一.Memory Dumps 1).Global Area ALTER SESSION SET EVENTS ‘immediate trace name global_area level n’; 1 包含PGA 2 包含SGA 4 包含UGA 8 包含indrect memory 2).Library Cache ALTER SESSION SET EVENTS ‘immediate trace name library_cache level n’; 1 library cache统计信息 2 包含hash table histogram 3 包含object handle 4 包含obj