checkpoint vsec

large extent. 34 what is the difference between temporary tablespace and permanent tablespace?A: A temporary tablespace is used for temporary objects such as sorting structures and permanent tablespacesUsed to store the 'true' objects (such as tables and rollback segments) 35. What is the name of the tablespace automatically created when a database is created?Answer: System tablespace. 36. In Oracle databases, there are three types of checkpoints Based on the execution time. First, the databa

DBWn: the Database Block Writer is responsible for the background process of writing dirty blocks to the disk. CKPT: The Checkpoint Process is only the header of the file for updating the data file to assist in creating the Checkpoint Process (DBWn ). LGWR: Log Writer is responsible for refresh and output the content in the SGA to the disk. In fact, these three processes are designed to better accomplish on

the reader to view the number of Wals that the continuous running database has committed the changes to at the same time. the transaction can also be appended to the end of a single Wal File Operation Of course, the append of a transaction to be finally transmitted to the wal file is copied back to the original database. Moving the wal file back to the database is called a "checkpoint" Another method is that the difference between rollback and the Wi

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 verified when the database is started. We know how the database controls the SCN in the file when the consistency is disabled? 1. Close t

This articleArticleThis is the second article in the series, in case you have not read the first article. The address of the previous article is as follows: Transaction logs in SQL Server (I)-physical and logical architecture of transaction logs Introduction Each SQL Server database records the corresponding logs to the log files according to the order of the modified data (insert, update, delete. SQL Server uses the write-Ahead Logging Technology to ensure the atomicity and durability of

process writes dirty cache blocks to data files; C. When a checkpoint LGWR process occurs, it notifies the DBWn process to perform write operations; D. When a tablespace is in the backup mode, offline, or read-only state; E. When the DBWn process times out (Time_out), that is, it is not started in about 3 seconds. Ü role: A. Manage High-Speed buffers to ensure that the server process can always find idle cache blocks to save data blocks read from dat

a single extraction process4, the transmission process and the extraction process needs one by one correspondence;2.3. Splitting steps1. Stop Extract Process2. Stop DataPump ProcessGgsci> INFO Datapump_nameEXTRACTDPEF last Started 2011-01-28 12:34 Status RUNNINGCheckpoint Lag 00:00:00 (updated 00:00:05 ago)Log Read Checkpoint File./dirdat/ef0000102011-01-28 12:47:45.000000 RBA 148645Until the RBA number does not change, can stop3. Stop Replicat Proce

1. Example of a calculator (manually add and write the result to the log file) systemutil. run "C: \ windows \ system32 \ calc.exe", "", "C: \ WINDOWS \ System32", "open" window ("Calculator "). winbutton ("1 "). click window ("Calculator "). winbutton ("+ "). click window ("Calculator "). winbutton ("2 "). click window ("Calculator "). winbutton ("= "). click 'Insert --> output value --> standard output value -->... window ("Calculator "). winedit ("edit "). output

When using Microsoft Exchange Server 2003, you must note the differences between recovery and recovery. Restoration refers to the restoration of databases and log files to the server. Restoration refers to the replay of transaction logs to the recovered database. There are two forms of recovery: Soft Recovery refers to the log replay process when the database is reloaded unexpectedly after it is stopped, or when the transaction log is replayed to the offline backup of the database. The replay p

When using Microsoft Exchange Server 2003, you must note the differences between recovery and recovery. Restoration refers to the restoration of databases and log files to the server. Restoration refers to the replay of transaction logs to the recovered database.There are two forms of recovery:Soft Recovery refers to the log replay process when the database is reloaded unexpectedly after it is stopped, or when the transaction log is replayed to the offline backup of the database.The replay proce

:/u01/11.2.0/grid/crs/install/crsconfig_paramsUser ignored prerequisites during installationFailed to write the checkpoint: ' Rootcrs_stack ' with Status:start. ErrorCode is 256Failed to add (property/value):(' version/' 11.2.0.3.0 ') forCheckpoint:rootcrs_stack. Error Code is 256Failed to write the checkpoint: ' Rootcrs_param ' with Status:start. ErrorCode is 256Failed to write contents of Pfile:/u01/11.2.

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 SCN When a checkpoint

MySQL InnoDB log mechanism in-depth analysishttp://blog.csdn.net/yunhua_lee/article/details/65678691.1.Log CheckpointInnoDB transaction log refers to redo log, which is called log, stored in the log file ib_logfile* inside. InnoDB There is another log of undo logs, but the undo log is stored in the shared tablespace (ibdata* file).Because log and checkpoint are closely related, these two parts are analyzed together.Noun Explanation: LSN, log sequence

().-Consistency issues with logical logsThe consistency of the logical log is very complex, and why does the undo log use logical logging?Since redo log uses physiological logs and MTR, you can guarantee that the redo log will be re-completed upon recovery.Data is consistent. When you do undo, you don't have to think about it.04–checkpointTheoretically, if the MySQL database InnoDB storage engine buffer is large enough, you do not need to persist the data itself. Re-execute all redo logs againY

recovery Command provided by the systemThe specific recovery operation is still completed by the DBMS.Two ProblemsSearching the entire log takes a lot of timeREDO processing: Re-execution wastes a lot of timeCheckpoint Recovery TechnologyAdd a checkpoint record to the log file)Add a file to start againThe recovery subsystem dynamically maintains logs during logon log filesCheckpoint Record Content1. Create a list of all ongoing transactions at the

Windows Server 2016 slowly untied its veil, interested in downloading the latest launched Windows Server 2016 Technology Preview 4 , a subset of the virtual machine's capabilities are already open in virtual machines in Windows 10, one of which is the virtual machine production checkpoint (Production Checkpoint). For the concept of checkpoints, perhaps we are all familiar with this feature that is not alrea

write the "pre-update value" in the log into the database. 3. redo is performed on REDO queue transactions to process forward scanning log files. re-register each REDO transaction to write the "updated value" in the log records to the database.Media fault recovery Recovery steps1. Load the latest backup database copy (the closest to the time when the fault occurred) to restore the database to the consistent state of the Last dump.For database copies of static dump, the database is in a consiste

A. Practical Byzantine fault tolerance 1. What's its checkpoint? We will refer to the States produced by the execution of these requests as checkpoints and we will say that a checkpoint with a proof is a stable checkpoint. when the replication code invokes the make_checkpoint upcall, snfsd gets all the copy-on-write bits and creates a (volatile)