今天是2014-03-28,继续写RAC的内容,今天写的是如何恢复损坏的表决磁盘(votedisk)和OCR。 首先查看目前状态: [root@rac-two bin]# ./ocrcheckStatus of Oracle Cluster Registry is as follows : Version : 3 Total space (kbytes) : 262120 Used space
今天是2014-03-28,继续写RAC的内容,今天写的是如何恢复损坏的表决磁盘(votedisk)和OCR。
首先查看目前状态:
[root@rac-two bin]# ./ocrcheck Status of Oracle Cluster Registry is as follows : Version : 3 Total space (kbytes) : 262120 Used space (kbytes) : 3472 Available space (kbytes) : 258648 ID : 152256349 Device/File Name : +GIDG Device/File integrity check succeeded Device/File not configured Device/File not configured Device/File not configured Device/File not configured Cluster registry integrity check succeeded Logical corruption check succeeded [root@rac-two bin]# ./crsctl query css votedisk ## STATE File Universal Id File Name Disk group -- ----- ----------------- --------- --------- 1. ONLINE af2fed5d6ac54f1bbf19e4982e364c57 (/dev/asm-diske) [GIDG] 2. ONLINE 34b65f2e3db14f23bf88e689b55058b7 (/dev/asm-diskd) [GIDG] 3. ONLINE 07bf3ce9af7d4ff6bf38d160255c671c (/dev/asm-diskc) [GIDG] Located 3 voting disk(s). [root@rac-two bin]# ./crsctl stat res -t -------------------------------------------------------------------------------- NAME TARGET STATE SERVER STATE_DETAILS -------------------------------------------------------------------------------- Local Resources -------------------------------------------------------------------------------- ora.DATADG.dg ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.GIDG.dg ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.LISTENER.lsnr ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.TESTDG.dg OFFLINE OFFLINE rac-one ONLINE OFFLINE rac-two ora.asm ONLINE ONLINE rac-one Started ONLINE ONLINE rac-two Started ora.gsd OFFLINE OFFLINE rac-one OFFLINE OFFLINE rac-two ora.net1.network ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.ons ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.registry.acfs ONLINE ONLINE rac-one ONLINE ONLINE rac-two -------------------------------------------------------------------------------- Cluster Resources -------------------------------------------------------------------------------- ora.LISTENER_SCAN1.lsnr 1 ONLINE ONLINE rac-two ora.LISTENER_SCAN2.lsnr 1 ONLINE ONLINE rac-one ora.LISTENER_SCAN3.lsnr 1 ONLINE ONLINE rac-one ora.cvu 1 ONLINE ONLINE rac-one ora.oc4j 1 ONLINE ONLINE rac-one ora.rac-one.vip 1 ONLINE ONLINE rac-one ora.rac-two.vip 1 ONLINE ONLINE rac-two ora.rac.db 1 ONLINE ONLINE rac-two Open 2 ONLINE ONLINE rac-one Open ora.scan1.vip 1 ONLINE ONLINE rac-two ora.scan2.vip 1 ONLINE ONLINE rac-one ora.scan3.vip 1 ONLINE ONLINE rac-one
模拟votedisk和ocr损坏。
[root@rac-two bin]# dd if=/dev/zero of=/dev/asm-diske bs=1024 count=200; dd if=/dev/zero of=/dev/asm-diskd bs=1024 count=200; dd if=/dev/zero of=/dev/asm-diskc bs=1024 count=200;200+0 records in 200+0 records out 204800 bytes (205 kB) copied, 0.0884688 s, 2.3 MB/s [root@rac-two bin]# dd if=/dev/zero of=/dev/asm-diskd bs=1024 count=200; 200+0 records in 200+0 records out 204800 bytes (205 kB) copied, 0.138348 s, 1.5 MB/s [root@rac-two bin]# dd if=/dev/zero of=/dev/asm-diskc bs=1024 count=200; 200+0 records in 200+0 records out 204800 bytes (205 kB) copied, 0.103544 s, 2.0 MB/s
开始进行恢复:
