| 名称 | 查询方式 |
| DB_NAME | select name from v$database |
| INSTANCE_NAME | select instance_name from v$instance |
| ORACLE_SID | 值和INSTANCE_NAME相同 |
| DB_DOMAIN | select value from v$parameter where name="db_domain" |
| GLOBAL_NAME | DB_NAME.DB_DOMAIN |
| SERVICE_NAME | select value from v$parameter where name="service_name" |
| NET_SERVICE_NAME | 检查tnsnames.ora文件 |
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