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Update 6.clear-space.md #2414

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Dec 23, 2022
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Update 6.clear-space.md #2414

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Update 6.clear-space.md
abby-cyber Dec 22, 2022
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abby-cyber Dec 22, 2022
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13 changes: 9 additions & 4 deletions docs-2.0/3.ngql-guide/9.space-statements/6.clear-space.md
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Expand Up @@ -2,6 +2,11 @@

`CLEAR SPACE`语句用于清空图空间中的点和边，但不会删除图空间本身以及其中的 Schema 信息。


!!! note

建议在执行`CLEAR SPACE`操作之后，立即执行[`SUBMIT JOB COMPACT`](../../4.job-statements/#submit_job_compact)操作以提升查询性能。需要注意的是，COMPACT 操作可能会影响查询性能，建议在业务低峰期（例如凌晨）执行该操作。

## 权限要求

只有 [God 角色](../../7.data-security/1.authentication/3.role-list.md)的用户可以执行`CLEAR SPACE`语句。
Expand All @@ -13,15 +18,15 @@
- 图空间中的数据量越大，`CLEAR SPACE`消耗的时间越长。如果`CLEAR SPACE`的执行因客户端连接超时而失败，可以增大 [Graph 服务配置](../../5.configurations-and-logs/1.configurations/3.graph-config.md)中`storage_client_timeout_ms`参数的值。
- 在`CLEAR SPACE`的执行过程中，向该图空间写入数据的行为不会被自动禁止。这样的写入行为可能导致`CLEAR SPACE`清除数据不完全，残留的数据也可能受到损坏。

!!! note
!!! note

- 社区版 NebulaGraph 不支持在运行`CLEAR SPACE`的同时禁止写入。
社区版 NebulaGraph 不支持在运行`CLEAR SPACE`的同时禁止写入。

{{ ent.ent_begin }}

!!! enterpriseonly
!!! enterpriseonly

- 企业版 NebulaGraph 支持先运行`SET VARIABLE read_only=true`阻止向 NebulaGraph 写入数据，再运行`CLEAR SPACE`。数据清除成功后运行`SET VARIABLE read_only=false`即可重新允许写入。
企业版 NebulaGraph 支持先运行`SET VARIABLE read_only=true`阻止向 NebulaGraph 写入数据，再运行`CLEAR SPACE`。数据清除成功后运行`SET VARIABLE read_only=false`即可重新允许写入。

{{ ent.ent_end }}

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