停止crs资源。
[root@rac-two bin]# ./crsctl stop crs CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'rac-two' CRS-2673: Attempting to stop 'ora.crsd' on 'rac-two' CRS-2790: Starting shutdown of Cluster Ready Services-managed resources on 'rac-two' CRS-2673: Attempting to stop 'ora.LISTENER.lsnr' on 'rac-two' CRS-2673: Attempting to stop 'ora.LISTENER_SCAN1.lsnr' on 'rac-two' CRS-2673: Attempting to stop 'ora.GIDG.dg' on 'rac-two' CRS-2673: Attempting to stop 'ora.registry.acfs' on 'rac-two' CRS-2673: Attempting to stop 'ora.rac.db' on 'rac-two' CRS-2677: Stop of 'ora.LISTENER.lsnr' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.rac-two.vip' on 'rac-two' CRS-2677: Stop of 'ora.LISTENER_SCAN1.lsnr' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.scan1.vip' on 'rac-two' CRS-2677: Stop of 'ora.rac-two.vip' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.rac-two.vip' on 'rac-one' CRS-2677: Stop of 'ora.registry.acfs' on 'rac-two' succeeded CRS-2677: Stop of 'ora.scan1.vip' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.scan1.vip' on 'rac-one' CRS-2677: Stop of 'ora.rac.db' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.DATADG.dg' on 'rac-two' CRS-2677: Stop of 'ora.DATADG.dg' on 'rac-two' succeeded CRS-2676: Start of 'ora.rac-two.vip' on 'rac-one' succeeded CRS-2676: Start of 'ora.scan1.vip' on 'rac-one' succeeded CRS-2672: Attempting to start 'ora.LISTENER_SCAN1.lsnr' on 'rac-one' CRS-2677: Stop of 'ora.GIDG.dg' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.asm' on 'rac-two' CRS-2677: Stop of 'ora.asm' on 'rac-two' succeeded CRS-2676: Start of 'ora.LISTENER_SCAN1.lsnr' on 'rac-one' succeeded CRS-2673: Attempting to stop 'ora.ons' on 'rac-two' CRS-2677: Stop of 'ora.ons' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.net1.network' on 'rac-two' CRS-2677: Stop of 'ora.net1.network' on 'rac-two' succeeded CRS-2792: Shutdown of Cluster Ready Services-managed resources on 'rac-two' has completed CRS-2677: Stop of 'ora.crsd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.crf' on 'rac-two' CRS-2673: Attempting to stop 'ora.ctssd' on 'rac-two' CRS-2673: Attempting to stop 'ora.evmd' on 'rac-two' CRS-2673: Attempting to stop 'ora.asm' on 'rac-two' CRS-2673: Attempting to stop 'ora.drivers.acfs' on 'rac-two' CRS-2673: Attempting to stop 'ora.mdnsd' on 'rac-two' CRS-2677: Stop of 'ora.crf' on 'rac-two' succeeded CRS-2677: Stop of 'ora.evmd' on 'rac-two' succeeded CRS-2677: Stop of 'ora.mdnsd' on 'rac-two' succeeded CRS-2677: Stop of 'ora.asm' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.cluster_interconnect.haip' on 'rac-two' CRS-2677: Stop of 'ora.ctssd' on 'rac-two' succeeded CRS-2677: Stop of 'ora.cluster_interconnect.haip' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.cssd' on 'rac-two' CRS-2677: Stop of 'ora.drivers.acfs' on 'rac-two' succeeded CRS-2677: Stop of 'ora.cssd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.gipcd' on 'rac-two' CRS-2677: Stop of 'ora.gipcd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.gpnpd' on 'rac-two' CRS-2677: Stop of 'ora.gpnpd' on 'rac-two' succeeded CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'rac-two' has completed CRS-4133: Oracle High Availability Services has been stopped.
