simplicity 8192

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In sqlserver, determine the set configuration of the current session)

explicitly defined as null. 2048 Ansi_null_dflt_off Change the session behavior to not use ANSI compatibility null. NULL values are not allowed for new columns that are not explicitly defined as null. 4096 Concat_null_yields_null Returns NULL when concatenating null values with strings. 8192 Numeric_roundabort An error is generated when the expression precision is reduced. 16384 Xact_abort I

The simplest Embedded Operating System

Implement an embedded operating system that can't do anything 1. First determine the CPU. Here we use embedded CPU for simplicity, such as the arm series. The reason why we use a short Instruction Set)The convenience of a type of CPU is that there is no distinction between the real mode and the protection mode, and linear unified addressing is adopted, that is, the segment is not requiredPage-based memory management, or the chip is integrated with so

Detailed implementation of the PXE server deployment process under Linux system

# show ' Boot: ' PromptTimeout 60 # Wait timeout, unit 1/10 seconds, automatically start default specified label after timeoutDisplay Boot.msg # Displays the contents of boot.msg, the file path is relative to the root directory of the TFTP server (default/tftpboot), so the boot.msg file absolute path is in/tftpboot/boot.msg.F1 Boot.msg # Press the ' F1 ' key to display the fileF2 options.msgF3 general.msgF4 param.msgF5 rescue.msgLabel 1 # ' label ' specifies the keyword you entered at the ' Boo

Most complete sysctl.conf optimization to improve Linux performance

Sysctl is an interface that allows you to change the Linux system you are running. It contains advanced options for TCP/IP stacks and virtual memory systems, which allows experienced administrators to improve compelling system performance. Sysctl can be read to set more than 500 system variables. Based on this, SYSCTL (8) offers two features: Read and modify system settings.first look at a well tuned sysctl.conf simple configuration that may apply to some friendssysctl.conf Configuration paramet

Implement a simple Embedded Operating System

Implement a simple Embedded Operating System (1) Implement an embedded operating system that can't do anything1. First determine the CPU. Here we use embedded CPU for simplicity, such as the arm series. The reason why we use a short Instruction Set)The convenience of a type of CPU is that there is no distinction between the real mode and the protection mode, and linear unified addressing is adopted, that is, the segment is not requiredPag

Specify LOB parameter RETENTION, a small BUG in PCTVERSION

')--------------------------------------------------------------------------------LOB ("PIC") store (TABLESPACE "LOBTB" enable storage in row chunk 8192 PCTVERSION 10-The default LOB is PCTVERSION.NOCACHE LOGGINGSTORAGE (INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645PCTINCREASE 0 FREELISTS 1 freelist groups 1 BUFFER_POOl default ))LOB ("DES") store (TABLESPACE "LOBTB" enable storage in row chunk 81

Ext2/ext3 Structure Analysis

...... * % O ....0000110: 0000 0000 0000 0000 0000 0000 0000 ................All 0 s...20173f0: 0000 0000 0000 0000 0000 0000 0000 ................ We can see that the superblock format is small Based on the ext3_super_block structure and the English description,The first is u32, 205e 0000, that is, 5e20, decimal 24096, total inodeThe second is also u32, 6678 0100, that is, 17866, decimal 96358, the total number of blocksThe two numbers match dumpe2fs/dev/sda1. 5.Copy backupThe backup of super

Jvm gc description

[0x1ebd0000, 0x227d0000, 0x227d0000)Eden space 49152 K, 99% used[0x1ebd0000, 0x21bce430, 0x21bd0000)From space 6144 K, 55% used[0x221d0000, 0x22527e10, 0x227d0000)To space 6144 K, 0% used [0x21bd0000, 0x21bd0000, 0x221d0000)Tenured generation total 69632 K, used 2696 K [0x227d0000, 0x26bd0000, 0x26bd0000)The space 69632 K, 3% used[0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000)Compacting perm Gen total 8192 K, used 2898 K [0x26bd0000, 0x273d0000, 0x2

Obtain network resource information in the delhpi Program

(all machines) and resource class. Type: resourcetype_disk (File resource), resource usage: resourceusage_container (all container resources ), The network level is the highest level (nil). In this way, you can obtain a handle to further list network resources. The specific procedure section is as follows: {Res: DWORD; lphenum: thandle ;} Res: = wnetopenenum (resource_globalnet, resourcetype_disk, Resourceusage_container, nil, lphenum ); If res (2) You can use the wnetenumresource API function

Memory collection algorithm and optimization parameters of Java Virtual Machine

[0x21bd0000, 0x21bd0000, 0x221d0000)Tenured generation total 69632 K, used 2696 K [0x227d0000, 0x26bd0000, 0x26bd0000)The space 69632 K, 3% used[0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000)Compacting perm gen total 8192 K, used 2898 K [0x26bd0000, 0x273d0000, 0x2abd0000)The space 8192 K, 35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)Ro space 8192 K

