集群字符集默认为utf-8,设置集群为其他形式的字符集步骤如下：
以gbk字符集为例，设置集群使用gbk字符集：
1. 设置测试机的字符集为gbk
#查看当前字符集并修改为gbk
[gbase@liurui-node-0 ~]$ echo $LANG
zh_CN.UTF-8
[gbase@liurui-node-0 ~]$ export LANG='zh_CN.gbk'
[gbase@liurui-node-0 ~]$ echo $LANG
zh_CN.gbk
2. 设置所用软件编码方式为gbk
以cmd窗口为例，打开cmd窗口，右击鼠标选择编码方式然后再选择gbk。
3. 修改集群层、单机层配置文件，在[client]和[gbased]后添加变量 default_character_set=gbk,并重启集群服务
[client]
default_character_set=gbk
[gbased]
default_character_set=gbk
#查看修改后相关变量值
gbase> show variables like '%character%';
+--------------------------+--------------------------------------------+
| Variable_name | Value |
+--------------------------+--------------------------------------------+
| character_set_client | gbk |
| character_set_connection | gbk |
| character_set_database | gbk |
| character_set_filesystem | binary |
| character_set_results | gbk |
| character_set_server | gbk |
| character_set_sort | binary |
| character_set_system | utf8mb4 |
| character_sets_dir | /opt/gcluster/server/share/gbase/charsets/ |
+--------------------------+--------------------------------------------+
9 rows in set (Elapsed: 00:00:00.01)
修改字符集后需要重新建库，若在修改前建的库下执行建表操作，新建的表默认字符集仍为修改前字符集；修改字符集时需保证集群上所有节点字符集一致，否则各节点所建的表字符集不一致，执行dml语句时会报错。
#各节点字符集不一致时报错信息
gbase> show create table t3;
+-------+-----------------------------------------------------------------------------------------------+
|Table| Create Table |
+-------+-----------------------------------------------------------------------------------------------+
| t3 | CREATE TABLE "t3" (
"a" int(11) DEFAULT NULL,
"b" varchar(20) DEFAULT NULL
) ENGINE=EXPRESS DEFAULT CHARSET=gbk TABLESPACE='sys_tablespace' |
+-------+-----------------------------------------------------------------------------------------------+
1 row in set (Elapsed: 00:00:00.00)
gbase> insert into t3 values(2,'asd');
ERROR 1705 (HY000): gcluster DML error: Commit failed
ERROR NO: 1733ERROR DETAIL: (GBA-01EX-700) Gbase general error: (gns_host: 10.10.14.16) source table and destination table are not same: src:( localhost:test2.t3_n1 ) dst:( 10.10.11.231:test2.t3_n1 ) column type: [1]type: 1, precision: 60, scale: 0, is_lookup: 0, nulls_mode: 2, internal_size: 60, display_size: 20 -- type: 1, precision: 40, scale: 0, is_lookup: 0, nulls_mode: 2, internal_size: 40, display_size: 20
SQL: insert into t3 values(2,'asd')
