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The reason the database suspends user activity is that there is simply no place to record the changes the users are making Oracle is attempting to reuse an online redo log file, but because either the file would be needed to recover the database in the event of a failure (Checkpoint not complete), or the archiver has not yet finished copying it (Archival required), Oracle must wait (and the end users will wait) until the redo log file can safely be reused If you see that your sessions spend a lot of time waiting on a log file switch, log buffer space, or log file switch checkpoint or archival incomplete, you are most likely hitting this You will notice it during prolonged periods of database modifications if your log files are sized incorrectly, or because DBWR and ARCH need to be tuned by the DBA or system administrator.

I frequently see this issue with the starter database that has not been customized The starter database typically sizes the redo logs far too small for any significant amount of work (including the initial database build of the data dictionary itself) As soon as you start loading up the database, you will notice that the first 1,000 rows go fast, and then things start going in spurts: 1,000 go fast, then hang, then go fast, then hang, and so on These are the indications you are hitting this condition There are a couple of things you can do to solve this issue: Make DBWR faster Have your DBA tune DBWR by enabling ASYNC I/O, using DBWR I/O slaves, or using multiple DBWR processes.

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By default, .NET objects are local. This means that ordinary .NET objects aren t accessible from outside the process in which they were created. Without taking extra steps in your code, it isn t possible to pass objects to another process or another machine (a procedure known as marshaling), either by value or by reference.

Look at the I/O on the system and see if one disk or a set of disks is hot and you need to therefore spread the data out The same general advice applies for ARCH as well The pros of this are that you get something for nothing here increased performance without really changing any logic/structures/code There really are no downsides to this approach Add more redo log files This will postpone the Checkpoint not complete in some cases and, after a while, it will postpone the Checkpoint not complete so long that it perhaps doesn t happen (because you gave DBWR enough breathing room to checkpoint) The same applies to the Archival required message The benefit of this approach is the removal of the pauses in your system The downside is it consumes more disk, but the benefit far outweighs any downside here.

Re-create the log files with a larger size This will extend the amount of time between the time you fill the online redo log and the time you need to reuse it The same applies to the Archival required message, if the redo log file usage is bursty If you have a period of massive log generation (nightly loads, batch processes) followed by periods of relative calm, then having larger online redo logs can buy enough time for ARCH to catch up during the calm periods The pros and cons are identical to the preceding approach of adding more files Additionally, it may postpone a checkpoint from happening until later, since checkpoints happen at each log switch (at least), and the log switches will now be further apart Make checkpointing happen more frequently and more continuously.

conclusion of his role through the knives of the assassins None of the roles he played since that day rose to the occasion of another calendar reform, although as a dedicated actor he was becoming increasingly aware of the growing discrepancies in keeping track of time resulting from his own reform In AD 1582, the figure of authority in the parts of the world where the Roman Empire had once flourished was Pope Gregory the XIII It took the pope s decree to advance the calendar forward by ten days to compensate for the seemingly imperceptible discrepancies that were gradually introduced by the Julian calendar over the past 1,600+ years Not everyone present on the stage of 1582 was thrilled about the Gregorian calendar reform.

Use a smaller block buffer cache (not entirely desirable) or various parameter settings such as FAST_START_MTTR_TARGET, LOG_CHECKPOINT_INTERVAL, and LOG_CHECKPOINT_TIMEOUT This will force DBWR to flush dirty blocks more frequently The benefit to this approach is that recovery time from a failure is reduced There will always be less work in the online redo logs to be applied The downside is that blocks may be written to disk more frequently if they are modified often The buffer cache will.

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