摘要:
--查询实际的统计信息select num_rows,blocks,empty_blocks,avg_space,avg_row_len,sample_size, last_analyzed from dba_tables where upper(table_name)= upper('T_HS_I... 阅读全文
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http://blog.csdn.net/davidhsing/article/details/64087701、如果需要创建全局 DBLink,则需要先确定用户有创建 dblink 的权限:select * from user_sys_privs where privilege like uppe... 阅读全文
摘要:
常用数据结构的时间复杂度Data StructureAddFindDeleteGetByIndexArray (T[])O(n)O(n)O(n)O(1)Linked list (LinkedList)O(1)O(n)O(n)O(n)Resizable array list (List)O(1)O(n... 阅读全文