Along with possible performance difference, architecturally partitions on Oracle and PostgreSQL act quite differently. On Oracle you can define a Range, for example each month or year being a partition, or a list, where every occurrence of say the letter “N” or “Y” in a char field is ...
PostgreSQL 的函数内部支持DDL(create, drop, alter)和DML(insert.delete,update),而Oracle 的函数只支持DML,存储过程则支持DDL和DML。因此,对于我们在PostgreSQL 中定义的函数,那些内部没有DDL 语句,且运行时会不进行DDL操作的,应该被改造为Oracle的函数;而那些内部有DDL 语句(create, drop, alter),或者运行时会进...
select 'grant select on schN.'||tablename||' to newUN;' from pg_tables where schemaName='schN' and tableowner='oldUN'; #批量赋权 select pid, query from pg_stat_cluster_activity where query like '%tbname%' and nodename like '%cn%'; #查询死锁 select pid, query from pg_stat_cluster...
让我们再看一个更为常见的场景,从其他数据库迁移过来的朋友,可能会去选择使用 char (我就遇到了这样的场景),但是在 PostgreSQL 中是不推荐使用 char,优先使用 varchar 和 text,这在官网上也有说明 There is no performance difference among these three types, apart from increased storage space when using the...
作者:Baji Shaik and Sudip Acharya 来源:https://aws.amazon.com/cn/blogs/database/converting-the-sysdate-function-from-oracle-to-postgresql/ 译者:多米爸比 在AWS Cloud 中迁移Oracle数据库到PostgreSQL数据库是一个复杂的过程,从最初评估阶段到迁移转换阶段,多个阶段过程中会涉及不同的技术和技能。有关迁移...
Migration process and infrastructure considerations Source database considerations Target database considerations for the PostgreSQL environment Oracle数据库迁移到Amazon RDS或者Amazon Aurora 环境下的PostgreSQL数据库时,最常见的问题之一是SYSDATE函数。应用程序或存储过程以及触发器中最常用的日期/时间函数是SYSDATE。
CREATE SEQUENCE seqname [ INCREMENT BY integer ] [ MINVALUE integer ] [ MAXVALUE integer ] [ START WITH integer ] [ CACHE integer ] [ CYCLE | NOCYCLE ] Oracle’s “create sequence” has other arguments not listed here and not supported by PostgreSQL, but the main difference is the need...
https://www.geeksforgeeks.org/postgresql-difference-between-char-varchar-and-text/ oracle中null的行为 SQL> select 1 from dual where '' = ''; no rows selected SQL> select 1 from dual where null = null; no rows selected ...
Ora2Pg is a free tool used to migrate an Oracle database to a PostgreSQL compatible schema. It connects your Oracle database, scan it automatically and extracts its structure or data, it then generates SQL scripts that you can load into PostgreSQL. - dar
Is there any syntax difference between Oracle and PostgreSQL? chevron_right PostgreSQL supports ANSI SQL standard SQL syntax and data types, whereas Oracle does not support the same standard; additionally, it includes some non-ANSI SQL syntaxes. Using tools, unsupported objects...