【多选题】KSQL 命令列出数据库中的所有角色或用户的元命令是什么？
-
\dr -
\du -
\dn -
\dg
解题思路：
通过 ksql 连接 Kingbase 数据库执行命令查看：
sql
-- 查看对应命令的帮助：
Informational
(options: S = show system objects, + = additional detail)
\d[S+] list tables, views, and sequences
\d[S+] NAME describe table, view, sequence, or index
\da[S] [PATTERN] list aggregates
\dA[+] [PATTERN] list access methods
\db[+] [PATTERN] list tablespaces
\dc[S+] [PATTERN] list conversions
\dC[+] [PATTERN] list casts
\dd[S] [PATTERN] show object descriptions not displayed elsewhere
\dD[S+] [PATTERN] list domains
\ddp [PATTERN] list default privileges
\dE[S+] [PATTERN] list foreign tables
\det[+] [PATTERN] list foreign tables
\des[+] [PATTERN] list foreign servers
\deu[+] [PATTERN] list user mappings
\dew[+] [PATTERN] list foreign-data wrappers
\df[anptw][S+] [PATRN] list [only agg/normal/procedures/trigger/window] functions
\dF[+] [PATTERN] list text search configurations
\dFd[+] [PATTERN] list text search dictionaries
\dFp[+] [PATTERN] list text search parsers
\dFt[+] [PATTERN] list text search templates
\dg[S+] [PATTERN] list roles
\di[S+] [PATTERN] list indexes
\dl list large objects, same as \lo_list
\dL[S+] [PATTERN] list procedural languages
\dm[S+] [PATTERN] list materialized views
\dn[S+] [PATTERN] list schemas
\do[S] [PATTERN] list operators
\dO[S+] [PATTERN] list collations
\dp [PATTERN] list table, view, and sequence access privileges
\dpkg[S+] [PATTERN] list packages
\dP[itn+] [PATTERN] list [only index/table] partitioned relations [n=nested]
\drds [PATRN1 [PATRN2]] list per-database role settings
\dRp[+] [PATTERN] list replication publications
\dRs[+] [PATTERN] list replication subscriptions
\ds[S+] [PATTERN] list sequences
\dt[S+] [PATTERN] list tables
\dT[S+] [PATTERN] list data types
\du[S+] [PATTERN] list roles
\dv[S+] [PATTERN] list views
\dx[+] [PATTERN] list extensions
\dy [PATTERN] list event triggers
\l[+] [PATTERN] list databases
\sf[+] FUNCNAME show a function's definition
\sv[+] VIEWNAME show a view's definition
\z [PATTERN] same as \dp
-- 测试选项中的命令输出
test=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------+-----------
kcluster | Cannot login | {}
sao | No inheritance | {}
sso | No inheritance | {}
system | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
test=# \dg
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------+-----------
kcluster | Cannot login | {}
sao | No inheritance | {}
sso | No inheritance | {}
system | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
test=# \dr
invalid command \dr
Try \? for help.
test=# \dn
List of schemas
Name | Owner
------------------+--------
anon | system
dbms_sql | system
perf | system
public | system
src_restrict | system
sys_hm | system
sysaudit | system
sysmac | system
wmsys | system
xlog_record_read | system
(10 rows)可以看到 \du 和 \dg 都是查看角色信息的命令，而 \dr 命令不存在，\dn 是查看模式信息。
📚 推荐阅读：DBA 学习之路
如果这篇文章对你有帮助，推荐访问我的 Oracle DBA 系统学习站点，涵盖 100 天完整学习路线：
- 🔧 Oracle 安装部署 · RMAN 备份恢复 · Data Pump 数据迁移
- 🏗️ RAC 高可用 · DataGuard 容灾 · 多租户架构
- 🔍 故障排查 · 升级迁移 · GoldenGate 数据同步