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+
+title = "从Oracle到openGauss：字典表DBA\_TABLES到tables对应"
+
+date = "2020-11-19"
+
+tags = ["从Oracle到openGauss：字典表DBA\_TABLES到tables对应"]
+
+archives = "2020-11"
+
+author = "盖国强"
+
+summary = "从Oracle到openGauss：字典表DBA\_TABLES到tables对应"
+
+img = "/zh/post/gaiguoqiang/title/title.png"
+
+times = "14:30"
+
++++
+
+# 从Oracle到openGauss：字典表DBA\_TABLES到tables对应
+
+从Oracle数据库向其他数据库过度时，很多朋友会自然而然的寻找属性都过度方式，例如字典表。
+
+有人问，类似DBA\_TABLES，DBA\_TAB\_COLUMNS的字典，在openGauss中是否存在呢？
+
+```
+SELECT OWNER, TABLE_NAME FROM DBA_TABLES;
+
+SELECT COLUMN_NAME,
+ DATA_TYPE,
+ DATA_LENGTH,
+ COLUMN_ID,
+ DATA_PRECISION,
+ DATA_SCALE
+FROM DBA_TAB_COLUMNS
+```
+
+当然会存在对应关系：
+
+ALL\_TABLES =\> information\_schema.tables
+
+```
+postgres=> \d information_schema.tables
+ View "information_schema.tables"
+ Column | Type | Modifiers
+------------------------------+-----------------------------------+-----------
+ table_catalog | information_schema.sql_identifier |
+ table_schema | information_schema.sql_identifier |
+ table_name | information_schema.sql_identifier |
+ table_type | information_schema.character_data |
+ self_referencing_column_name | information_schema.sql_identifier |
+ reference_generation | information_schema.character_data |
+ user_defined_type_catalog | information_schema.sql_identifier |
+ user_defined_type_schema | information_schema.sql_identifier |
+ user_defined_type_name | information_schema.sql_identifier |
+ is_insertable_into | information_schema.yes_or_no |
+ is_typed | information_schema.yes_or_no |
+ commit_action | information_schema.character_data |
+```
+
+http://www.postgresql.org/docs/current/static/infoschema-tables.html
+
+ALL\_TAB\_COLUMNS =\> information\_schema.columns
+
+```
+postgres=> \d information_schema.columns
+ View "information_schema.columns"
+ Column | Type | Modifiers
+--------------------------+------------------------------------+-----------
+ table_catalog | information_schema.sql_identifier |
+ table_schema | information_schema.sql_identifier |
+ table_name | information_schema.sql_identifier |
+ column_name | information_schema.sql_identifier |
+ ordinal_position | information_schema.cardinal_number |
+ column_default | information_schema.character_data |
+ is_nullable | information_schema.yes_or_no |
+ data_type | information_schema.character_data |
+ character_maximum_length | information_schema.cardinal_number |
+ character_octet_length | information_schema.cardinal_number |
+ numeric_precision | information_schema.cardinal_number |
+ numeric_precision_radix | information_schema.cardinal_number |
+ numeric_scale | information_schema.cardinal_number |
+ datetime_precision | information_schema.cardinal_number |
+ interval_type | information_schema.character_data |
+ interval_precision | information_schema.cardinal_number |
+ character_set_catalog | information_schema.sql_identifier |
+ character_set_schema | information_schema.sql_identifier |
+ character_set_name | information_schema.sql_identifier |
+ collation_catalog | information_schema.sql_identifier |
+ collation_schema | information_schema.sql_identifier |
+ collation_name | information_schema.sql_identifier |
+ domain_catalog | information_schema.sql_identifier |
+ domain_schema | information_schema.sql_identifier |
+ domain_name | information_schema.sql_identifier |
+ udt_catalog | information_schema.sql_identifier |
+ udt_schema | information_schema.sql_identifier |
+ udt_name | information_schema.sql_identifier |
+ scope_catalog | information_schema.sql_identifier |
+ scope_schema | information_schema.sql_identifier |
+ scope_name | information_schema.sql_identifier |
+ maximum_cardinality | information_schema.cardinal_number |
