") == 0) {
 				user->pool = OD_PSESSION;
 			} else
diff --git a/sources/scheme.h b/sources/scheme.h
index e57deca9..88c68270 100644
--- a/sources/scheme.h
+++ b/sources/scheme.h
@@ -107,8 +107,6 @@ struct od_schemeuser
 struct od_scheme
 {
 	char          *config_file;
-	char          *data;
-	int            data_size;
 	/* main */
 	int            daemonize;
 	int            log_debug;