SELECT truncate_all_tables_in_schema('your_schema_name'); -- 替换为你的schema名称 3. 确认所有表已成功清空 最后,你可以通过查询系统视图或使用其他方法(如检查表中的数据量)来确认所有表是否已成功清空。 由于TRUNCATE TABLE是一个DDL命令,它会立即生效并删除表中的所有数据,因此通常不需要额外的确认步骤...
当适用对象是表的时候,B 可以是ALL TABLES IN SCHEMA schema_name [, ...]; 当适用对象是 SEQUENCE 的时候,B 可以是ALL SEQUENCES IN SCHEMA schema_name [, ...]; 当适用对象是 FUNCTION | PROCEDURE | ROUTINE 的时候,B 可以是ALL { FUNCTIONS | PROCEDURES | ROUTINES } IN SCHEMA schema_name [,...
定义默认的访问权限。 ALTERDEFAULTPRIVILEGES[FOR{ROLE|USER}target_role[,...]][INSCHEMAschema_name[,...]]abbreviated_grant_or_revoke where abbreviated_grant_or_revoke is oneof:GRANT{{SELECT|INSERT|UPDATE|DELETE|TRUNCATE|REFERENCES|TRIGGER}[,...]|ALL[PRIVILEGES]}ONTABLESTO{[GROUP]role_name|PUBL...
If several large tables all become eligible for vacuuming in a short amount of time, all autovacuum. Note that the number of running workers does not count towards max_connections or superuser_reserved_connections limits. 如果有好几个大表在很短的时间内都有被自动垃圾回收选中,那么很可能导致自动垃...
test=# grant USAGE on SCHEMA mytest to test;GRANTtest1=> grant SELECT on ALL tables in schema mytest to test; 测试就不演示了,只是需要注意一点,要赋权两个,usage和select,两者缺一不可,也就是说必须是两个命令!!! OK,以上是用户test赋权select到test数据库下的mytest这个schema,下面为了继续测试,...
ALTER DEFAULT PRIVILEGES [ FOR { ROLE | USER } target_role [, ...] ] [ IN SCHEMA schema_name [, ...] ] abbreviated_grant_or_revoke where abbreviated_grant_or_revoke is one of: GRANT { { SELECT | INSERT | UPDATE | DELETE | TRUNCATE | REFERENCES | TRIGGER } [, ...] | ALL ...
GRANT INSERT, SELECT, UPDATE, DELETE, TRUNCATE, REFERENCES, TRIGGER ON TABLESTOpublic; 在为模式下的所有Sequence序列对象赋予权限时,需要将权限拆分为各种不同的Sequence操作,如: ALTER DEFAULT PRIVILEGES IN SCHEMAmyschema GRANT SELECT, UPDATE, USAGE ON SEQUENCES TOpublic; ...
Tables greater than 2GB should always be considered for partitioning. Tables containing historical data, in which new data is added into the newest partition. A typical example is a historical table where only the current month's data is updatable and the other 11 months are read only. ...
GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO username; 6)授予public模式中所有序列的所有权限给用户: GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO username; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. ...
在迁移过程中源数据库不支持 DDL 操作,仅支持 DML 和 TRUNCATE 操作。 建议需要迁移的表拥有主键。 无主键的表在源数据中执行alter table xx replica identity full语句。 前提条件 已创建 PolonDB 集群,且集群状态为活跃。 已创建数据库用户和创建数据库。