+ dtd_identifier | information_schema.sql_identifier |
+ is_self_referencing | information_schema.yes_or_no |
+ is_identity | information_schema.yes_or_no |
+ identity_generation | information_schema.character_data |
+ identity_start | information_schema.character_data |
+ identity_increment | information_schema.character_data |
+ identity_maximum | information_schema.character_data |
+ identity_minimum | information_schema.character_data |
+ identity_cycle | information_schema.yes_or_no |
+ is_generated | information_schema.character_data |
+ generation_expression | information_schema.character_data |
+ is_updatable | information_schema.yes_or_no |
+```
+
+http://www.postgresql.org/docs/current/static/infoschema-columns.html
+
+供参考。
+
diff --git "a/content/zh/post/gaiguoqiang/\346\226\260\347\224\250\346\210\267\346\235\203\351\231\220\345\222\214permission-denied-for-schema-public.md" "b/content/zh/post/gaiguoqiang/\346\226\260\347\224\250\346\210\267\346\235\203\351\231\220\345\222\214permission-denied-for-schema-public.md"
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+
+title = "新用户权限和permission denied for schema public"
+
+date = "2020-11-19"
+
+tags = ["新用户权限和permission denied for schema public"]
+
+archives = "2020-11"
+
+author = "盖国强"
+
+summary = "新用户权限和permission denied for schema public"
+
+img = "/zh/post/gaiguoqiang/title/title.png"
+
+times = "15:30"
+
++++
+
+# 新用户权限和permission denied for schema public
+
+openGauss 安装完成后，会自动创建自定义的帐号，名称默认为omm。默认用户名omm和操作系统用户同名，我们可以通过**REPLACE**修改其密码。
+
+```
+omm=# alter role omm identified by 'Open6au55' replace 'Gauss@123';
+NOTICE: The encrypted password contains MD5 ciphertext, which is not secure.
+ALTER ROLE
+omm=# alter role omm identified by 'Open6au55' replace 'Gauss@123';
+ERROR: The old password is invalid.
+```
+
+可以使用 omm 登录，创建一个新的用户，我们可以看到 openGauss 对于密码安全的要求：
+
+```
+omm=# create user enmotech with password 'enmotech';
+ERROR: Password must contain at least three kinds of characters.
+omm=#
+omm=# create user enmotech with password 'Enm0t3ch';
+NOTICE: The encrypted password contains MD5 ciphertext, which is not secure.
+CREATE ROLE
+```
+
+创建独立的数据库，给用户授权：
+
+```
+omm=# create database enmotech owner enmotech;
+CREATE DATABASE
+omm=# GRANT ALL PRIVILEGES ON DATABASE enmotech to enmotech;
+GRANT
+omm=# ALTER ROLE enmotech CREATEDB;
+ALTER ROLE
+
+omm=# \q
+```
+
+在操作系统上，连接到容器数据库中：
+
+```
+[root@ecs-514e-0004 ~]# gsql -d enmotech -U enmotech -W'Enm0t3ch' -h 192.168.1.94 -p 8888
+gsql ((openGauss 1.0 build ec0e781b) compiled at 2020-04-27 17:25:57 commit 2144 last mr 131 )
+Non-SSL connection (SSL connection is recommended when requiring high-security)
+Type "help" for help.
+
+enmotech=>
+```
+
+注意，此时创建数据表还是遇到错误，不允许在 public 上创建：
+
+```
+enmotech=> create table yunhe (id number);
+ERROR: permission denied for schema public
+```
+
+类似的建表失败报错可能还累死：
+
+```
+[Err] ERROR: permission denied for schema public
+LINE 1: create table xxxx
+```
+
+这是因为安全原因，不允许普通客户在public模式下操作。
+
+在测试需要下，可以将 ALL PRIVILEGES 授予 enmotech 用户，需要使用超级用户授权，这里是 omm 用户：
+
+```
+omm=# GRANT ALL PRIVILEGES TO enmotech;
+ALTER ROLE
+```
+
+系统权限又称为用户属性，包括SYSADMIN、CREATEDB、CREATEROLE、AUDITADMIN和LOGIN。
+
+```
+omm=# \du
+ List of roles
+ Role name | Attributes | Member of
+-----------+------------------------------------------------------------------------+-----------
+ enmotech | Sysadmin | {}
+ gaussdb | | {}
+ omm | Sysadmin, Create role, Create DB, Replication, Administer audit, UseFT | {}
+```
+
+现在 enmotech 这个用户，可以继续测试了：
+
+```
+eygle=> create table eygle(id number);
+CREATE TABLE
+eygle=> drop table eygle;
+DROP TABLE
+```
+
+在 openGauss 中，通过 sql 文件，加载数据也非常简单：
+
+```
+eygle=> \i /tmp/dan.sql
+INSERT 0 1
+INSERT 0 1
+...
+```