序一次只能连接一个DB，而且不可以跨越DB执行查询语句。 关于数据库模版 每个新的数据库都是基于一个模版数据库创建的，这种创建可以理解为模板数据库 的复制，如果基于一个非空的模版数据库来创建，那么该模板数据库中的所有对象和数 据都会一模一样的复制到新创建的数据库中。缺省的数据库模版为template1，在初 始化GP系统初期可以连接到该库，在没有明确指定模版的情况下创建新的数据库将缺 18616691889) 编写：陈淼 - 84 - 可以用来创建仅包含标准对象的完全干净的数据库。如果想避免从template1中拷贝 任何的对象，可以考虑使用该模。 注意：在创建新的数据库时，模板数据库上必须没有任何连接，否则创建数据库的操作 将会报错失败。 创建数据库 通过CREATE DATABASE命令来创建一个新的数据库。例如： =# CREATE ITION TEMPLATE的 设置，而不是所谓的继承，基本上很多版本中，分区的存储设置不会自动从父级表继承， 需要明确指定，SUBPARTITION TEMPLATE与普通的继承不同，是一种预置的模板。 Greenplum Database 管理员指南 V6.2.1 版权所有：Esena(陈淼 +86 18616691889) 编写：陈淼 - 116 - 关于为分区表增加分区时

DATABASE 描述: 创建⼀个新的数据库 语法: CREATE DATABASE 数据库名称 [ [ WITH ] [ OWNER [=] 数据库属主 ] [ TEMPLATE [=] 模板 ] [ ENCODING [=] 编码 ] [ TABLESPACE [=] 表空间 ] ] 命令: CREATE FUNCTION 描述: 定义⼀个新的函数 语法: 输⼊参数，测试连接 接⼊第三⽅ BI ⼯具 Greenplum数据仓库 UDW Copyright © 2012-2021 UCloud 优刻得 168/206 这⾥需要注意Sqlalchemy Uri的写法： 前缀是：postgresql+psycopg2，后缀是：username:password@host:port/database 点击“TEST CONNECTION”，提⽰测试连接成

– 增加新节点只要在gp_segment_configuration里添加新节点信息即可 – 新节点以Master为模板生成，只包含catalog，没有数据 改进与实现 • 问题 – 生成模板的过程中，如果catalog被修改怎么保证一致性 改进与实现 • 问题 – 生成模板的过程中，如果catalog被修改怎么保证一致性 ▪ 新增catalog锁 ▪ select gp_expand_lock_catalog()

简称“欧拉”）编译测试了高级分 析数据平台 Greenplum，用实践证明了 Greenplum 与支持多样性计算的欧拉开源操作系统完全兼容，是 Greenplum 与中国本地 IT 厂商的深入合作的典型模板，大大丰富了中国本地国产化应用生态。本白皮书着眼介绍了欧拉开源操作系 统平台架构、创新性及核心特点， 同时介绍了 Greenplum 作为一款深受技术爱好者喜爱的、中立的纯开源软件，践行 “Run

PXF. PXF no longer supports specifying a DELIMITER in the CREATE EXTERNAL TABLE command LOCATION URI. Additional Greenplum Database Features Greenplum Database 6.0 also includes these features and changes As the root user, edit the OpenLDAP configuration file /etc/openldap/ldap.conf: SASL_NOCANON on URI ldaps://ldapA.example.priv ldaps://ldapB.example.priv ldaps://ldapC.example.priv BASE dc=example For certificate validation to succeed, the hostname in the certificate must match a hostname in the URI property. Otherwise, you must also add TLS_REQCERT allow to the file. VMware Greenplum v6.18 Documentation

PXF. PXF no longer supports specifying a DELIMITER in the CREATE EXTERNAL TABLE command LOCATION URI. Additional Greenplum Database Features Greenplum Database 6.0 also includes these features and changes As the root user, edit the OpenLDAP configuration file /etc/openldap/ldap.conf: SASL_NOCANON on URI ldaps://ldapA.example.priv ldaps://ldapB.example.priv ldaps://ldapC.example.priv BASE dc=example,dc=priv For certificate validation to succeed, the hostname in the certificate must match a hostname in the URI property. Otherwise, you must also add TLS_REQCERT allow to the file. VMware Greenplum v6.19 Documentation

As the root user, edit the OpenLDAP configuration file /etc/openldap/ldap.conf: SASL_NOCANON on URI ldaps://ldapA.example.priv ldaps://ldapB.example.priv ldaps://ldapC.example.priv BASE dc=example,dc=priv For certificate validation to succeed, the hostname in the certificate must match a hostname in the URI property. Otherwise, you must also add TLS_REQCERT allow to the file. VMware Greenplum v6.17 Documentation Protocol The file:// protocol is used in a URI that specifies the location of an operating system file. gpfdist:// Protocol The gpfdist:// protocol is used in a URI to reference a running gpfdist instance

PXF. PXF no longer supports specifying a DELIMITER in the CREATE EXTERNAL TABLE command LOCATION URI. Additional Greenplum Database Features Greenplum Database 6.0 also includes these features and changes As the root user, edit the OpenLDAP configuration file /etc/openldap/ldap.conf: SASL_NOCANON on URI ldaps://ldapA.example.priv ldaps://ldapB.example.priv ldaps://ldapC.example.priv BASE dc=example For certificate validation to succeed, the hostname in the certificate must match a hostname in the URI property. Otherwise, you must also add TLS_REQCERT allow to the file. 4. As the gpadmin user, edit

PXF. PXF no longer supports specifying a DELIMITER in the CREATE EXTERNAL TABLE command LOCATION URI. Additional Greenplum Database Features Greenplum Database 6.0 also includes these features and changes Protocol The file:// protocol is used in a URI that specifies the location of an operating system file. gpfdist:// Protocol The gpfdist:// protocol is used in a URI to reference a running gpfdist instance (.bz2), and zstd (.zst) files automatically. You must provide a URI that specifies the location of an operating system file(s). The URI includes the host name, port, and path to the file. Each file must

PXF. PXF no longer supports specifying a DELIMITER in the CREATE EXTERNAL TABLE command LOCATION URI. Additional Greenplum Database Features Greenplum Database 6.0 also includes these features and changes Protocol The file:// protocol is used in a URI that specifies the location of an operating system file. gpfdist:// Protocol The gpfdist:// protocol is used in a URI to reference a running gpfdist instance bz2), and zstd (.zst) files automatically. You must provide a URI that specifies the location of an operating system file(s). The URI includes the host name, port, and path to the file. Each file must