启动到独占模式且不启动ora.crsd:
[root@rac-two bin]# ./crsctl start crs -excl -nocrs CRS-4123: Oracle High Availability Services has been started. CRS-2672: Attempting to start 'ora.mdnsd' on 'rac-two' CRS-2676: Start of 'ora.mdnsd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.gpnpd' on 'rac-two' CRS-2676: Start of 'ora.gpnpd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.cssdmonitor' on 'rac-two' CRS-2672: Attempting to start 'ora.gipcd' on 'rac-two' CRS-2676: Start of 'ora.cssdmonitor' on 'rac-two' succeeded CRS-2676: Start of 'ora.gipcd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.cssd' on 'rac-two' CRS-2672: Attempting to start 'ora.diskmon' on 'rac-two' CRS-2676: Start of 'ora.diskmon' on 'rac-two' succeeded CRS-2676: Start of 'ora.cssd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.drivers.acfs' on 'rac-two' CRS-2679: Attempting to clean 'ora.cluster_interconnect.haip' on 'rac-two' CRS-2672: Attempting to start 'ora.ctssd' on 'rac-two' CRS-2681: Clean of 'ora.cluster_interconnect.haip' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.cluster_interconnect.haip' on 'rac-two' CRS-2676: Start of 'ora.drivers.acfs' on 'rac-two' succeeded CRS-2676: Start of 'ora.ctssd' on 'rac-two' succeeded CRS-2676: Start of 'ora.cluster_interconnect.haip' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.asm' on 'rac-two' CRS-2676: Start of 'ora.asm' on 'rac-two' succeeded
创建磁盘组:
[root@rac-two bin]# su - grid [grid@rac-two ~]$ sqlplus / as sysasm SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 28 00:01:05 2014 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Real Application Clusters and Automatic Storage Management options SQL> create diskgroup gidg normal redundancy 2 disk '/dev/asm-diske','/dev/asm-diskd','/dev/asm-diskc' attribute 'au_size'='1M','compatible.asm'='11.2','compatible.rdbms'='11.2','compatible.advm'='11.2'; Diskgroup created. SQL> select name,state from v$asm_diskgroup; NAME STATE ------------------------------ ----------- DATADG DISMOUNTED TESTDG DISMOUNTED GIDG MOUNTED SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Real Application Clusters and Automatic Storage Management options [grid@rac-two ~]$ exit
首先要恢复的是ocr
[root@rac-two bin]# ./ocrconfig -restore /u01/app/11.2.0/grid/cdata/rac-two-cluster/backup00.ocr [root@rac-two bin]# ./ocrcheck Status of Oracle Cluster Registry is as follows : Version : 3 Total space (kbytes) : 262120 Used space (kbytes) : 3472 Available space (kbytes) : 258648 ID : 152256349 Device/File Name : +GIDG Device/File integrity check succeeded Device/File not configured Device/File not configured Device/File not configured Device/File not configured Cluster registry integrity check succeeded Logical corruption check succeeded
恢复votedisk:
[root@rac-two bin]# ./crsctl query css votedisk Located 0 voting disk(s). [root@rac-two bin]# ./crsctl replace votedisk +GIDG CRS-4602: Failed 27 to add voting file 58c5df27b4884f70bfb38fc4c93b8f72. CRS-4602: Failed 27 to add voting file 51caa3f834964f5abf6efcfb90476d85. CRS-4602: Failed 27 to add voting file 92b70ca3ea5d4f80bf9df66a8e975ba9. Failed to replace voting disk group with +GIDG. CRS-4000: Command Replace failed, or completed with errors.
提示失败,需要重启crs资源。
[root@rac-two bin]# ./crsctl stop crs CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'rac-two' CRS-2673: Attempting to stop 'ora.ctssd' on 'rac-two' CRS-2673: Attempting to stop 'ora.asm' on 'rac-two' CRS-2673: Attempting to stop 'ora.drivers.acfs' on 'rac-two' CRS-2673: Attempting to stop 'ora.mdnsd' on 'rac-two' CRS-2677: Stop of 'ora.mdnsd' on 'rac-two' succeeded CRS-2677: Stop of 'ora.asm' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.cluster_interconnect.haip' on 'rac-two' CRS-2677: Stop of 'ora.cluster_interconnect.haip' on 'rac-two' succeeded CRS-2677: Stop of 'ora.drivers.acfs' on 'rac-two' succeeded CRS-2677: Stop of 'ora.ctssd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.cssd' on 'rac-two' CRS-2677: Stop of 'ora.cssd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.gipcd' on 'rac-two' CRS-2677: Stop of 'ora.gipcd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.gpnpd' on 'rac-two' CRS-2677: Stop of 'ora.gpnpd' on 'rac-two' succeeded CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'rac-two' has completed CRS-4133: Oracle High Availability Services has been stopped. [root@rac-two bin]# ./crsctl start crs -excl -nocrs CRS-4123: Oracle High Availability Services has been started. CRS-2672: Attempting to start 'ora.mdnsd' on 'rac-two' CRS-2676: Start of 'ora.mdnsd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.gpnpd' on 'rac-two' CRS-2676: Start of 'ora.gpnpd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.cssdmonitor' on 'rac-two' CRS-2672: Attempting to start 'ora.gipcd' on 'rac-two' CRS-2676: Start of 'ora.cssdmonitor' on 'rac-two' succeeded CRS-2676: Start of 'ora.gipcd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.cssd' on 'rac-two' CRS-2672: Attempting to start 'ora.diskmon' on 'rac-two' CRS-2676: Start of 'ora.diskmon' on 'rac-two' succeeded CRS-2676: Start of 'ora.cssd' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.drivers.acfs' on 'rac-two' CRS-2679: Attempting to clean 'ora.cluster_interconnect.haip' on 'rac-two' CRS-2672: Attempting to start 'ora.ctssd' on 'rac-two' CRS-2681: Clean of 'ora.cluster_interconnect.haip' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.cluster_interconnect.haip' on 'rac-two' CRS-2676: Start of 'ora.drivers.acfs' on 'rac-two' succeeded CRS-2676: Start of 'ora.ctssd' on 'rac-two' succeeded CRS-2676: Start of 'ora.cluster_interconnect.haip' on 'rac-two' succeeded CRS-2672: Attempting to start 'ora.asm' on 'rac-two' CRS-2676: Start of 'ora.asm' on 'rac-two' succeeded [root@rac-two bin]# su - grid [grid@rac-two ~]$ sqlplus / as sysasm SQL*Plus: Release 11.2.0.4.0 Production on Fri Mar 28 00:13:30 2014 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Real Application Clusters and Automatic Storage Management options SQL> col name for a30 SQL> col path for a50 SQL> set linesize 200 SQL> select name,path from v$asm_disk; no rows selected SQL> alter system set asm_diskstring='/dev/asm-disk*'; System altered. SQL> select name,path from v$asm_disk; NAME PATH ------------------------------ -------------------------------------------------- /dev/asm-diskg /dev/asm-diskd /dev/asm-diskc /dev/asm-diskf /dev/asm-diskh /dev/asm-diskm /dev/asm-diskk /dev/asm-diskj /dev/asm-diski /dev/asm-diskb /dev/asm-diske NAME PATH ------------------------------ -------------------------------------------------- /dev/asm-diskl 12 rows selected. SQL> select name,state from v$asm_diskgroup; NAME STATE ------------------------------ ----------- DATADG DISMOUNTED GIDG DISMOUNTED TESTDG DISMOUNTED SQL> alter diskgroup gidg mount; Diskgroup altered. SQL> select name,state from v$asm_diskgroup; NAME STATE ------------------------------ ----------- DATADG DISMOUNTED GIDG MOUNTED TESTDG DISMOUNTED SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Real Application Clusters and Automatic Storage Management options [grid@rac-two ~]$ exit logout [root@rac-two bin]# ./ocrctl replace votedisk +GIDG -bash: ./ocrctl: No such file or directory [root@rac-two bin]# ./crsctl replace votedisk +GIDG Successful addition of voting disk 4b55dbd068344fb6bfb89250b3586256. Successful addition of voting disk 6b157dc173bd4f7ebf1846df01c23d5d. Successful addition of voting disk 505d811a77d64f57bfa2797afba6a5f5. Successfully replaced voting disk group with +GIDG. CRS-4266: Voting file(s) successfully replaced
至此完成了ocr和votedisk的恢复。
重启crs,查看状况:
