insta360 8k

organization table, so the data and index, the index is the data. The data segment is the leaf point of the B + Tree (leaf node segment) and the index segment is a non-indexed node of the B + data (non-leaf nodes segment). The rollback segment is more special later in the introduction. Segments are managed by the engine itself.C. DistrictA zone is a space made up of contiguous pages. The InnoDB Storage Engine page is 16KB in size and has 64 contiguous pages in one area, so each area is 1MB in s

, the leaf node at the bottom of the tree is a doubly linked list, so there should be at least two rows of records in each page, which determines that InnoDB cannot exceed 8k when storing a row of data, but in fact it should be smaller , because there are some INNODB internal data structure to be stored, after 5.6 version, the new option Innodb_page_size can be modified, in the previous version of 5.6, can only modify the source code recompile, but it

defaults to the 16KB,INNODB Storage engine table for the Index organization table, the leaf node at the bottom of the tree is a doubly linked list, so there should be at least two rows of records in each page, which determines that InnoDB cannot exceed 8k when storing a row of data, but in fact it should be smaller , because there are some INNODB internal data structure to be stored, after 5.6 version, the new option Innodb_page_size can be modified,

Let's take a look at what jumbo frames is.We know that in the TCP/IP covariance cluster, the Ethernet Data Link layer communicates in frames (frame), the size of 1 frames is set to 1,518 bytes, the MTU of the traditional 10M nic frame (Maximum transmission Unit Max transmission Unit) The size is 1500 bytes (as shown in the example), the base 14 bytes are reserved to the frame header, 4 bytes are reserved to the CRC checksum, actually go to the entire TCP/IP header 40 bytes, valid data is 1460 by

= ' T2 ' Select class, Flag, state, Lru_flag from X$BHwhere Dbarfil = 1 and dbablk = 61433; The specifics of the use of the pool by the object (considering the situation of various pools) SelectO.object_name,Decode (state,0, ' free ', 1, ' Xcur ', 2, ' Scur ', 3, ' Cr ', 4, ' read ', 5, ' Mrec ',6, ' Irec ', 7, ' write ', 8, ' pi ') state,COUNT (*) blocksFrom X$bh B, dba_objects owhere b.obj = o.data_object_id and state GROUP BY O.object_name, stateOrder by blocks ASC; Select Decode (wbpd.bp_id

" >>/etc/profile"No password Login"Ssh-keygen create public keys and keys.Ssh-copy-id Copy (append) the public key of the local host to the Authorized_keys file on the remote host.Ssh-copy-id also sets the appropriate permissions for the remote host user home directory (home) and ~/.ssh, and ~/.ssh/authorized_keysyou need to ensure that the configuration in/etc/ssh/sshd_config is: Authorizedkeysfile. Ssh/authorized_keysStep 1: Create a public key and key on the local host with Ssh-key-gen[Email

Forms of SQL Server data storage Before talking about several different ways to read, you first need to understand how SQL Server data is stored. The smallest unit of SQL Server storage is a page. Each page size is 8k,sql server is atomic to read a page, or read a page, or simply not read it, There is no middle state. The data between pages is organized into B-tree (please refer to my previous blog post). So SQL Server for logical read, prefetch

page size, and the default is 16K. The following note indicates that the value can be set to a second party that must be 2. For this value can be set to 4k,8k,16k,32k,64k, there is no meaning in the big.When you change the univ_page_size, you need to change the univ_page_size_shift the number of times the value is 2 is univ_page_size, so set the data page as follows: #define Univ_page_size_shift an If univ_page_siz=4k #define Univ_page_size

How to create an Oracle large file table space Sql>create bigfile tablespace Table name DataFile ' d:\ndo\ddo\ table name. DBF ' SIZE 500M autoextend on; Sql>create bigfile tablespace BF_IMAGES_XP DataFile ' e:\datacenter\bf\bf_images_xp.dbf ' size 500M autoextend on; The description is as follows: Create a large table space, the name is: BF_IMAGES_XP, the data file is E:\DATACENTER\BF\BF_IMAGES_XP.DBF Initialization size is 500M and the file grows automatically Sql>create bigfile table

: compressed anddynamic，两种格式对blob字段采用完全溢出的方式，数据页中只存放20字节，其余的都存放在溢出段中，因此，强烈不建议使用BLOB、TEXT、超过255长度的VARCHAR列类型；650) this.width=650; "Src=" http://images2015.cnblogs.com/blog/268981/201704/268981-20170416172232149-2104583353. JPG "style=" border:0px; "/>The 1.3 InnoDB page size defaults to the 16KB,INNODB Storage engine table for the Index organization table, the leaf node at the bottom of the tree is a doubly linked list, so there should be at least two rows of records in each page, which determine

