Oracle常用的维护命令
extent management 有两种方式：extent management local（本地管理），extent management dictionary（数据字典管理），默认的是local
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| SQL> create tablespace bwcx datafile '/data/oracle/oradata/orcl/bwcx1.dbf' size 1G autoextend on next 256M;
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扩展表空间 后期使用
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| SQL> alter tablespace bwcx add datafile '/data/oracle/oradata/orcl/bwcx2.dbf' size 1G autoextend on next 256M;
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创建临时表空间
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| SQL> create temporary tablespace bwcx_t tempfile '/data/oracle/oradata/orcl/bwcx_t1.dbf' size 1G autoextend on next 256M;
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| SQL> select * from dba_tablespaces;
SQL> select * from user_tablespaces;
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| SQL> drop tablespace bwcx_d including datafiles;
SQL> drop tablespace bwcx_d including contents and datafiles;
SQL> drop tablespace bwcx_d including contents and datafiles cascade constraint;
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including contents #删除表空间及对象；
including contents and datafiles #删除表空间、对象及数据文件；
including contents cascade constraint #删除关联；
including contents and datafiles cascade constraint #含前两项。
删除临时表空间
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| SQL> drop tablespace bwcx_t including contents and datafiles;
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连接
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| SQL> conn bwcx_user/bwcx_user;
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查询用户使用的表空间及临时表空间
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| SQL> select username,default_tablespace,temporary_tablespace from dba_users;
SQL> select username,default_tablespace,temporary_tablespace from user_users;
SQL> select username,default_tablespace,temporary_tablespace from dba_users where username='TEST_USER';
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查询临时表空间数据文件路径
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| SQL> select tablespace_name,file_name from dba_temp_files;
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查询表空间数据文件路径
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| SQL> select tablespace_name,file_name,bytes from dba_data_files;
SQL> select tablespace_name,file_name,bytes from dba_data_files where tablespace_name ='BWCX_D';
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| SQL> create user 用户名 identified by "密码" default tablespace 表空间 temporary tablespace 临时表空间;
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| SQL> alter user TEST_USER identified by "newpassword";
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带特殊字符时，如果出现提示enter value for xxx
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| SQL> set define off
SQL> alter user TEST_USER identified by "newpassword";
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| SQL> drop user 用户名 cascade;
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修改用户默认表空间
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| SQL> alter user test default tablespace test1;
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修改用户临时表空间
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| SQL> alter user test temporary tablespace test_t1;
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参考：GRANT
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| select * from dba_roles;
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常用角色就三个：
CONNECTRESOURCEDBA
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| select * from DBA_SYS_PRIVS where GRANTEE='RESOURCE';
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| SQL> grant connect,resource to 用户名;
SQL> grant unlimited tablespace to 用户名;
SQL> grant create view to 用户名;
SQL> grant create job to 用户名;
SQL> grant create public database link to 用户名;
SQL> grant create session to 用户名;
SQL> grant select on 表名 to 用户名;
SQL> grant insert on 表名 to 用户名;
SQL> grant update on 表名 to 用户名;
SQL> grant select,insert,update,delete,all on 表名 to 用户名;
# 所有表查询（dba权限执行）
SQL> grant select any table to reader;
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| SQL> revoke connect from reader;
SQL> revoke select on wcpt_pt_pay_pre from reader;
SQL> revoke select any table from reader;
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查询用户拥有的角色
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| select * from user_role_privs;
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查询用户拥有的权限
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| select * from user_sys_privs;
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赋予权限
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| grant 权限 to user_name;
grant 角色 to user_name;
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撤回权限
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| revoke 权限 from user_name;
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创建角色
给权限赋予权限
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| grant create session to role_name;
grant select, insert, delete, update to role_name;
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查询角色拥有的权限
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| select * from dba_sys_privs where grantee='resource';
