control file parallel write等待事件 This event occurs when a server process is updating all copies of the controlfile. Controlfile updates occur in the following situations: A checkpoint is reached The session starts a control file transaction (to make sure that the control files are up to date...
control file parallel write该等等待事件为 SYSTEM/IO类,(CKPT专属等待事件) control file parallel等待事件往往是高日志切换的症状。 带有该等待事件的会话表明它已经执行了控制文件事务,例如:日志切换、添加或删除数据文件的操作、一些LOB操作。 CKPT进程按每3秒钟一次将位于重做日志中的检查点写入控制文件,ORACLE在数...
This event occurs when a server process is updating all copies of the controlfile. Controlfile updates occur in the following situations: A checkpoint is reached The session starts a control file transaction (to make sure that the control files are up to date in case the session crashes before...
TEMP FILE#1: External File #201name#9: /u01/app/oracle/oradata/orcl/temp01.dbfcreation size=7552 block size=8192 status=0x1e head=9 tail=9 dup=1tablespace3, index=6 krfil=1 prev_file=0unrecoverable scn:0x0000.0011299e 04/29/2019 16:33:33 ===The status field is different from that...
Additional Information: To find out if your version of Oracle implements the backslash escape character for filenames, see your Oracle operating system-specific documentation. For example, to load a file named "topdir\mydir\mydata", you must specify: ...
NFS: An NFS storage location represents an exported file system directory on a server. The server is not required to be an Enterprise Manager host target. Agent: An Agent storage location is similar to the Oracle Management Services (Oracle Management Service) Agent File System option, but can...
一个性能良好的系统,cpu time应该在top 5的前面,否则说明你的系统大部分时间都用在等待上。 在这里,log file parallel write是相对比较多的等待,占用了7%的CPU时间。 通常,在没有问题的数据库中,CPU time总是列在第一个。 更多的等待事件,参见本报告 的Wait Events一节。
The job can also be found running on the Jobs tab of Oracle Enterprise Manager Grid Control. It goes through a series of steps, such as downloading and caching the patch file, and then stages it to the database, finds the OPatch utility to apply the patch to the database, shuts down ...
In model predictive control (MPC), a process dynamic model is utilized to make predictions of the value of the objective function and constraints throughout a prediction horizon. In one method of solving this problem, the time required to find the optimal values of the decision variables depends...
1.Control file parallel write 当数据库中有多个控制文件的拷贝时,Oracle 需要保证信息同步地写到各个控制文件当中,这是一个并行的物理操作过程,因为称为控制文件并行写,当发生这样的操作时,就会产生control file parallel write等待事件。 控制文件频繁写入的原因很多,比如: ...