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How does the sequence cache size affect Oracle?
The sequence cache size determines how many values Oracle preallocates in memory, in the Shared Pool. By preallocating values, Oracle returns the next unique value from memory providing faster access to the information. Setting a cache size larger then 0 can result in the loss of sequence values if the system is shutdown abruptly.
What happens when the cache size is set to 0?
Setting a cache size larger then 0 can result in the loss of sequence values if the system is shutdown abruptly. When the system fails, the values that were preserved in memory are lost to the sequence. For example, assume a sequence has been created with a cache size of 100.
What to do when outlook is not in cached mode?
It works fine when not in cached mode. If in cached mode the emails do not come in until you close/open outlook but they will come in on say an iPhone device. Control Panel > Mail > Email Accounts > select the account and then Change > untick Use Cached Exchange Mode. Open Outlook, then re-enable caching.
Why are Oracle SEQUENCE values lost after start up?
When the sequence is used after start up, Oracle caches values 101 – 200 in memory, resulting in values 46 – 100 being lost. Additionally, sequence values that have been cached in the Shared Pool can be aged out of memory depending on the activity of the database.
How big should the cache size be for ArcSDE?
There are three sequences used by ArcSDE for Oracle that are frequently accessed and should not have a cache size of 0. These sequences are: The cache size for these can be increased to 1000.
How does hint result _ cache work in Oracle?
When you execute a query with the hint result_cache, Oracle performs the operation just like any other operation but the results are stored in the SQL Result Cache. Subsequent invocations of the same query do not actually go to the table (s) but get the results from the cache.