上节我们讲了如何安装paramiko，这节我们讲如何使用paramiko连接服务器
从今天开始讲解awr报告Top 5 Timed Events部分 今天讲scattered read等待事件 ---- db file scattered read ?...read过长时间(实时) select * from v$session_Wait where event = 'db file scattered read' ?...---- 查看从实例启动以来等待的会话 使用 v$session_event视图来定位哪个会话等待 scattered read过长时间(非实时) 也可使用v$system_event视图查看系统整体的等待事件...SELECT sid, total_waits, time_waited FROM v$session_event WHERE event='db file scattered read'...注意由于SID是可以复用的，这样查出来的有可能有问题 比如查看SID为587的会话对应的语句也有可能是上个SQL语句导致的scattered read等待，这点需要注意 ---- 查看高物理读的数据文件
通常情况下，我们看到top events中的等待事件db file scattered read时会考虑到增加该参数的值。...但是否增加了DB_FILE_MULTIBLOCK_READ_COUNT的值就一定可以减少db file scattered read?...read' ela= 5148 file#=5 block#=18443 blocks=2 obj#=52884 tim=1337624822005413 WAIT #7: nam='db file scattered...read' ela= 345 file#=5 block#=18603 blocks=16 obj#=52884 tim=1337624822045165 WAIT #7: nam='db file scattered...--由此可知，单纯增加MBRC的值也不能够彻底地解决db file scattered read。 --到底如何设置多少，还是按照Oracle的建议保留缺省值。再在缺省值的基础之上作相应调整。
read' ela= 18267 p1=10 p2=10 p3=128 WAIT #26: nam='db file scattered read' ela= 8836 p1=10 p2=138 p3...=127 WAIT #26: nam='db file scattered read' ela= 8923 p1=10 p2=265 p3=128 WAIT #26: nam='db file scattered...read' ela= 8853 p1=10 p2=393 p3=128 WAIT #26: nam='db file scattered read' ela= 8985 p1=10 p2=521 p3...=128 WAIT #26: nam='db file scattered read' ela= 8997 p1=10 p2=649 p3=128 WAIT #26: nam='db file scattered...read' ela= 9096 p1=10 p2=777 p3=128 WAIT #26: nam='db file scattered read' ela= 583 p1=10 p2=905 p3=
(gdb) p rte_eth_devices[0] $1 = {rx_pkt_burst = 0x7f26bbead580 , tx_pkt_burst...849 } 850 851 uint16_t 852 eth_em_recv_scattered_pkts(void *rx_queue, struct rte_mbuf **rx_pkts.../computo/sites/manuales/fce12/debugger/cl/commandref/gdb_mode/cmd_set_substitu.ht 设置函数断点eth_em_recv_scattered_pkts...#设置断点函数到dpdk收包函数 (gdb) b eth_em_recv_scattered_pkts Breakpoint 1 at 0x7f26bbead580: file .....#gdb 停留在断点位置 Thread 1 "vpp_main" hit Breakpoint 1, eth_em_recv_scattered_pkts (rx_queue=0xac02777c0,
ReliaQuest在11月22日发表的报告中指出，Scattered Spider——ALPHV/Black Cat勒索软件的下属机构——此次行动彰显了其作为大型企业中的强敌之实力。...报告继续指出：“这类社会工程学策略与Scattered Spider历来的作案手段、技术及程序（TTPs）极为吻合，这些手段旨在窃取目标账户的有效凭证。”...Scattered Spider成了不容小觑的对手 这一次的事件突显了Scattered Spider团伙之规模与实力，他们在极短的时间内就能在不同行业和地域的被侵环境中，展现其利用资源的复杂手段。...报告强调：“Scattered Spider以惊人的策略性和精准度兵分多路，针对特定应用程序发起攻击，充分利用对内部IT系统的了解快速横向移动。”...事实上，若MGM的遭遇为迹象，Scattered Spider的攻击潜力巨大，足以对企业网络安全构成灾难性影响，应受到相应的高度重视。
db file scattered read 17 file# 279 db file scattered read 17...file# 255 db file scattered read 17 file# 243 db file scattered read...17 file# 196 db file scattered read 17 file# 187 db file scattered read...db file scattered read 17 file# 108 db file scattered read 17...17 file# 310 db file scattered read 17 file# 302 db file scattered read
12 #b0bf1a Open (40 to 65 %) 13 #9dc209 Open (15 to 40 %) 15 #77dd77 Sparse (4 to 15 %) 16 #64e986 Scattered...(1 to 4 %) 76 #a0d6b4 Natural Aquatic Vegetated: Woody Scattered (1 to 4 %) Water > 3 months (semi-)...permanent 77 #a0d6b4 Natural Aquatic Vegetated: Woody Scattered (1 to 4 %) Water < 3 months (temporary...(1 to 4 %) 91 #a0d6b4 Natural Aquatic Vegetated: Herbaceous Scattered (1 to 4 %) Water > 3 months (semi...-) permanent 92 #a0d6b4 Natural Aquatic Vegetated: Herbaceous Scattered (1 to 4 %) Water < 3 months (
