Steps: === 1) Execute below query to find the constraint name: 执行下面的查询来找到约束名: SQL> select owner, constraint_name,table_name,index_owner,index_name from dba_constraints where (index_owner,index_name) in (select owner,index_name from dba_indexes where tablespace_name='<tablespace_name...
event order by 3; ---连接数状态: select inst_id,status,count(*) from gv$session where type<>'BACKGROUND' group by inst_id,status order by 1,3; ---查看全表扫: set linesize 200 pagesize 40 column program format a16
column_name- name of the column data_type- type of data data_length- maximum length in bytes Rows One rowrepresents one column with a character datatype Scope of rows:all columns containing character datatypes in the schema Ordered byschema name, table name and position in table ...
您没有指定使用哪个数据库;在Oracle 11 g上，可以查询dictionary视图，该视图包含所有 * 系统视图 * 的...
table_name(column_name[,column_name…]) 语法解析: 1. UNIQUE:指定索引列上的值必须是唯一的。称为唯一索引。 2. index_name:指定索引名。 3. tabl_name:指定要为哪个表创建索引。 4. column_name:指定要对哪个列创建索引。我们也可以对多列创建索引;这种索引 ...
exp system/manager buffer=64000 file=/backup/area.dmp owner=bill tables=area 这样用户 bill 的表 area 就被导出到文件中。 需要注意的参数是 Inctype,这个参数可以取一下三个值: Complete(全备份):把数据库中所有数据对象导出到 dump 文件中,只有具有 Exp_full_database 的用户有使用这个参数的权限。
that object numbers are fixed for these tables due to the rigid nature of sql. bsq. DUL can find the information in the system tablespace, therefor the system tablespace datafile(s) must be included in the control file, if this datafile(s) ...
--blob_to_lo : export BLOB as large objects, can only be used with action SHOW_COLUMN, TABLE and INSERT. --cdc_ready : use current SCN per table to export data and register them into a file named TABLES_SCN.log per default. It can be changed using -C | --cdc_file. --lo_...
TABLE_NAME字段:表示表名称。 COLUMN_NAME字段:表示此表的此字段的名称。 DATA_TYPE字段:表示此表的此字段的类型。 DATA_LENGTH字段:表示此表的此字段的长度。 COLUMN_ID字段:表示此表的此字段的序号,1表示第一个字段,2表示第二个字段,以此类推。 在SQL下输入:select * from ALL_TAB_COLUMNS where TABLE_NAM...
will give column_round a value of 1,234,600. The NUMBER datatype is the only datatype that stores numeric values in Oracle. The ANSI datatypes of DECIMAL, NUMBER, INTEGER, INT, SMALLINT, FLOAT, DOUBLE PRECISION, and REAL are all stored in the NUMBER datatype. The language or product ...