SQLSERVER manual growth of log files and data files manual growth of log files, in fact, is to modify the size of the log file unit is MB set the size of the log file is 2048 MBALTERDATABASE [GPOSDB] MODIFYFILE (nameGPOSDB_Log, size2048) EXECsys. [sp_helpdb] @ d
SQLSERVER manual Log File growth and data file manual Log File growth, in fact, the unit for modifying the log FILE size is MB. Set the log FILE size to 2
-- Mysql ssl generates a key1 check whether ssl is enabledMysql> show variables like '% ssl % ';+ --------------- + ---------- +| Variable_name | Value |+ --------------- + ---------- +| Have_openssl | DISABLED || Have_ssl | DISABLED || Ssl_ca || Ssl_capath || Ssl_cert || Ssl_cipher || Ssl_crl || Ssl_crlpath || Ssl_key |+ --------------- + ---------- +9 rows in set (0.00 sec)2 is not enabled, so openSet the ssl parameter at the end of my. cnf and restart the mysql service.Mysql> show variables l
): 512 bytes/512 bytesI/O size (minimum/optimal): 512 bytes /512 bytesDisk label type: dosDisk identifier: 0x00093e4e # record the partition information Device Boot Start End Blocks Id System/dev/sda1 * 2048 62914559 31456256 83 Linux # Switch to the Command (m for help) with the sector as the computing unit ): uChanging display/entry units to sectors. # if the preceding content is displayed, proceed to the next step. If it is displayed as Command (m
partitions.
6) Run df-I to check the inode quantity and usage, and run dumpe2fs/dev/sda1 to check the inode and block size and quantity.
7) a block can only be used by one file. If a small block is too large, the remaining space is wasted and cannot be used by other files.
8) the larger the block, the better. Select the block based on the file size of the business. Generally, the default value is 4 kb.
9) The inode and block size can be changed during formatting. mkfs. ext4-B
how to allocate them. The following figure shows the meaning of each parameter. As shown in, first look at the bottom brown part,AM Parametersmapreduce.map.memory.mb=1536MBWhich indicates that AM needs to apply for 2048 MB of resources for map iner, but the memory actually allocated by RM is MB, becauseyarn.scheduler.mininum-allocation-mb=1024MBThis defines that RM should be allocated at least 1024 MB, and 1536MB exceeds this value, so the actual val
How to generate a key using ssl in mysql: bitsCN.com -- mysql ssl
1 check whether ssl is enabled
Mysql> show variables like '% ssl % ';
+ --------------- + ---------- +
| Variable_name | Value |
+ --------------- + ---------- +
| Have_openssl | DISABLED |
| Have_ssl | DISABLED |
| Ssl_ca |
| Ssl_capath |
| Ssl_cert |
| Ssl_cipher |
| Ssl_crl |
| Ssl_crlpath |
| Ssl_key |
+ --------------- + ---------- +
9 rows in set (0.00 sec)
2 is not enabled, so open
Set the ssl parameter at the end of my. c
each piece."Input Format"The first line, an integer N, represents the size of the collection.The next five lines each row N integers, representing the elements within these five sets."Output Format"If you can find five numbers that match the criteria, output "YES" or Output "NO"."Sample Input"31-2 9-1 2 1-3 5 1-1 7 6-4-1-7"Sample Output"YES"Data Size"For 30% data, 1 For 50% data, 1 For 100% of data, 1
Code#include Eight o'clock Liver T3, looks very difficult ah, ghost
Parametet.mClc;clear;load ('src.mat'20482048= Exp (-j* (2*pi/8192= exp (j*1*pi/);This file lists the parameters used in the value case, Src.mat file is the original data stored in MATLAB, data: 2048*1 data, each data is scientific notation.Load command, you can load data from a file into a project for later use (how to use it, and also rely on a modular simulation diagram).CZT_W/A are the complex numbers in exponential form: the operations of complex
table
P print the partition table
Q quit without saving changes
S create a new 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 (experts only)
Command (m for help): n
Command action
E extended
P primary partition (1-4)
E ---------------> select extended partition
Partition number (1-4): 2
First sector (2048-41943039, default
returned. The total number represents the total number of bytes available for the body.
