Alter table emp cache;and
Alter table emp storage (buffer_pool Keep);
The ALTER TABLE EMP CACHE puts the table in the general buffer cache, but tries to keep the table in the Most Recently Used end of the LRU list. Hopefully, this keeps the table in the cache longer. But nothing will prevent the table from being aged out the cache should system demands require it.
The second command places the table in a special section of the cache called the KEEP buffer pool. Objects in the KEEP cache hopefully won't get aged out since you've ideally sized this cache to hold your objects.
These two commands are different because they place the table in different portions of the buffer cache.
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This was first published in March 2002