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command errod for fulltext creation
CREATE TAG INDEX nebula_index_1 ON player(name)-->CREATE FULLTEXT TAG INDEX nebula_index_1 ON player(name)

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17 changes: 10 additions & 7 deletions CONTRIBUTING.md
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Expand Up @@ -6,11 +6,11 @@

可以从以下方面进行贡献:

- 修正拼写错误或格式(标点,空格,缩进,代码块等)
- 修正或更新不适当或过时的描述
- 提交新文档
- 提交或解决文档[issues](https://github.com/vesoft-inc/nebula-docs-cn/issues)
- 审阅他人提交的 PR
- 修正拼写错误或格式(标点,空格,缩进,代码块等)
- 修正或更新不适当或过时的描述
- 提交新文档
- 提交或解决文档 [issue][_issues]
- 审阅他人提交的 PR

## 必须遵循的 Markdown 规范

Expand All @@ -22,5 +22,8 @@

可以选择以下方式进行贡献:

-[GitHub](https://github.com/vesoft-inc/nebula-docs-cn/issues) 提交 issue。
- Fork 文档,在本地分支上更改或添加新内容,然后向主分支提交 PR。
- 在 GitHub 提交 [issue][_issues]
- [Fork](https://github.com/vesoft-inc/nebula-docs-cn/fork) 文档,在本地分支上更改或添加新内容,然后向主分支提交 PR。


[_issues]: https://github.com/vesoft-inc/nebula-docs-cn/issues
2 changes: 1 addition & 1 deletion docs-2.0/1.introduction/1.what-is-nebula-graph.md
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Expand Up @@ -38,7 +38,7 @@ Nebula Graph支持严格的角色访问控制和LDAP(Lightweight Directory Acc

### 生态多样化

Nebula Graph开放了越来越多的原生工具,例如[Nebula Graph Studio](https://github.com/vesoft-inc/nebula-studio)[Nebula Console](https://github.com/vesoft-inc/nebula-console)[Nebula Exchange](https://github.com/vesoft-inc/nebula-spark-utils/tree/v2.0.0/nebula-exchange)等,更多工具可以查看 [生态工具概览](../20.appendix/6.eco-tool-version.md)
Nebula Graph开放了越来越多的原生工具,例如[Nebula Graph Studio](https://github.com/vesoft-inc/nebula-studio)[Nebula Console](https://github.com/vesoft-inc/nebula-console)[Nebula Exchange](https://github.com/vesoft-inc/nebula-exchange)等,更多工具可以查看 [生态工具概览](../20.appendix/6.eco-tool-version.md)

此外,Nebula Graph还具备与Spark、Flink、HBase等产品整合的能力,在这个充满挑战与机遇的时代,大大增强了自身的竞争力。

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18 changes: 9 additions & 9 deletions docs-2.0/1.introduction/2.data-model.md
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@@ -1,20 +1,20 @@
# 数据模型

本文介绍Nebula Graph的数据模型。数据模型是一种组织数据并说明它们如何相互关联的模型(schema)
本文介绍Nebula Graph的数据模型。数据模型是一种组织数据并说明它们如何相互关联的模型schema

## 数据模型

Nebula Graph数据模型使用6种基本的数据模型:

- 图空间(Space)
- 图空间Space)

图空间用于隔离不同团队或者项目的数据。不同图空间的数据是相互隔离的,可以指定不同的存储副本数、权限、分片等。

- 点(Vertex)

点用来保存实体对象,特点如下:

- 点是用点标识符(`VID`)标识的。`VID`在同一图空间中唯一。VID 是一个 int64, 或者 fixed_string(N)。
- 点是用点标识符(`VID`)标识的。`VID`在同一图空间中唯一。VID 是一个 int64或者 fixed_string(N)。
- 点必须有至少一个Tag,也可以有多个Tag。但不能没有Tag。

- 边(Edge)
Expand All @@ -25,7 +25,7 @@ Nebula Graph数据模型使用6种基本的数据模型:
- 边是有方向的,不存在无向边。
- 四元组 `<起点VID、Edge type、边排序值(Rank)、终点VID>` 用于唯一标识一条边。边没有EID。
- 一条边有且仅有一个Edge type。
- 一条边有且仅有一个rank。其为int64, 默认为0。
- 一条边有且仅有一个rank。其为int64默认为0。

- 标签(Tag)