Here is an example with 2048 bytes. Note that the difference between the start point and the focus is omitted.
Open requestThe first 1024 bytes
Sent by the browser:
GET/dota2/techies.mp4HTTP/1.1
Host:localhost:8000
Range:bytes=0-1023
Server return:
HTTP/1.1216PartialContent
Date:Mon,15Sep201422:19:34GMT
Content-Type:video/mp4
Content-Ran
It is helpful to think about everything in C language from the perspective of computer memory. We can think of computer memory as a byte array. Each address in the memory represents 1 byte. For example, if our computer has 4 K memory, the memory array will have 4096 elements. When talking about a pointer to a storage address, we should be talking about a pointer that stores an element index of the memory array. When a pointer is referenced in reverse order, the value pointed to by the index in t
); str_len-= len; str = str + len ;... if (data_len = OS _FILE_LOG_BLOCK_SIZE-LOG_BLOCK_TRL_SIZE) {/* write a block */... len + = LOG_BLOCK_HDR_SIZE + LOG_BLOCK_TRL_SIZE; log-> lsn = ut_dulint_add (log-> lsn, len );...} else/* Change lsn */log-> lsn = ut_dulint_add (log-> lsn, len );...}
The LSN is not reduced. It is the unique identifier of the log location. There are lsn in the redo log write, checkpoint build, and PAGE header.
About log writing:
For example, if the LSN of the current redo lo
be increased to 2048, if not enough, to 4096, and so on.
In the presence of too many open files problem, first find out the main reason. The biggest possibility is that the open file or socket does not shut down properly. To locate whether the problem is caused by a Java process, view the current process occupancy file descriptor through the Java process number:
Lsof-p $java _pid The specific properties of each file descriptor
Lsof-p $java _pid |
own CA root certificate, the effect is the same, you can also save the authority to issue a certificate to the CA fee (Internet applications to distribute their own CAs to countless Internet users, very difficult)
Here's how to create your own CA
1. Preparation work
First in a random directory, create the following subdirectories:
/private
/certificates
Where private is the private key and CSR (described later), certificates is in the certificate
2. Create CA private key
OpenSSL code
[[emailprotected] ~]# mke2fs-t ext4-b 2048/dev/sdb1# is specified as a ext4 format with a block size of 2048; here's a command MKFS.EXT4 equivalent to Mke2fs-t EXT4MKE2FS 1.42.9 (28-dec-2013) Filesystem label=os type:linuxblock size=2048 (log=1) Fragment size=2048 (log=1) stride=0 blocks, Stripe width=0 blocks131072
exceeds the configured value, the system rejects requests for other file operations and throws a Too program open files exception. Such restrictions can be divided into system and user levels. System Level:System-level settings are valid for all users. You can view the maximum file limit of the system in two ways.1Cat/proc/sys/fs/file-max 2Sysctl-Check the number of fs. file-max configurations in the result.Modify the/etc/sysctl. conf file and configure the fs. file-max attribute if the attribu
/newcerts/
3.1 openssl genrsa 2048> ca-key.pem3.2 openssl req-new-x509-nodes-days 1000-key ca-key.pem> ca-cert.pem [Root @ mysql newcerts] # openssl req-new-x509-nodes-days 1000-key ca-key.pem> ca-cert.pemYou are about to be asked to enter information that will be ininitializedInto your certificate request.What you are about to enter is what is called a Distinguished Name or a DN.There are quite a few fields but you can leave some blankFor some field
markers and ECC data. Typically NAND flash is read and programmed on a page basis, while erasing is block-based. Nand Flash programming can only be programmed to 1 to 0, and not 0 programming to 1, so in the page programming, must have been erased first.I use NAND flash for Samsung's k9f4g08u0e, a page with (2048+64) Byte, a block has 64 pages, the capacity size is (512m+16m) byte, is a 8-bit wide SLC Nand flash.NAND flash drivers should generally im
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