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Oracle Block scn/commit scn/cleanout scn description 1. description: The cache header part of the Block records a block scn, which is the timestamp of the last change of the current Block. To be exact, this update does not refer to the latest update of the scn on the itl, wh

Detailed explanation of System Change number (SCN) and change number scnDetailed description of oracle026 System Change number (SCN) the SCN System Change number is to generate a certain number of time through some functions; ensure the consistency of data files, comparison, old and new;Why use time to generate numbers, because the comparison time is relatively s

1. ORA-600 [2662] Description For ORA-600 [2662] errors, the previous blog has instructions: ORA-600 [2662] "Block SCN is ahead of current SCN" [ID 28929.1] Http://blog.csdn.net/tianlesoftware/article/details/6106130 For a description of the parameters of the ORA-600, refer to my blog: Description of parameters of ORA-600 Http://blog.csdn.net/tianlesoftware/article/details/6645809 Simply put, when the

Database Current SCNCode to copy code as followsIdle> select checkpoint_change# from V$database;checkpoint_change#------------------271743118idle> Shutdown AbortThe ORACLE routine has been closed.Analysis of SCN in control fileHere we can see the bold part for the database SCNCode to copy code as followsSql>select to_number (' 10327a59 ', ' xxxxxxxxx ') from dual;To_number (' 10327a59 ', ' xxxxxxxxx ')---------------------------------271743577There is

Database Current SCN The code is as follows Copy Code Idle> select checkpoint_change# from V$database;checkpoint_change#------------------271743118idle> Shutdown Abort The ORACLE routine has been closed.SCN in Analysis control file Here we can see the bold section for the database SCN The code is as follows Copy Code Sql>select to_n

How to recover from extract error 180 encountered commit SCN that is not greater than the highest SCN already processedThis is the summary of Metalink DOC: 987379.1This error occurs in an Oracle RAC environment after a transaction is written to the idle node but does not yet appear in the redo log when the current transaction is processed. this transaction will have a higher

Mutual conversion of SCN timestamps and mutual conversion of scnSQL> select * from v $ version where rownum = 1;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-ProductionSQL>! Cat/etc/issueEnterprise Linux Server release 5.5 (Carthage)Kernel \ r on an \ mOracle 10g provides two new functions for converting scn an

When using OPENCV to read video for processing, the error is as follows: Gray =cv2.cvtcolor (Frame,cv2. Color_bgr2gray) Cv2.error:.. \.. \.. \opencv-3.1.0\modules\imgproc\src\color.cpp:7456:error: ( -215) SCN ==3 | | SCN = 4 in function Cv::ipp_cvtcolor My original processing of the code did not judge whether the video processing completed, so after adding to the reading of the video frame and read the co

Verification checkpoint SCN during Oracle Database startup SCN (System Change Number) is an important mechanism for Oracle databases. SCN is used when the database is started, read consistency, data recovery, and FLASHBACK operations. 1. the SCN number is an important time mechanism and can be converted between the two

[Note] I was studying backup and recovery, but I was not very familiar with some problems during the experiment. I went back to the root of the source and wanted to figure it out, therefore, you must understand the relationship between SCN and recovery. I have read many articles over the past two days, including the articles on the eygle website and the posts posted or discussed by Masters such as Biti on itpub, I found that my thinking was vague to c

SCN in the control file SCN for data file header SCN in a data block SCN in the log file header Transaction SCN In-memory SCN The SCN in a control file 1.1 Database

About the SCN understanding System Checkpoint SCN (V$database (checkpoint_change#)) Data file Checkpoint (V$datafile (checkpoint_change#)) Data file termination SCN (V$datafile (last_change#)) Checkpoints stored in data files Start SCN (V$datafile_header (checkpoint_change#) 1. System Checkpoint

(From: http://space.itpub.net/12361284/viewspace-346) At the beginning of the year, I read the book deep dive written by eygle, and I felt a lot of GAINS.We can summarize the two topics SCN and checkpoint. CheckpointMany people complicate the checkpoint concept. In fact, the checkpointDatabaseThe real significance of the concept introduction is to reduce the time spent in database recovery (instance recovery). Who will do the checkpoint? We all know t

Oracle SCNSystem Chang Number) is an important mechanism in Oracle, it plays an important role in Data recovery, Data Guard, Streams replication, and related synchronization between RAC nodes. Understanding the operating mechanism of SCN can help you gain a deeper understanding of the above functions. Before understanding Oracle SCN, Let's first look at how data changes in Oracle transactions write data fil

oracle026 System Change Number (SCN) of the detailed SCN system change number, is through some functions to generate a certain number of time, to ensure consistency of data files, compared successively, new and old;Why use time to generate numbers, because the comparison time is slower, and the number is relative to the block point, just like the shared pool comparison of SQLUse the calculated hash value fo

As an important mechanism in Oracle, SCN (system Chang number) plays an important role in data recovery, data guard, streams replication, and synchronization between RAC nodes. Understanding the operating mechanism of SCN can help you gain a deeper understanding of the above functions. Before understanding SCN, Let's first look at how data changes in Oracle tran

file information. Redo logs and archive logs. Backup set and backup file information Check Point and SCN information. When the database is shut down normally, the SCN value in the control file In the data file information section of the control file, each data file has a Checkpoint SCN and Stop SCN, which must be ve

SCN: System Change Number SCN is a logical internal timestamp of the Oracle database, used to identify the version submitted by the database at a specific time. When a transaction is committed or rolled back, it is assigned a unique SCN that identifies the transaction to ensure Database Consistency. SQL> select dbms_flashback.get_system_change_number, SCN_TO_TIME

SCN is the clock that Oracle hangs on the wall. Get up in the morning, say "Get up SCN"; eat breakfast, name "Breakfast SCN"; go to work, called "Go out SCN ". Any of our activities will correspond to an SCN. We can use an internal Oracle package to obtain the system's

SCN: SystemChangeNumberSCN is a logical internal timestamp of the Oracle database, used to identify the version submitted by the database at a specific time. When a transaction is committed or rolled back, it is assigned a unique identifier for the transaction. SCN: SystemChangeNumberSCN is a logical internal timestamp of the Oracle database, used to identify the version submitted by the database at a speci