Expand All @@ -51,17 +51,17 @@ Nebula Graph使用有向属性图模型,指点和边构成的图,这些边

| 类型 | 名称 | 属性名(数据类型) | 说明 |
| :--- | :--- | :---| :--- |
|Tag| **player** | name string <br>age (int) | 表示球员。 |
|Tag| **team** | name string | 表示球队。 |
|Edge type| **serve** | start_year int <br> end_year int | 表示球员的行为。<br>该行为将球员和球队联系起来,方向是从球员到球队。 |
|Edge type| **follow** | degreeint | 表示球员的行为。<br>该行为将两个球员联系起来,方向是从一个球员到另一个球员。 |
|Tag| **player** | name (string) <br>age(int) | 表示球员。 |
|Tag| **team** | name (string) | 表示球队。 |
|Edge type| **serve** | start_year (int) <br> end_year (int) | 表示球员的行为。<br>该行为将球员和球队联系起来,方向是从球员到球队。 |
|Edge type| **follow** | degree (int) | 表示球员的行为。<br>该行为将两个球员联系起来,方向是从一个球员到另一个球员。 |

!!! Note

Nebula Graph 中没有无向边,只支持有向边。

!!! compatibility

由于 Nebula Graph {{ nebula.release }} 的数据模型中,允许存在"悬挂边",因此在增删时,用户需自行保证“一条边所对应的起点和终点”的存在性。详见[INSERT VERTEX](../3.ngql-guide/12.vertex-statements/1.insert-vertex.md), [DELETE VERTEX](../3.ngql-guide/12.vertex-statements/4.delete-vertex.md), [INSERT EDGE](../3.ngql-guide/13.edge-statements/1.insert-edge.md), [DELETE EDGE](../3.ngql-guide/13.edge-statements/4.delete-edge.md)
由于 Nebula Graph {{ nebula.release }} 的数据模型中,允许存在"悬挂边",因此在增删时,用户需自行保证“一条边所对应的起点和终点”的存在性。详见[INSERT VERTEX](../3.ngql-guide/12.vertex-statements/1.insert-vertex.md)[DELETE VERTEX](../3.ngql-guide/12.vertex-statements/4.delete-vertex.md)[INSERT EDGE](../3.ngql-guide/13.edge-statements/1.insert-edge.md)[DELETE EDGE](../3.ngql-guide/13.edge-statements/4.delete-edge.md)

不支持 openCypher 中的 MERGE 语句。
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Expand Up @@ -20,7 +20,7 @@ Graph 服务主要负责处理查询请求,包括解析查询语句、校验

Parser 模块收到请求后,通过 Flex(词法分析工具)和 Bison(语法分析工具)生成的词法语法解析器,将语句转换为抽象语法树(AST),在语法解析阶段会拦截不符合语法规则的语句。

例如`GO FROM "Tim" OVER like WHERE like.likeness > 8.0 YIELD like._dst`语句转换的 AST 如下。
例如`GO FROM "Tim" OVER like WHERE properties(edge).likeness > 8.0 YIELD dst(edge)`语句转换的 AST 如下。

![AST](https://docs-cdn.nebula-graph.com.cn/docs-2.0/1.introduction/2.nebula-graph-architecture/parser-ast-tree.png)

Expand All @@ -38,7 +38,7 @@ Validator 模块对生成的 AST 进行语义校验,主要包括:

校验引用的变量是否存在或者引用的属性是否属于变量。

例如语句`$var = GO FROM "Tim" OVER like YIELD like._dst AS ID; GO FROM $var.ID OVER serve YIELD serve._dst`,Validator 模块首先会检查变量 `var` 是否定义,其次再检查属性 `ID` 是否属于变量 `var`
例如语句`$var = GO FROM "Tim" OVER like YIELD dst(edge) AS ID; GO FROM $var.ID OVER serve YIELD dst(edge)`,Validator 模块首先会检查变量 `var` 是否定义,其次再检查属性 `ID` 是否属于变量 `var`

- 校验类型推断

Expand All @@ -50,13 +50,13 @@ Validator 模块对生成的 AST 进行语义校验,主要包括:

查询语句中包含 `*` 时,校验子句时需要将 `*` 涉及的Schema都进行校验。

例如语句`GO FROM "Tim" OVER * YIELD like._dst, like.likeness, serve._dst`,校验`OVER`子句时需要校验所有的 Edge type,如果 Edge type 包含 `like``serve`,该语句会展开为`GO FROM "Tim" OVER like,serve YIELD like._dst, like.likeness, serve._dst`
例如语句`GO FROM "Tim" OVER * YIELD dst(edge), properties(edge).likeness, dst(edge)`,校验`OVER`子句时需要校验所有的 Edge type,如果 Edge type 包含 `like``serve`,该语句会展开为`GO FROM "Tim" OVER like,serve YIELD dst(edge), properties(edge).likeness, dst(edge)`