[root@rac-two bin]# ./crsctl stop crs CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'rac-two' CRS-2673: Attempting to stop 'ora.mdnsd' on 'rac-two' CRS-2673: Attempting to stop 'ora.drivers.acfs' on 'rac-two' CRS-2673: Attempting to stop 'ora.ctssd' on 'rac-two' CRS-2673: Attempting to stop 'ora.asm' on 'rac-two' CRS-2677: Stop of 'ora.mdnsd' on 'rac-two' succeeded CRS-2677: Stop of 'ora.asm' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.cluster_interconnect.haip' on 'rac-two' CRS-2677: Stop of 'ora.ctssd' on 'rac-two' succeeded CRS-2677: Stop of 'ora.drivers.acfs' on 'rac-two' succeeded CRS-2677: Stop of 'ora.cluster_interconnect.haip' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.cssd' on 'rac-two' CRS-2677: Stop of 'ora.cssd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.gipcd' on 'rac-two' CRS-2677: Stop of 'ora.gipcd' on 'rac-two' succeeded CRS-2673: Attempting to stop 'ora.gpnpd' on 'rac-two' CRS-2677: Stop of 'ora.gpnpd' on 'rac-two' succeeded CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'rac-two' has completed CRS-4133: Oracle High Availability Services has been stopped. [root@rac-two bin]# ./crsctl start crs CRS-4123: Oracle High Availability Services has been started. [grid@rac-two ~]$ crsctl stat res -t -------------------------------------------------------------------------------- NAME TARGET STATE SERVER STATE_DETAILS -------------------------------------------------------------------------------- Local Resources -------------------------------------------------------------------------------- ora.DATADG.dg ONLINE ONLINE rac-two ora.GIDG.dg ONLINE ONLINE rac-two ora.LISTENER.lsnr ONLINE ONLINE rac-two ora.TESTDG.dg ONLINE OFFLINE rac-two ora.asm ONLINE ONLINE rac-two Started ora.gsd OFFLINE OFFLINE rac-two ora.net1.network ONLINE ONLINE rac-two ora.ons ONLINE ONLINE rac-two ora.registry.acfs ONLINE ONLINE rac-two -------------------------------------------------------------------------------- Cluster Resources -------------------------------------------------------------------------------- ora.LISTENER_SCAN1.lsnr 1 ONLINE ONLINE rac-two ora.LISTENER_SCAN2.lsnr 1 ONLINE ONLINE rac-two ora.LISTENER_SCAN3.lsnr 1 ONLINE ONLINE rac-two ora.cvu 1 ONLINE ONLINE rac-two ora.oc4j 1 ONLINE ONLINE rac-two ora.rac-one.vip 1 ONLINE INTERMEDIATE rac-two FAILED OVER ora.rac-two.vip 1 ONLINE ONLINE rac-two ora.rac.db 1 ONLINE ONLINE rac-two Open 2 ONLINE OFFLINE ora.scan1.vip 1 ONLINE ONLINE rac-two ora.scan2.vip 1 ONLINE ONLINE rac-two ora.scan3.vip 1 ONLINE ONLINE rac-two [grid@rac-two ~]$
在节点一重启crs资源,将其加入集群。
[root@rac-one bin]# ./crsctl start crs CRS-4123: Oracle High Availability Services has been started. [root@rac-one bin]# ./crsctl stat res -t -------------------------------------------------------------------------------- NAME TARGET STATE SERVER STATE_DETAILS -------------------------------------------------------------------------------- Local Resources -------------------------------------------------------------------------------- ora.DATADG.dg ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.GIDG.dg ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.LISTENER.lsnr ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.TESTDG.dg OFFLINE OFFLINE rac-one ONLINE OFFLINE rac-two ora.asm ONLINE ONLINE rac-one Started ONLINE ONLINE rac-two Started ora.gsd OFFLINE OFFLINE rac-one OFFLINE OFFLINE rac-two ora.net1.network ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.ons ONLINE ONLINE rac-one ONLINE ONLINE rac-two ora.registry.acfs ONLINE ONLINE rac-one ONLINE ONLINE rac-two -------------------------------------------------------------------------------- Cluster Resources -------------------------------------------------------------------------------- ora.LISTENER_SCAN1.lsnr 1 ONLINE ONLINE rac-one ora.LISTENER_SCAN2.lsnr 1 ONLINE ONLINE rac-two ora.LISTENER_SCAN3.lsnr 1 ONLINE ONLINE rac-two ora.cvu 1 ONLINE ONLINE rac-two ora.oc4j 1 ONLINE ONLINE rac-two ora.rac-one.vip 1 ONLINE ONLINE rac-one ora.rac-two.vip 1 ONLINE ONLINE rac-two ora.rac.db 1 ONLINE ONLINE rac-two Open 2 ONLINE ONLINE rac-one Open ora.scan1.vip 1 ONLINE ONLINE rac-one ora.scan2.vip 1 ONLINE ONLINE rac-two ora.scan3.vip 1 ONLINE ONLINE rac-two [root@rac-one bin]#
至此完成了ocr和votedisk的恢复。
THAT‘s all!!!!!