Freeze file header, freezefileheader

/orcl3939_ora_4862.trcData file #1:Name #7:/u01/app/oracle/oradata/orcl3939/system01.dbfCreation size = 0 block size = 8192 status = 0xe head = 7 tail = 7 dup = 1Tablespace 0, index = 1 krfil = 1 prev_file = 0Unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00Checkpoint cnt: 1223 scn: 0x0000. 0080ab79 05/22/2015 23:01:37Stop scn: 0xffff. ffffffff 05/21/2015 12:23:57Creation Checkpointed at scn: 0x0000.00000007 08/13/2009 23:00:53Thread: 0 rba :( 0x

Oracle heap size xxk exceeds notification threshold (2048 K) Solution

$. trigflag fromsys. ku $ _ Fhtable_view Ku $ where not (bitand (KU $. Property, 8192) = 8192) and not bitand (KU $. schema_obj.flags, 128 )! = 0and Ku $. obj_nu Trace file content: [Xezf @ localhost bdump] $ CAT/home/oracle_app/admin/xezf/bdump/xezf_dw01_4774.trc /Home/oracle_app/admin/xezf/bdump/xezf_dw01_4774.trc Oracle Database 10g enterprise editionrelease 10.2.0.1.0-Production With the partitioning,

Java Performance Optimization-sun hotspot jdk jvm parameter settings

[0x1ebd0000, 0x227d0000, 0x227d0000)Eden space 49152 K, 99% used[0x1ebd0000, 0x21bce430, 0x21bd0000)From space 6144 K, 55% used[0x221d0000, 0x22527e10, 0x227d0000)To space 6144 K, 0% used [0x21bd0000, 0x21bd0000, 0x221d0000)Tenured generation total 69632 K, used 2696 K [0x227d0000, 0x26bd0000, 0x26bd0000)The space 69632 K, 3% used[0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000)Compacting perm Gen total 8192 K, used 2898 K [0x26bd0000, 0x273d0000, 0x2

JVM tuning Summary-XMS-xmx-xmn-XSS

: Print the time when the program is suspended during garbage collection. Can be used together with the aboveOutput Format:Total time for which application threads were stopped: 0.0468229 seconds -XX: printheapatgc: Print detailed stack information before and after GCOutput Format:34.702: [GC {heap before GC invocations = 7:Def New Generation total 55296 K, used 52568 K [0x1ebd0000, 0x227d0000, 0x227d0000)Eden space 49152 K, 99% used[0x1ebd0000, 0x21bce430, 0x21bd0000)From space 6144 K, 55% u

How to configure JVM Parameters

K, 99% used [0x1ebd0000, 0x21bce430, 0x21bd0000) From space 6144 K, 55% used [0x221d0000, 0x22527e10, 0x227d0000) To space 6144 K, 0% used [0x21bd0000, 0x21bd0000, 0x221d0000) Tenured generation total 69632 K, used 2696 K [0x227d0000, 0x26bd0000, 0x26bd0000) The space 69632 K, 3% used [0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000) Compacting perm Gen total 8192 K, used 2898 K [0x26bd0000, 0x273d0000, 0x2abd0000) The space

PHP socket client and server-side application Example

) ); } /** * Accept data from client*/ Public functionRead$client _socket){ returnSocket_read ($client _socket, 8192);//8192 The actual representation of the accepted length, I use 819292 to indicate a bit longer, so that a longer string can also be accepted, less than 8192 is OK, will automatically identify }}$socket _server=Newsocketserver ();$socket _s

JVM tuning summary, jvm Tuning

: Print the time when the program is suspended during garbage collection. Can be used together with the above Output Format:Total time for which application threads were stopped: 0.0468229 seconds -XX: PrintHeapAtGC: Print detailed stack information before and after GC Output Format: 34.702: [GC {Heap before gc invocations = 7: Def new generation total 55296 K, used 52568 K [0x1ebd0000, 0x227d0000, 0x227d0000) Eden space 49152 K, 99% used[0x1ebd0000, 0x21bce430, 0x21bd0000) From sp

If you want to view the size of Oracle data blocks and operating system blocks

1. 1. Run SQLshowparameterdb_block_sizeNAMETYPEVALUE in the Command window: ----------------------------------------------------------------------------- db_block_sizeinteger81922. 2. Run the following command in the SQL window: query the db_block_size (81) of the instance. 1. 1. run SQL show parameter db_block_size NAME TYPE VALUE ------------------------------------------ mongodb_block_size integer 8192 2 and 2 in the Command window: // query the db

Linux MKE2FS (format disk partition)

of blocks to write. So if your disk is very small and very small files, such as 1k or 2k, it is recommended to format the disk when you specify a smaller number of blocks. Ext File system default block size is 4096 that is 4k. In the format, you can specify the block size is 1024, 2048, 4096 (they are multiplied), although the format can be specified when the block size of more than 4096, but once more than 4096 is not normal mount, how to specify the block size? [[emailprotected]~]#mke2fs-text

Maximum number of processes and maximum files in Linux

maximum available virtual memory for the process, in Kbytes Ulimit–v 200000; Limit the maximum available virtual memory to 200000 Kbytes Based on the table above, if you need to set the maximum number of processes and the number of open files for the current user, just set the following: Ulimit-u 8192 Sets the maximum number of processes for the current user to 8192 and only takes ef

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