Reprinted, please indicate the source and author of the article!
Source: http://blog.csdn.net/xl19862005
By xandy)
In the previous article, I briefly explained the code modification part involved in adding the recovery function. After the code is modified successfully, it is not equal to the required function, there are still a lot of problems to solve after compilation is completed to the target board!
After one day of hard work, Bootloader and recovery are added and compiled successfully. Aft
Disklabel c toggle the DOS Compatibi Lity flag D Delete a partition L list known partition types m print this menu n add a new partition O Create a new empty DOS partition table p print the partition table Q quit without saving changes s create a NE W Empty Sun Disklabel t change a partition ' s system ID u cHange Display/entry units v Verify the partition Table W write table to disk and exit X extra functionality (E Xperts only) Command (M-help): Ncommand action E Extended P primary partitio
customer a clean database, if there are many tables involved, it takes not only time to clear them one by one, but also prone to errors and missing/deleted. Here I provide a method, you can quickly and effectively clear data in all tables of a specified database. For your reference only.
-- Remove all data from a databaseSET NOCOUNT ON-- Tables to ignoreDECLARE @ IgnoreTablesTABLE (TableName varchar (512 ))Insert into @ IgnoreTables (TableName) VA
** papszmetadata = podriver-> getmetadata ();Podataset2 = podriver-> Create (strfilepath2, nimgsizex, nimgsizey, nbandcount, gdt_byte, papszmetadata );// Set the image coordinates. If this step is missing, the created image cannot be opened with ERDAS.Podataset2-> setgeotransform (adfgeotransform );//////////////////////////////////////// /////////////// Block Processing. Divide the image into many blocks of 512*
and missing/deleted. Here I provide a method, you can quickly and effectively clear data in all tables of a specified database. For your reference only.
-- Remove all data from a database
SET NOCOUNT ON
-- Tables to ignore
DECLARE @ IgnoreTables
TABLE (TableName varchar (512 ))
Insert into @ IgnoreTables (TableName) VALUES ('sysdiagrams ')
DECLARE @ AllRelationships
TABLE (ForeignKey varchar (512)
, TableN
roughly divided into five steps: Additional fill bit additional length initialization hash buffer calculation information digest output/return additional fill bit length theoretical basis for the message
Additional fill spaceMake the modulo 512 and 448 cool (M % 512 = 448 ). Even if the conditions are met, 512 bits must be filled ). The filling process is as fol
1. QuestionsWhat is the difference between a direct mount drive and a mount partition in Linux?such as/dev/sdb's hard drive, directly mkfs.ext4/dev/sdb after mount use,and the first Fdisk partition, which is used in the MKFS on Mount,What is the difference between the two?2. Answer 1Are you sure you don't want to partition? Instead of a hard drive just into one area?Direct use of/dev/sdb hard drive, direct MKFS.EXT4Can I use it?3. Answer 2The operation is as follows:[Email protected]_storage
Before also more or less know Linux Disk Management, including hard disk, logic disk, LVM, but not system, but yesterday in the examination of the Linux database is still encountered a lot of problems and confusion, and by the way to review the relevant knowledge.First look at the situation of the disk: Df-kFile system 1k-block already used% mount point available/dev/mapper/vg_sspdb1-lv_root51606140 2754580 46230120 6%/Tmpfs 32984140 0 32984140 0%/dev/shm/DEV/SDA1 495844 38042 432202 9%/boot/dev
Debug Notes:First step: Read the physical sector 0.The four bytes starting from offset 0X1CA (458) are: 0x7,0x5b,0x1e,0x00;And the number of sectors is: 0x1e5b07=. Each sector is 512 bytes. So the SD card capacity is: *512/1024/1024mbyteThe 4 bytes starting from offset 0x1c6=454 are: 0xf9,0x00,0x00,0x00, which indicates that the boot sector is in the 0xf9=249 sector. Get the SD card more detailed informatio
In practical applications, when we are ready to hand over a project to the customer for use, we need to clear all the tables in the library before the test data to give the customer a clean database, if the table involved a lot, to be emptied, not only time-consuming, but also error-prone and omitted, here I provide a method, Can quickly and efficiently empty the data for all tables in the specified database. For reference only, please exchange different views.
--remove all data from a database
--------------------------------------------------------------------------------9930/Dev/oracleasm/disks/VOTE_CRS1
6 rows selected.
Ii. Urgent Handling
When the database is connected to the generative database, the asm space is insufficient.ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files NameMounted extern n 512 4096 1048576 860159 0 405780 0 n arch/Mounted normal n
In practical applications, when we want to hand over a project to the customer, we need to clear all the previous test data of all tables in the database to give the customer a clean database, if there are many tables involved, it takes not only time to clear them one by one, but also prone to errors and missing/deleted. Here I provide a method, you can quickly and effectively clear data in all tables of a specified database. For your reference only.
-- Remove all data from a database
SET NOCOUN
This article describes how to batch clean up the content of a specified database in sqlserver. If you need it, refer to.
This article describes how to batch clean up the content of a specified database in sqlserver. If you need it, refer to.
The Code is as follows:
-- Remove all data from a databaseSET NOCOUNT ON-- Tables to ignoreDECLARE @ IgnoreTablesTABLE (TableName varchar (512 ))Insert into @ IgnoreTables (TableName)
into structural Roots groups. Coefficients and roots are single-precision floating-point numbers. Each coefficient tuple corresponds to one root tuple. The program allocates n coefficient tuples and n root tuples. N is a large number (n = 512M element, exactly 512*1024*1024 = 536,870,912 elements). The coefficient structure and root structure are as follows:The simple program calculates real roots x1 and X2 According to the above formula. We also use
Usually when you add a new hard drive to the virtual machine, you may see that the new hard drive is not loaded automatically. This is because the SCSI bus connected to the hard disk needs to be rescan to make the new hard drive visible. Here is a simple command to rescan the SCSI bus and SCSI devices. The following steps have been tested in CentOS 7 and Rhel 7.
Add a new 20G hard drive to ESXi or vcenter:
Displays the current disk partition:
The code is as follows:
[Root@centos7
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