- 校验输入输出

校验管道符(|)前后的一致性。

例如语句`GO FROM "Tim" OVER like YIELD like._dst AS ID | GO FROM $-.ID OVER serve YIELD serve._dst`,Validator 模块会校验 `$-.ID` 在管道符左侧是否已经定义。
例如语句`GO FROM "Tim" OVER like YIELD dst(edge) AS ID | GO FROM $-.ID OVER serve YIELD dst(edge)`,Validator 模块会校验 `$-.ID` 在管道符左侧是否已经定义。

校验完成后,Validator 模块还会生成一个默认可执行,但是未进行优化的执行计划,存储在目录 `src/planner` 内。

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Expand Up @@ -142,6 +142,8 @@ EdgeA_Out和EdgeA_In以方向相反的两条边的形式存在于存储层,二

如EdgeA_Out和EdgeA_In一样,Nebula Graph冗余了存储每条边的信息,导致存储边所需的实际空间翻倍。因为边对应的Key占用的硬盘空间较小,但Value占用的空间与属性值的长度和数量成正比,所以,当边的属性值较大或数量较多时候,硬盘空间占用量会比较大。

如果对边进行操作,为了保证两个键值对的最终一致性,可以开启[TOSS功能](../../5.configurations-and-logs/1.configurations/3.graph-config.md),开启后,会先在正向边所在的分片进行操作,然后在反向边所在分片进行操作,最后返回结果。

### 分片算法

分片策略采用**静态 Hash**的方式,即对点VID进行取模操作,同一个点的所有Tag、出边和入边信息都会存储到同一个分片,这种方式极大地提升了查询效率。
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6 changes: 3 additions & 3 deletions docs-2.0/1.introduction/3.vid.md
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Expand Up @@ -28,7 +28,7 @@

- 可以使用`LOOKUP`或者`MATCH`语句,来通过属性索引查找对应的VID;

- 性能上,直接通过VID找到点的语句性能最高,例如`DELETE xxx WHERE id(xxx) == "player100"`, 或者`GO FROM "player100"`等语句。通过属性先查找VID,再进行图操作的性能会变差,例如`LOOKUP | GO FROM $-.ids`等语句,相比前者多了一次内存或硬盘的随机读(`LOOKUP`)以及一次序列化(`|`)。
- 性能上,直接通过VID找到点的语句性能最高,例如`DELETE xxx WHERE id(xxx) == "player100"`或者`GO FROM "player100"`等语句。通过属性先查找VID,再进行图操作的性能会变差,例如`LOOKUP | GO FROM $-.ids`等语句,相比前者多了一次内存或硬盘的随机读(`LOOKUP`)以及一次序列化(`|`)。

## VID生成建议

Expand All @@ -50,13 +50,13 @@ VID的数据类型必须在[创建图空间](../3.ngql-guide/9.space-statements/

## "查询起始点"(`start vid`)与全局扫描

绝大多数情况下,Nebula Graph 的查询语句(`MATCH`, `GO`, `LOOKUP`)的执行计划,必须要通过一定方式找到查询起始点的 VID (`start vid`)
绝大多数情况下,Nebula Graph 的查询语句`MATCH``GO``LOOKUP`的执行计划,必须要通过一定方式找到查询起始点的 VID`start vid`

定位 `start vid` 只有两种方式:

1. 例如 `GO FROM "player100" OVER` 是在语句中显式的指明 `start vid` 是 "player100";

2. 例如, `LOOKUP ON player WHERE player.name == "Tony Parker"` 或者 `MATCH (v:player {name:"Tony Parker"}) `,是通过属性 `player.name` 的索引来定位到 `start vid`
2. 例如 `LOOKUP ON player WHERE player.name == "Tony Parker"` 或者 `MATCH (v:player {name:"Tony Parker"}) `,是通过属性 `player.name` 的索引来定位到 `start vid`


!!! caution 不能在没有 `start vid` 情况下进行全局扫描;
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2 changes: 1 addition & 1 deletion docs-2.0/14.client/4.nebula-java-client.md
Original file line number Diff line number Diff line change
Expand Up @@ -101,7 +101,7 @@ try {
ResultSet resp = session.execute(insertEdges);

// query
String query = "GO FROM \"Bob\" OVER like " + "YIELD $$.person.name, $$.person.age, like.likeness";
String query = "GO FROM \"Bob\" OVER like " + "YIELD properties($$).name, properties($$).age, properties(edge).likeness";
ResultSet resp = session.execute(query);
printResult(resp);
}finally {
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