标签云
asm 恢复 asm恢复 bbed bootstrap$ dul In Memory kcbzib_kcrsds_1 kccpb_sanity_check_2 kfed MySQL恢复 ORA-00312 ORA-00607 ORA-00704 ORA-01110 ORA-01555 ORA-01578 ORA-08103 ORA-600 2662 ORA-600 2663 ORA-600 3020 ORA-600 4000 ORA-600 4137 ORA-600 4193 ORA-600 4194 ORA-600 16703 ORA-600 kcbzib_kcrsds_1 ORA-600 KCLCHKBLK_4 ORA-15042 ORA-15196 ORACLE 12C oracle dul ORACLE PATCH Oracle Recovery Tools oracle加密恢复 oracle勒索 oracle勒索恢复 oracle异常恢复 ORACLE恢复 Oracle 恢复 ORACLE数据库恢复 oracle 比特币 OSD-04016 YOUR FILES ARE ENCRYPTED 勒索恢复 比特币加密文章分类
- Others (2)
- 中间件 (2)
- WebLogic (2)
- 操作系统 (100)
- 数据库 (1,598)
- DB2 (22)
- MySQL (70)
- Oracle (1,463)
- Data Guard (49)
- EXADATA (7)
- GoldenGate (21)
- ORA-xxxxx (158)
- ORACLE 12C (72)
- ORACLE 18C (6)
- ORACLE 19C (13)
- ORACLE 21C (3)
- Oracle ASM (65)
- Oracle Bug (7)
- Oracle RAC (47)
- Oracle 安全 (6)
- Oracle 开发 (27)
- Oracle 监听 (27)
- Oracle备份恢复 (530)
- Oracle安装升级 (84)
- Oracle性能优化 (62)
- 专题索引 (5)
- 勒索恢复 (75)
- PostgreSQL (18)
- PostgreSQL恢复 (6)
- SQL Server (27)
- SQL Server恢复 (8)
- TimesTen (7)
- 达梦数据库 (2)
- 生活娱乐 (2)
- 至理名言 (11)
- 虚拟化 (2)
- VMware (2)
- 软件开发 (36)
- Asp.Net (9)
- JavaScript (12)
- PHP (2)
- 小工具 (19)
-
最近发表
- PostgreSQL解析wal日志之—walminer
- Oracle 19c/21c最新patch信息-202404
- PostgreSQL恢复系列:pg_filedump批量处理
- PostgreSQL部分主要字典信息
- PostgreSQL恢复系列:pg_filedump恢复字典构造
- PostgreSQL 16 源码安装
- ORA-00742 ORA-00312 恢复
- 数据库open成功后报ORA-00353 ORA-00354错误引起的一系列问题(本质ntfs文件系统异常)
- ORA-600 ktsiseginfo1故障
- ORA-00600: internal error code, arguments: [16703], [1403], [4] 原因
- 最近遇到几起ORA-600 16703故障(tab$被清空),请引起重视
- ORA-600 2662快速恢复之Patch scn工具
- TNS-12518: TNS:listener could not hand off client connection
- ora.storage无法启动报ORA-12514故障处理
- 断电引起文件scn异常数据库恢复
- ORA-16188: LOG_ARCHIVE_CONFIG settings inconsistent with previously started instance
- .[hudsonL@cock.li].mkp勒索加密数据库完美恢复
- 模拟带库实现rman远程备份
- 又一例:ORA-600 kclchkblk_4和2662故障
- Oracle误删除数据文件恢复
标签归档:cursor: pin S wait on X
cursor: pin S wait on X 等待事件
cursor: pin S整体描述
cursor: pin S A session waits on this event when it wants to update a shared mutex pin and another session is currently in the process of updating a shared mutex pin for the same cursor object. This wait event should rarely be seen because a shared mutex pin update is very fast.(Wait Time: Microseconds) --Parameter说明 P1 Hash value of cursor P2 Mutex value 64 bit platforms 8 bytes are used. Top 4 bytes hold the session id (if the mutex is held X) Bottom 4 bytes hold the ref count (if the mutex is held S). 32 bit platforms 4 bytes are used. Top 2 bytes hold the session id (if the mutex is held X) Bottom 2 bytes hold the ref count (if the mutex is held S). P3 Mutex where (an internal code locator) OR'd with Mutex Sleeps --查询sql SELECT a.*, s.sql_text FROM v$sql s, (SELECT sid, event, wait_class, p1 cursor_hash_value, p2raw Mutex_value, TO_NUMBER (SUBSTR (p2raw, 1, 8), 'xxxxxxxx') hold_mutex_x_sid FROM v$session_wait WHERE event LIKE 'cursor%') a WHERE s.HASH_VALUE = a.cursor_hash_value
cursor: pin S wait on X描述
- In previous versions of Oracle, library cache pin is protected by “library cache pin latch”. - But in recent versions of Oracle(I believe it’s 10.2.0.2), library cache pin for the cursor LCO is protected by mutext. - Mutex is allocated per LCO, so it enables fine-grained access control. “cursor: pin S wait on X” wait event is mostly related to mutex and hard parse. - When a process hard parses the SQL statement, it should acquire exclusive library cache pin for the corresponding LCO. - This means that the process acquires the mutex in exclusive mode. - Another process which also executes the same query needs to acquire the mutex but it’s being blocked by preceding process. The wait event is “cursor: pin S wait on X”. --发生cursor: pin S wait on X原因 Frequent Hard Parses If the frequency of Hard Parsing is extremely high, then contention can occur on this pin. High Version Counts When Version counts become excessive, a long chain of versions needs to be examined and this can lead to contention on this event Known bugs Bug 5907779 - Self deadlock hang on "cursor: pin S wait on X" (typically from DBMS_STATS) [ID 5907779.8] Bug 7568642: BLOCKING_SESSION EMPTY FOR "CURSOR: PIN S WAIT ON X"