Updating nextval in sequence in oracle Absolutely free webcam video cam dating sites no credit card required

Similar to examining the performance of a sequence in the previous section, the performance of the sequence using the order clause can be easily determined.To do this, the sequence is dropped and then recreated./* Using the same PL/SQL block to translate a ROWID into file# and block# value, we find that all of the sequences reside within a small number of blocks.So, any sequence needing to be refreshed from a less-busy RAC instance is going to wait for one of these blocks because the more-busy RAC node will be dominating access to that block.Instance 2 has sequence values 21 through 40 in its cache.Normally, concurrent sessions might generate sequence values in this order: 1, 2, 21, 3, 22, 4, 23, and 24.

NEXTVAL FROM dual; CACHE Size Demo The default sequence cache in Oracle is 20 which is a ridiculous value. The demo at right shows one aspect of the contention created through accepting this default.The PL/SQL block took about 19 minutes to complete in the first instance.The same block took almost the same identical time to complete in the second instance.Yet some applications need the sequences to denote time ordering, i.e.a sequence value of 11 occurred some time prior to the record with the sequence value of 12.

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