使用Active database duplicate建立dataguard(三)
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spfile string /u01/oracle/product/11.2/db_1/
dbs/spfiletgg.ora
SQL>alter database recover managed standby database cancel;
转为ACTIVEDATAGUARD，可以作为只读库
SQL>alter database open;
SQL>alter database recover managed standby database disconnect;
开启实时应用
alterdatabase recover managed standby database using current logfiledisconnect from session;