GRANTCONNECTONDATABASE your_database_nameTOreadonly_user; (4)设置访问 schema 的权限 如果数据库中有多个模式,并且你只想让用户访问其中一个或几个模式,你可能还需要授予用户对这些 schema 的USAGE权限。 GRANTUSAGEONSCHEMA publicTOreadonly_user; 如果要对多个 schem
PostgreSql is an open source row-oriented and most widely used relational database management system which does not have facility for storing data in column-oriented fashion. In our work we propose the best method for implementing column-store on top of rowstore in PostgreSql along with successful...
AccessprivilegesSchema|Name|Type|Accessprivileges|Columnprivileges|Policies---+---+---+---+---+---ota_data|tb1|table|edbstore=arwdDxt/edbstore+|||readonly=r/edbstore||ota_data|tb2|table|||(2rows) readonly用户再次查看 edbstore=>\d ListofrelationsSchema|Name|Type|Owner---+---+---...
PostgreSQL Basic PG中的MVCC(多版本并发)设计目的是读不阻塞写。...PG中追踪每个表的Block可见性是通过表的vm文件。...PostgreSQL膨胀 膨胀在PG中表示表或者索引的大小大于实际数据的大小,其次表中每个block或者page的空间利用率低。..._5.x86_64 #1 SMP...
[ OWNED BY { table.column | NONE } ] ALTER SEQUENCE name OWNER TO new_owner ALTER SEQUENCE name RENAME TO new_name ALTER SEQUENCE name SET SCHEMA new_schema 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 修改序列起始值: alter sequence mny_draw_record_id_seq restart with 7 ...
read committed (1 row) --首先有表及数据: postgres=# \d test Table "public.test" Column | Type | Collation | Nullable | Default ---+---+---+---+--- id | integer | | not null | name | character varying(100) | | | Indexes: "test_pkey" PRIMARY KEY...
passwd'; ---创建可以读写所有表的用户app_user2 -- Grant privileges to users GRANT readonly ...
SET ROLE dev2;ALTER TABLE user_social ADD COLUMN mastodon_handle TEXTNULL; 希望这第一个简单的示例有助于阐明为什么对象所有权在您的 PostgreSQL 模式中如此重要。没有可以授予第二个开发人员允许他们对表进行修改的特权。更改对象是为所有者(或超级用户)保留的固有特权。
TIMESTAMP) @Column(name = "updated_at", nullable = false) @LastModifiedDate private Date updatedAt; 上面的审计实体包含了 createAt、updateAt 两个日期类型字段,@CreatedDate、@LastModifiedDate分别对应了各自的语义,还是比较容易理解的。 @Temporal 则用于声明日期类型对应的格式,如TIMESTAMP会对应 yyyy-MM...
Rules starting withunique_require the table to have a single column primary key.unique_phonerequires a numeric primary key. Foreign Keys Foreign keys can make it difficult to sync data. Three options are: Defer constraints (recommended)