HAWQ 操作笔记
2017-03-24 17:14
218 查看
1.HAWQ 是不支持主键和外建的,官方文档明确给出
Primary key and foreign key constraints are not supported in HAWQ. For inherited tables, table privileges are not inherited in the current implementation.
HAWQ also supports the parquet columnar storage format. Parquet tables can be more efficient for increasing performance on large queries.
Notes
Using OIDs in new applications is not recommended. Avoid assuming that OIDs are unique across tables; if you need a database-wide unique identifier, use the combination of table OID and row OID for the purpose.Primary key and foreign key constraints are not supported in HAWQ. For inherited tables, table privileges are not inherited in the current implementation.
HAWQ also supports the parquet columnar storage format. Parquet tables can be more efficient for increasing performance on large queries.
相关文章推荐
- HAWQ学习笔记 --- 操作命令大全
- delphi中流stream的操作.(个人笔记)
- Asp.NET开发笔记--文本框的数据绑定与操作
- [学习笔记]Java 中对文件的读写操作之比较
- ArcGIS 9.2 笔记(4):数据互操作
- 在ASP.net中的XML操作笔记一
- ArcGIS 9.2 笔记(4):数据互操作
- sqlserver操作练习笔记
- Win32学习笔记——键盘操作
- ajax 笔记--对CheckBoxList的简单操作
- 数据操作相关函数笔记
- MFC数据库操作笔记
- MFC数据库操作笔记
- (转载)Linux内核网络设备操作部分阅读笔记
- 服务器操作笔记
- xml学习笔记!(DOM的基本操作)
- linux操作笔记
- (原创)Linux内核网络设备操作部分阅读笔记
- php学习笔记5—(文件操作)
- ASP.NET2.0中Gridview中数据操作技巧[学习笔记]