然而，对于前2个读呼叫，这等待事件是db file scattered read，因为块的数量是超过1的。因此，被缓存的块能导致全表扫描操作来执行比所需更多的读。...注意db file sequential read等待与db file scattered read统计数据上比较的数量。这暗示你不能再假设你将从执行计划上就能看到是哪个瓶颈。...解决对策： 1、应用程序层 需要筛选出主要发生db file scattered read等待的sql语句。...因此这个值高，FTS速度相应也会提升，而且db file scattered read等待也会相应减少。将这个值在全系统级上设定得高，并不太妥当。...将db file scattered read事件的等待次数和等待时间比较后，如果平均等待时间长，缓慢的I/O系统成为原因的可能性高。
Best-case read performance 24: Best-case write performance 25: Best-case read performance into scattered...pages 26: Best-case write performance from scattered pages 27: Single read performance by transfer...transfer size 34: Random write performance by transfer size 35: Large sequential read into scattered...pages 36: Large sequential write from scattered pages 37: Write performance with blocking req
从这段内容中，有几点值得说明， 1. db file scattered read Oracle在执行全表扫描(Full Table Scan，FTS)或全索引扫描(Index Full San)时，为保障性能...每次执行Multi Block I/O，都会等待物理I/O结束，此时等待的，就是db file scattered read事件。...3. file#=10 file#对应的是dba_data_files视图中的字段file_id，根据10046这个trace文件中，“db file scattered read”出现的上下文，可以看出不同的...DML不同之处，就在于这种DDL会有隐式提交，因此执行完成，会自动commit，无法回滚，既然是条DML，就会产生redo，就会占用undo空间，这就能解释，为何执行过程中，出现大量“db file scattered
WAIT #140452597414360: nam='db file scattered read' ela= 2723 file#=12 block#=2 blocks=127 obj#=0 tim...2992 requests=12 interrupt=2 timeout=127 obj#=0 tim=64444331227 WAIT #140452597414360: nam='db file scattered...3640 requests=12 interrupt=129 timeout=128 obj#=0 tim=64444337409 WAIT #140452597414360: nam='db file scattered...WAIT #140452576418240: nam='db file scattered read' ela= 6702 file#=12 block#=130817 blocks=128 obj#=...requests=12 interrupt=130817 timeout=128 obj#=0 tim=96033683562 WAIT #140452576418240: nam='db file scattered
db file scattered read 多块读。...A db file scattered read issues a scattered read to read the data into multiple discontinuous memory...A scattered read is usually a multiblock read....The db file scattered read wait event identifies that a full scan is occurring....Such reads are called scattered read calls, because the blocks are scattered throughout memory.
// ["cat"] "The cat scattered his food all over the roome.".match(/\bcat\b/g); // ["cat", "cat"] "The...cat scattered his food all over the roome.".match(/cat/g); 3.
P.S.关于 IaaS、PaaS、SaaS 的更多信息，见IaaS-PaaS-SaaS 定义 三.结构 拓扑结构上，CDN 分为分散式（Scattered CDN）和整合式（Consolidated CDN...）两种 Scattered CDN ?...在世界各地部署尽可能多的服务器，称为分散式 CDN： Scattered CDNs aim to have as many servers scattered around the world as possible
@staticmethod def backward(ctx, grad_output): scattered_grads = Scatter.apply(ctx.input_gpus..., ctx.input_sizes, ctx.dim, grad_output) if ctx.unsqueezed_scalar: scattered_grads...= tuple(g[0] for g in scattered_grads) return (None, None) + scattered_gradsclass Scatter(Function
---- ------- direct path read 4,232 10,827 52.01 db file scattered...--------------------------------------- 从以上的列表，我们很可能倾向于立即开始查找“direct path read”和“db file scattered...Response Time”组件的百分比： CPU time = 94.52% direct path read = 2.85% db file scattered
'db file scattered read' 这是另一种常见的等待事件。...他产生于Oracle从磁盘读取多个块到Buffer Cache中非连续(" scattered")缓存的时候。这种读一次最大值是 DB_FILE_MULTIBLOCK_READ_COUNT。
System I/O log file sync 19,564 3,795 194 6.8 Commit db file scattered...0.5 log file sync 19,564 10.6 3,795 194 0.8 db file scattered...System I/O log file sync 19,564 3,795 194 6.8 Commit db file scattered...0.5 log file sync 19,564 10.6 3,795 194 0.8 db file scattered
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