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InnoDB는 팬텀 읽기를 차세대 점화 메커니즘을 통해 효과적으로 방지합니다. 1) Next-Keylocking은 Row Lock과 Gap Lock을 결합하여 레코드와 간격을 잠그기 위해 새로운 레코드가 삽입되지 않도록합니다. 2) 실제 응용 분야에서 쿼리를 최적화하고 격리 수준을 조정함으로써 잠금 경쟁을 줄이고 동시성 성능을 향상시킬 수 있습니다.

MySQL은 프로그래밍 언어가 아니지만 쿼리 언어 SQL은 프로그래밍 언어의 특성을 가지고 있습니다. 1. SQL은 조건부 판단, 루프 및 가변 작업을 지원합니다. 2. 저장된 절차, 트리거 및 기능을 통해 사용자는 데이터베이스에서 복잡한 논리 작업을 수행 할 수 있습니다.

MySQL은 오픈 소스 관계형 데이터베이스 관리 시스템으로, 주로 데이터를 신속하고 안정적으로 저장하고 검색하는 데 사용됩니다. 작업 원칙에는 클라이언트 요청, 쿼리 해상도, 쿼리 실행 및 반환 결과가 포함됩니다. 사용의 예로는 테이블 작성, 데이터 삽입 및 쿼리 및 조인 작업과 같은 고급 기능이 포함됩니다. 일반적인 오류에는 SQL 구문, 데이터 유형 및 권한이 포함되며 최적화 제안에는 인덱스 사용, 최적화 된 쿼리 및 테이블 분할이 포함됩니다.

MySQL은 데이터 저장, 관리, 쿼리 및 보안에 적합한 오픈 소스 관계형 데이터베이스 관리 시스템입니다. 1. 다양한 운영 체제를 지원하며 웹 응용 프로그램 및 기타 필드에서 널리 사용됩니다. 2. 클라이언트-서버 아키텍처 및 다양한 스토리지 엔진을 통해 MySQL은 데이터를 효율적으로 처리합니다. 3. 기본 사용에는 데이터베이스 및 테이블 작성, 데이터 삽입, 쿼리 및 업데이트가 포함됩니다. 4. 고급 사용에는 복잡한 쿼리 및 저장 프로 시저가 포함됩니다. 5. 설명 진술을 통해 일반적인 오류를 디버깅 할 수 있습니다. 6. 성능 최적화에는 인덱스의 합리적인 사용 및 최적화 된 쿼리 문이 포함됩니다.

MySQL은 성능, 신뢰성, 사용 편의성 및 커뮤니티 지원을 위해 선택됩니다. 1.MYSQL은 효율적인 데이터 저장 및 검색 기능을 제공하여 여러 데이터 유형 및 고급 쿼리 작업을 지원합니다. 2. 고객-서버 아키텍처 및 다중 스토리지 엔진을 채택하여 트랜잭션 및 쿼리 최적화를 지원합니다. 3. 사용하기 쉽고 다양한 운영 체제 및 프로그래밍 언어를 지원합니다. 4. 강력한 지역 사회 지원을 받고 풍부한 자원과 솔루션을 제공합니다.

InnoDB의 잠금 장치에는 공유 잠금 장치, 독점 잠금, 의도 잠금 장치, 레코드 잠금, 갭 잠금 및 다음 키 잠금 장치가 포함됩니다. 1. 공유 잠금을 사용하면 다른 트랜잭션을 읽지 않고 트랜잭션이 데이터를 읽을 수 있습니다. 2. 독점 잠금은 다른 트랜잭션이 데이터를 읽고 수정하는 것을 방지합니다. 3. 의도 잠금은 잠금 효율을 최적화합니다. 4. 레코드 잠금 잠금 인덱스 레코드. 5. 갭 잠금 잠금 장치 색인 기록 간격. 6. 다음 키 잠금은 데이터 일관성을 보장하기 위해 레코드 잠금과 갭 잠금의 조합입니다.


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