Colleagues in charge of backup reported that the recent backup was slow. We use Veritas for backup. Check whether the database is faulty or the backup software is set up. Use RMAN to back up data directly to the hard disk, 1 GB per minute, but use Veritas to back up data for only 200 MB per minute. Search for information online and find that large_pool_size affects the speed and determines the adjustment. The suggestion is large_pool_size = 16 m + 4 * size of tape buffer. What is the size of tape buffer? My colleague thought it was tape Driver Buffer. He called IBM and answered 64 M. He thought it was impossible for large_pool_size to be so large. On the Oracle website, I finally found the explanation. The original saying is: "The size of single tape buffer is defined
By the RMAN channel parameter blksize. "The default value of blksize is 1 M. Therefore, large_pool_size is 20 m.
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