最近被ASM折腾的够呛。昨天碰到一客户，数据库使用的是WIN2008+RAC+ASM。由于EMC存储问题，导致ASM实例出问题，读不出数据，进而导致RAC出问题。折腾了２个小时，终于将ASM实例启动，将RAC转换成单节点。可悲的是，ASM磁盘组读取错误：select 表格出错，exp、expdp出错，rman拷贝出错。赶到客户现场，继续折腾，终于修复错误。回来的路上一直在思考一个问题，在ASM环境下，怎么做数据库的冷备？ 一是Oracle提供了文件传输包DBMS_FILE_TRANSFER，用于传输ASM文件至文件系统中。简要步骤如下 1、同一主机下面建另一实例，用于运行DBMS_FILE_TRANSFER 2、在该实例上运行DBMS_FILE_TRANSFER,拷贝数据文件，控制文件，日志文件 引用 CREATE DIRECTORY source_dir AS "+DATADG/ORADATA"; CREATE DIRECTORY dest_dir AS "/tmp"; BEGIN DBMS_FILE_TRANSFER.COPY_FILE（ source_directory_object => "source_dir", source_file_name => "user01.dbf", destination_directory_object => "dest_dir", destination_file_name => "user01.dbf"）; END; /二是使用ASM提供的ftp特性 1、同一主机下面建另一实例，用于传输ftp 2、用ftp传输相关文件 附：DBMS_FILE_TRANSFER使用限制 # The user must have read privilege on the source directory object and write privilege on the destination directory object. # The procedure converts directory object names to uppercase unless they are surrounded by double quotes. # Files to be copied must be multiples of 512 bytes in size. # Files to be copied must be equal to or less than 2 terabytes in size. # File transfers are not transactional. # Files are copied as binary, so no character conversions are performed. # File copies can be monitored using the V$SESSION_LONGOPS view 在Oracle中手工对任务进行分区的方法MySQL中创建Oracle学习用表相关资讯 oracle
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