You have an Oracle Form in which you have multiple data blocks and requirement is to commit just one data block changes and not to effect any other data blocks. But suppose you have a commit_form button also in form which will commit all the data blo…

Suppose you want to give the data backup option in Oracle Forms application to some client users, where you have installed Oracle 11g client or direct from server.The following procedure executes a batch file placed in current working directory of th…

The example given below for writing text file or CSV using Text_IO package from a tabular block in Oracle Forms.   Suppose there is a tabular grid data block "Job_History" in your forms and you want to write a CSV on click of a button by reading…

Suppose you want to populate a non-database data block with records manually in Oracle forms. This task can be done using a cursor.   Below is the example given for hr.job_history table, where user input the employee id in upper block and click on th…

好吧,先说说造成崩溃的原因: 使用redhat 5.9 Linux 作为数据库服务器, 周五数据库正在使用中,硬关机造成数据库文件部分损坏(周一上班时,应用程序启动不起来,查看日志文件时,发现一个数据表映射失败) 使用pl/sql 查询数据文件时,发现 查询表正常,但是使用 where限制条件的时候,会造成崩溃      (只是为了说明命令,未保留当时警告截图) 然后出现 ORA-01578 data block corrupted , 因此 问题排查为当前数据表索引存在问题, 因此使用备份数据…

The database can use table compression to eliminate duplicate values in a data block. This section describes the format of data blocks that use compression. The format of a data block that uses basic and advanced row compression is essentially the sa…

Overview of Data Blocks Oracle Database manages the logical storage space in the data files of a database in units called data blocks, also called Oracle blocks or pages. A data block is the minimum unit of database I/O. Data Blocks and Operating Sys…

环境:hadoop-3.0.2 + 11 机集群 + RS-6-3-1024K 的EC策略 状况:某天,往 HDFS 上日常 put 业务数据时,发现传输速率严重下降 分析: 检查集群发现,在之前的传输中,发生过个别 datanode 临时不可用的状况. 而由于 hadoop EC 机制,当失效 datanode 小于容忍值 (这里是3),put 等传输任务仍然成功.但 hadoop 当时会报错,用于提示程序员,这个报错不会影响当此传输任务,故 put 等传输请求会返回成功.然后,缺失的 dat…

BW数据库后台报错如下:F:\oracle\SBP\saptrace\diag\rdbms\sbp\sbp\trace ORA-01578: ORACLE data block corrupted (file # 29, block # 2889087)ORA-01110: data file 29: 'G:\ORACLE\SBP\SAPDATA2\SR3_18\SR3.DATA18'ORA-26040: Data block was loaded using the NOLOGGING opt…

我们知道通过设置nologging选项.能够加快oracle的某些操作的运行速度,这在运行某些维护任务时是非常实用的,可是该选项也非常危急,假设使用不当,就可能导致数据库发生ORA-26040错误. 首先.构造使用环境. SQL> select tablespace_name,logging,force_logging from dba_tablespaces; TABLESPACE_NAME LOGGING FOR ------------------------------ --------…