ora-00054:resource busy and acquire with nowait specified解决方法
分析原因:当某个数据库用户在数据库中插入、更新、删除一个表的数据,或者增加一个表的主键时或者表的索引时,常常会出现ora-00054:resource busy and acquire with nowait specified这样的错误。主要是因...
ocp 043解释 51-90
51. While designing your database, you have created the EMPLOYEES table as an index-organized table (IOT). You want to create a bitmap index on the JOB_ID column to make queries faster.Which...
ocp 043 1-50
1. You need to check the EMP_EAST partition in the EMPLOYEES table for physical corruptions. You also need to verify that the rows belong to the correct partition. Which option could you use...
RMAN备份实验记录
1,rman可连接三种数据库target databaserecovery catalog databaseauxiliary database2,非catalog方式 全备份, 0级增量备份, 1级增量备份3,find / -name rman 用这个命令找一...
利用基于函数的唯一索引,完成条件性唯一约束
最近有一个银行帐号表,工号和银行帐号是否主要字段要加个限定索引,逻辑:一个工号只能有一个主要的(1),可以有多个非主要的(0),如果在这两个字段上加个普通索一性索引,那多个非主要的就也不能插入,...