如果要不产生 REDO 来提高 insert into 的性能,就要下面那样做: alter table B nologging; insert /* +APPEND */ into B(c1,c2) values(x,xx); insert /* +APPEND */ into B select * from A@dblink where ...; 好啦,前面简述了 Oracle 中数据导入导出的各种方法,一定还有更高明的。下面重点讲讲 ...
OPTIONS (skip=1,rows=128)-- sqlldr 命令显示的选项可以写到这里边来,skip=1用来跳过数据中的第一行LOAD DATAINFILE"users_data.csv"--指定外部数据文件,可以是不同格式的数据文件,如csv、txt都支持可以写 多个INFILE"another_data_file.csv"指定多个数据文件truncate--操作类型,用 truncate table 来清除表中原...
型の名前をxsql_table_of_varchar以外に変更することはできませんが、VARCHAR2文字列の次元は必要に応じて変更できます。配列値文字列のパラメータを扱う文字列値と同じ長さにする必要があります。 例25-6のPL/SQLファンクションについて考えてみます。 例25-7のXSQLページに、testTableFunct...
INFILE "users_data.csv" --指定外部数据文件,可以写多个 INFILE "another_data_file.csv" 指定多个数据文件 // INFILE 'tt.date' // 导入多个文件 --这里还可以使用 BADFILE、DISCARDFILE 来指定坏数据和丢弃数据的文件, truncate --操作类型,用 truncate table 来清除表中原有记录 INTO TABLE users -- 要...
history_table_name [, DATA_CONSISTENCY_CHECK = { ON | OFF } ] ) ] } Arguments database_name The name of the database in which the table is created. database_name must specify the name of an existing database. If not specified, database_name defaults to the current database. The...
Another alternative is to create one control file for each table to be loaded and load the tables separately. In that case, SQL*Loader can use the access parameter list LOAD WHEN syntax to specify the range of bytes using POSITION syntax for a single table. SQL*Loader-00821: switching to...
APPEND If table-name identifies a materialized query table, alterations are limited to the following clauses: AUDIT DATA CAPTURE ALTER MATERIALIZED QUERY ALTER PARTITION DROP MATERIALIZED QUERY ADD RESTRICT ON DROP DROP RESTRICT ON DROP ROTATE PARTITION KEY LABEL NO KEY LABEL FL 502 KEY LABEL key...
You can use the following custom SQL query to append the second table, December, to the first table, November: SELECT * FROM November UNION ALL SELECT * FROM December The result of the query looks like this in the data grid: For more information about the union option, see Union Your Da...
cause the descendent table to be delete-connected to its ancestor table through multiple relationships where at least one of the relationships is specified with a delete rule of SET NULL and its foreign key definition overlaps with either the partitioning key, or a dimension of an MDC table. ...
You can use action queries to append, delete, and update records and to save a query's result set as a new table. You can use data-definition queries to create, alter, and delete tables, and to create and delete indexes. You can use theRunSQLmacro action to perform these operations di...