-15default buffer cache INITIALIZING db_cache_size 2.2817E+10 2.2817E+10 2.2817E+10 complete 26-dec-15 26-d Ec-15asm Buffer Cache STATIC db_cache_size 0 0 0 Complete 26-dec-15 26-dec-15default buffer cache STATIC db_cache_size 0 2.2817E+10 2.2817E+10 Complete 26-dec-15 26-dec-15default 2K buffer cache STATIC db_2 K_cache_size 0 0 0 Complete 26-dec-15 26-dec-15default 4K buffer Cache STATIC db_4k_cache_size 0 0 0 Complete 26-dec-15 26-dec-15d Efault

Tags: idle unnecessary form fetching number object storage 2.4 used space is not BERDatabase storage structureDivided into: physical storage structure and logical storage structure.The physical structure and logical structure are separated, and the storage of physical data does not affect access to the logical structure.1. Physical storage structureDatabase filesOS Block2. Logical storage structureTablespace table SpaceSegment segmentExtend expansion ZoneDB block data block (

of contiguous pages (page), and in any case each area is 1MB in size, in order to guarantee the continuity of the page, the InnoDB storage engine requests 4-5 extents at a time from disk. By default, the InnoDB storage engine has a page size of 16KB, which is 64 contiguous pages in a zone. (1mb/16kb=64) innodb1.0.x version began to introduce compressed pages, each page size can be set by the parameter key_block_size to 2K, 4K, 8K, so each region corr

--------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------------- ----------------------------------/ocp_data02/datafiles/mytest01. DBF MYTEST 10485760 NO 0[Email protected]>ALTER tablespace MYTEST ADD datafile '/ocp_data02/datafiles/mytest02. DBF ' SIZE 10M autoextend on;Tablespace altered.[Email protected]>ALTER tablespace MYTEST ADD data

Recently made a voice changer of the project, which involves a lot of audio-related knowledge, afraid of a long time to remember, write down the memo.1. Encoding of The VoiceVoice recording when to choose an encoding format, because the mobile side of the reason, this encoding format needs to meet the compression ratio, sound quality is better (at least can be heard after the voice), but also the difficulty of coding small.We chose several formats earlier: AMR, Speex, AAC, WAV. The advantages an

different nodejs process ports), but this basic work, in fact, should be given to Ngnix to complete.Below we can look at a multi-site proxy example, Suppose you have a node. js process that is listening on port 8080, and you want to access the connection from domaina.com to a Web site that is serviced by node. JS and maps the connection from domainb.com into another static file service, you can use the following ngix.confg (for 1.44), the configuration is relatively simple, the general writing

$ body_bytes_sent "$http _referer" "$http _user_agent" $http _x_forwarded_for '; #access_log / www/log/access.logaccess;}}When accessing static resources, the worker_proccess and worker_connections are set correctly, the most performance improvement isOpen_file_cache max=204800 inactive=20s;open_file_cache_min_uses 1;open_file_cache_valid 30s;These several, cache file resources. I used the AB test performance explosion growth, originally sent 1000 requests and 1000 to 10 seconds, plus immedia

Use Python for data analysis _ Pandas _ basic _ 2, _ pandas_2Reindex method of Series reindex In [15]: obj = Series([3,2,5,7,6,9,0,1,4,8],index=['a','b','c','d','e','f','g', ...: 'h','i','j'])In [16]: obj1 = obj.reindex(['a','b','c','d','e','f','g','h','i','j','k'])In [17]: obj1Out[17]:a 3.0b 2.0c 5.0d 7.0e 6.0f 9.0g 0.0h 1.0i 4.0j 8.0k NaNdtype: float64 If the current value of the new index is missing, interpolation is required. Fill in the forward value with

Buffers1Using flow to output dataBufferedReader bufr=NewBufferedReader (NewFileReader ("Client.txt"));2 3 //by using PrintWriter to process the byte stream and the character stream, take over the stream4PrintWriter out =NewPrintWriter (S.getoutputstream (),true);5 6 //start reading, upload to service side7String line=NULL;8 while((Line=bufr.readline ())! =NULL){9 out.println (line);Ten}1 //to put the received data into the stream2BufferedReader bufin

(10000); //2. Receiving data from the serverSocket s=ss.accept (); //put the accepted data into the streamBufferedReader bufin=NewBufferedReader (NewInputStreamReader (S.getinputstream ())); //specifies the file to be written toBufferedWriter bufw=NewBufferedWriter (NewFileWriter ("Server.txt")); //start reading//The default size of the buffer is 8k, one to 8k will automatically refresh, if there is no end