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Question:A latch is defines as:

a.        A mechanism used by the Oracle optimizer to run user queries in parallel
b.        A mechanism to prevent data files that make up the database from auto-extending
d.        A mechanism used by the background process PMON for cleaning up the caches and freeing up resources the user processes were using
A low-level serialization mechanism to protect shared data structures in the system global area

asked Sep 13, 2013 in MYSQL by anonymous
edited Sep 12, 2013
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