inspiron 600m

MySQL InnoDB log mechanism in-depth analysishttp://blog.csdn.net/yunhua_lee/article/details/65678691.1.Log CheckpointInnoDB transaction log refers to redo log, which is called log, stored in the log file ib_logfile* inside. InnoDB There is another log of undo logs, but the undo log is stored in the shared tablespace (ibdata* file).Because log and checkpoint are closely related, these two parts are analyzed together.Noun Explanation: LSN, log sequence number, InnoDB's log sequence number is a 64

Label: Copyright notice: Respect Bo Master Labor results, welcome reprint, reproduced please indicate the source-love technology of Andy Log Checkpoint InnoDB transaction log refers to redo log, which is called log, stored in the log file ib_logfile* inside. InnoDB there's another one. Undo Log The Undo log is stored in the shared tablespace (ibdata* file). Because log and checkpoint are closely related, these two parts are analyzed together. Noun Explanation: L

database is started. System altered.sql> alter system set processes = Scope=memory; ----Because this parameter does not support dynamic modification, it cannot be implemented immediately and the next boot fails.alter system SET processes = Scope=memory*ERROR at line 1:Ora-02095:specified initialization parameter cannot be modifiedSql>sql> alter system set Pga_aggregate_target = 600m scope=memory; ---because this parameter supports dynamic modificatio

that are not properly closed Quick fix Weibo database:Mysqlcheck-r-q-uroot-p123 Weibo5.5 Also, view the CPU and I/O performance methodsViewing CPU PerformanceParameter-P is the number of CPUs to display, all for all, or only the first few to displayViewing I/O performanceThe parameter-m is displayed in m units, the default K. %util: When 100% is reached, I/O is busy. Await: The request waits in the queue for a time that directly affects the read time. I/O limit: IOPS (r/s+

= "Wkiom1vtpfmcety9aadbdizbn9a400.jpg"/>#参数-P is the number of CPUs displayed, all for all, or only the first few CPUs650) this.width=650; "Src=" http://s3.51cto.com/wyfs02/M00/6D/D5/ Wkiol1vtppayb7weaalqhx41buc367.jpg "title=" 3.png "alt=" Wkiol1vtppayb7weaalqhx41buc367.jpg "/>#查看I/O Performance650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/6D/D9/wKiom1VtPSXTsI4zAAMkfVf2r-I743.jpg "title=" 1.png " alt= "Wkiom1vtpsxtsi4zaamkfvf2r-i743.jpg"/>#参数-M is displayed in m units, the default

space, simply add space to the LV, first close the swap area, the expansion and then to activate swap. [Email protected] ~]# Swapoff/dev/mapper/volgroup-lv_swap[Email protected] ~]# lvextend-l +600m/dev/mapper/volgroup-lv_swapSize of logical volume Volgroup/lv_swap changed from 2.91 Gib (746 extents) to 2.93 GIB (751 extents).Logical volume Lv_swap successfully resized.[[email protected] ~]# LVSLV VG Attr lsize Pool Origin data% meta% Mo

:Print(plt_x)ifplt_x%1000==0:cm=' Hot'Norm= Matplotlib.colors.Normalize (Vmin=min, vmax=max) Map=plt.imshow (plt_arr,interpolation='Nearest', Cmap=cm,norm=norm, origin='Upper') Plt.xticks ([]) plt.yticks ([]) Plt.axis ('off') #Plt.colorbar (mappable=map,ax=none,shrink=0.5, pad=0)Plt.savefig ("Filename.png", dpi=1320) #plt.show () Print("-------------------------->") Print(plt_x) plt_x+=1Temp_str=Str (num_now)returndonser_now_labled

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to personal circumstances, Home should be more than 15G. If it's multi-user, it's going to be big n times. The last partition is "/swap", is used for virtual memory, Linux systems rarely use virtual memory, unless the physical memory is too small, not always enough. Swap is usually twice times the size of physical memory, but is generally not recommended for more than 1G, if you have 128M memory is divided into 300M, 256 memory is divided into 500,512m memory 800m,1g memory will be divided int

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limitSu-studentDD If=/dev/zero of=/pub/file bs=1m count=51Dd:error writing '/pub/file ': Disk quota exceeded # #提示超出配额51+0 Records in50+0 Records out52428800 bytes (* MB) copied, 0.039447 s, 1.3 GB/sQuotaDisk Quotas for User student (UID 1000):Filesystem blocks Quota limit grace files quota limit Grace/DEV/VDB1 51200* 0 51200 1 0 0QUOTAOFF/DEV/VDB1 # #取消磁盘配额功能Quotas are for partitioning, setting how much data a user can write to this partitionVim/etc/fstab/dev/vdb1/pub XFS Defaults,usrquota 0 0

● LVM Build1. Divide the physical partition and change the partition ID to 8ePvs|pvdisplay Viewing physical volumesVgs|vgdisplay Viewing physical volume groupsLvs|lvdisplay to view logical volume devicesMonitoring commandsWatch-n 1 \' echo ' = = = Pvinfo = = = "\;p vs\; echo "= = = Vginfo = = =" \; vgs\; echo "= = = Lvinfo = = =" \; lvs\;d f-h/mnt 'CreatePVCREATE/DEV/VDB1 physical partitions into physical volumesVgcreate WESTOS/DEV/VDB1 to make a physical volume group of/DEV/VDB1 This physical v