本文介绍在业务测试过程中,由于BUG导致数据库产生大量gc quiesce等待。 问题现象 其中一套数据库在业务测试过程中,业务反馈入库进程缓慢。 取awr分析,绝大部分的BD time消耗在gc quiesce等待上,平均等待时间1ms。 ? 且等待全部消耗在truncate语句上。 ? gc quiesce不是一个常见的等待事件,通过搜索相关资料,信息比较有限。 下面的说明显示:该等待本身不是问题,只是其他一些问题(如:ORA-600)的副作用。 具体问题是buffer上的锁在关闭时存在不必要的处理,可能造成导致1秒以内的"gc quiesce"等的等待事件。 问题解决 通过打上29908777补丁,经观察gc quiesce等待基本消失。 平均等待时间由原来的1s降为0.08ms,问题解决。 ?
♣ 题目部分 在Oracle中,数据库处于RESTRICT、QUIESCE和SUSPEND状态的区别是什么? ♣ 答案部分 在Oracle中,数据库可以有3种限制性状态,如下表所示: ?
--------------------------------- WARNING : While repository is dropped the database will be put in quiesce this warning will be displayed: WARNING : While repository is dropped the database will be put in quiesce --------------------------------- WARNING : While repository is dropped the database will be put in quiesce
在最近的提交中我看到了这个commit librbd: API for quiesce callbacks 增加了静默的回调,什么意思? * <start>* |* v* STATE_NOTIFY_QUIESCE |* v* <finish> 可以看到增加了notify_quiesce
def alphabeta(alpha, beta, depthleft): bestscore = -9999 if (depthleft == 0): return quiesce 代码如下: def quiesce(alpha, beta): stand_pat = evaluate_board() if (stand_pat >= beta): board.legal_moves: if board.is_capture(move): board.push(move) score = -quiesce return beta if (score > alpha): alpha = score return alpha 简单总结一下 quiesce quiesce 函数流程图。
DBADM,CREATETAB,BINDADD,CONNECT,CREATE_NOT_FENCED_ROUTINE,IMPLICIT_SCHEMA,LOAD,CREATE_EXTERNAL_ROUTINE,QUIESCE_CONNECT DBADM,CREATETAB,BINDADD,CONNECT,CREATE_NOT_FENCED_ROUTINE,IMPLICIT_SCHEMA,LOAD,CREATE_EXTERNAL_ROUTINE,QUIESCE_CONNECT
reuse any existing external files VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT = 32 #use guest agent to quiesce all mounted file systems within the domain VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE = 64 #atomically
运行命令行,并将路径切换到TFS安装路径:C:\Program Files\Microsoft Team Foundation Server 2010\Tools 运行:TFSServiceControl quiesce
procs_priv proxies_priv role_edges default_roles global_grants password_history switch (m_prebuilt->table->quiesce ) { case QUIESCE_START: /* Check for FLUSH TABLE t WITH READ LOCK; */ if (! row_quiesce_table_start(m_prebuilt->table, trx); ... } break; ... } 只有执行 FLUSH TABLES row_quiesce_table_start() 会调用 buf_LRU_flush_or_remove_pages(),并把当前加表锁的表所属表空间对象传给该方法,表示把该表空间的脏页刷新到磁盘。
GET/UPDATE ADMIN CFG QUERY CLIENT UPDATE CONTACTGROUP GET ALERT CFG QUIESCE DATABASE UPDATE NOTIFICATION LIST GET AUTHORIZATIONS QUIESCE INSTANCE UPDATE HISTORY GET/UPDATE CLI CFG QUIESCE TABLESPACES UPDATE LDAP NODE GET CONNECTION STATE
of diskgroup DATA NOTE: cache dismounting (clean) group 2/0x877A96CD (DATA) NOTE: messaging CKPT to quiesce 2018-05-17 21:54:45.017799 : kjb_abort_recovery: domain flags=0x0, valid=0 NOTE: messaging CKPT to quiesce disk 0x9f1d8d88 (2:3:DATA_0003:/dev/asmdisk/oraasm-ASM_0003) is being cleared NOTE: messaging CKPT to quiesce
expect = "HTTP" use_regex = 0 load_monitor = none scheduler = rr protocol = tcp timeout = 6 reentry = 15 quiesce_server
vfu_setup_device_reset_cb(endpoint->vfu_ctx, tgt_device_reset_cb) vfu_setup_device_quiesce_cb (endpoint->vfu_ctx, tgt_device_quiesce_cb) vfu_setup_device_nr_irqs vfu_realize_ctx pre_memory_remove = vfu_virtio_pre_memory_remove, .reset_device = vfu_virtio_pci_reset_cb, .quiesce_device = vfu_virtio_quiesce_cb, .destruct = vfu_virtio_blk_endpoint_destruct, .attach_device = vfu_virtio_attach_device
Delay 120 seconds between each forceMerge operation to allow the cluster to quiesce.
从PCIe卡设备硬件功能的角度来看,其需要支持Quiesce命令、Pause命令(可选)、Start命令和Resume命令。
Delay 120 seconds between each forceMerge operation to allow the cluster to quiesce.
应用有没有quiesce?分布式组件是不是“半写入状态”?说白了:不是你把文件拷走就叫备份。
UNKNOWN'), decode(bitand(ksuxsdst, 1 ), 0, 'NO', 1, 'YES', 'NO') from x$ksuxsinst ks, x$kvit kv, x$quiesce
closeAllOperators(); // make sure no new timers can come timerService.quiesce
show_image_direct_url = True hw_scsi_model=virtio-scsi hw_disk_bus=scsi hw_qemu_guest_agent=yes os_require_quiesce