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| SQL> alter profile default limit password_life_time unlimited;
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查询directory
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| SQL> select * from dba_directories;
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创建directory
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| SQL> create directory bwcxbak as '/databak/bwcxdata/dmp/';
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删除directory
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| SQL> drop directory bwcxbak;
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授权默认directory(使用Oracle默认的directory)
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| SQL> grant read, write on directory DATA_PUMP_DIR to bwcx_user;
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授权directory给用户访问
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| SQL> grant read, write on directory bwcxbak to bwcx_user;
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根据表查询约束
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| select * from user_constraints where table_name='TEST';
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根据约束查询表
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| select * from all_constraints where constraint_name='SYS_C001011964'
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删除约束
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| ALTER TABLE TEST DROP CONSTRAINT SYS_C0014147;
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EXCLUDE与INCLUDE规则相同，使用方法一致
过滤所有的SEQUENCE,VIEW
过滤单个表对象
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| EXCLUDE=TABLE:"= 'EMP'"
转义后
EXCLUDE=TABLE:\"= \'EMP\'\"
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过滤多个表对象，需要转义才能执行成功
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| EXCLUDE=TABLE:"IN('SYSTEM_LOG','SYSTEM_BUS_LOG')
转义后
EXCLUDE=TABLE:\"IN\(\'SYSTEM_LOG\',\'SYSTEM_BUS_LOG\'\)\"
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模糊匹配
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| EXCLUDE=TABLE:"LIKE 'TMS%'"
转义后
EXCLUDE=TABLE:\"LIKE\ \'TMS%\'\"
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过滤所有的SEQUENCE,VIEW以及表对象EMP,DEPT
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| EXCLUDE=SEQUENCE,VIEW,TABLE:"IN ('EMP','DEPT')"
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过滤指定的索引对象INDX_NAME
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| EXCLUDE=INDEX:"= 'INDX_NAME'"
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通过query过滤指定表数据
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| query=TMS_ORDER_SHIP:'" where 1=2"',TMS_TRANS_SHIP_ROUTE:'" where 1=2"',TMS_ORDER_SHIP_FEE:'" where 1=2"',TMS_ASSET_DRIVER:'" where 1=2"',TMS_FULL_PROCESS_IMPORT2:'" where 1=2"'
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复杂过滤
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| EXCLUDE=TABLE:\"LIKE\ \'\%LOG\'\",STATISTICS,GRANT,PROCEDURE,PACKAGE,VIEW,CONSTRAINT,TRIGGER,PROCOBJ
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| EXCLUDE=TABLE:\"IN\(\'SYSTEM_LOG\',\'SYSTEM_BUS_LOG\'\)\" EXCLUDE=TABLE:\"LIKE\ \'TMS%\'\"
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使用expdp备份时，建议exclude掉自己不需要备份的东西
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| exclude=USER,GRANT,SYSTEM_GRANT,ROLE_GRANT,DEFAULT_ROLE,TABLE_QUOTA,PASSWORD_HISTORY
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示例
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| expdp ${user}/${passwd} \
DIRECTORY=DATA_PUMP_DIR \
SCHEMAS=${user} \
EXCLUDE=statistics \
filesize=2048M \
parallel=4 \
dumpfile=bak_${date}_%U.dmp \
compression=all
参数说明：
filesize # 单个DUMP文件的最大容量
parallel # 并行度
dumpfile # 如使用变量 %U ，impdp时也需使用此变量
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| impdp ${dbuser}/${dbpasswd} DIRECTORY=DATA_PUMP_DIR dumpfile=${filename} remap_tablespace=bwcx:bwcx1 remap_schema=bwcx_user:bwcx_user1 exclude=statistics table_exists_action=replace transform=segment_attributes:n
参数说明：
remap_tablespace #将表空间对象重新映射到另一个表空间
remap_schema #将一个用户的的数据迁移到另外一个用户
exclude=statistics #排除统计值
table_exists_action=replace #删除已存在表，重新建表并追加数据
transform=segment_attributes:n #TRANSFORM适用场景，导入和导出的时候，有些表空间不一样。segment_attributes Y：默认值，表示这个段的属性(物理属性，存储属性，表空间和logging)都将被包含在DDL的语句中。N:表示导入该对象的时候，不会指定表空间等属性，只是简单的创建一个对象。
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导入指定表
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| impdp ${dbuser}/${dbpasswd} directory=DATA_PUMP_DIR dumpfile=expdp.dmp tables=bwcx_user.table1,bwcx_user.table2 remap_schema=bwcx_user:bwcx_user1 table_exists_action=replace transform=segment_attributes:n
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offline（关闭）表空间
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| SQL> alter tablespace bwcx_d offline;
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online（打开）表空间
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| SQL> alter tablespace bwcx_d online;
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Oracle表数据从快照区恢复
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| SQL> select * from abc as of timestamp to_timestamp('2020-01-14 19:00:00','yyyy-mm-dd hh24:mi:ss');
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输出每页行数，缺省为24,为了避免分页，可设定为0。
输出一行字符个数，缺省为80