postgres uuid

1. view the uuid of liunx Ll/dev/Disk/by-UUID D4ec5ce9-f863-452b-ac7f-d9dd0cf32a86-> ../sda3E5bcb376-ec13-46c8-801f-2a51b38372c1-> ../sda1F87c200b-faf1-4d27-a88b-456dd803b047-> ../sda2 ========================================================== = 2. view the uuid of SVN on liunx CD/opt/SVN/apsrc/project1/ Ll In the directory Conf DB Format Hooks Locks

This article comes from http://my.oschina.net/noahxiao/blog/132277, personal storage use1. BackgroundWhen I use Hibernate to do object mapping, I always use the UUID to master the key. Since Hibernate's UUID needs to occupy 32-bit characters, it generally makes people feel more efficient and increase storage usage.When I looked at the company project, I found a better way to build the

(source, from, range,0, range.length); returnrange; } }UUID Generation ProgramThis build UUID program contains two encodings of Base64 (Urlsafe) and Base58. PackageOrg.noahx.uuid.util;Importorg.apache.commons.codec.binary.Base64;ImportJava.nio.ByteBuffer;ImportJava.util.UUID; Public Abstract classUuidutils { Public StaticString uuid () {

The globally unique identifier (guid,globally unique Identifier) is also known as the UUID (universally unique Identifier).A GUID is a numeric identifier generated by the algorithm with a binary length of 128 bits. The format of the GUID is "Xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx", where X is a 32-bit hexadecimal number in the range of 0-9 or a-f. Ideally, no computer or computer cluster will generate two identical GUIDs.The total number of GUIDs reache

In the project, you need to change the original id to uuid, so you can directly use the uuid library in boost to generate a uuid. However, during the test, it was found that the program performance was severely degraded. In the past, 0.6 million pieces of data could be processed per minute, and only about 20 thousand pieces of data could be processed after

Note: UUID-universally unique identifiers is a globally unique identifier. I. How to obtain the uuid of a Linux disk partition 1. [San @ localhost ~] $ LS-L/dev/Disk/by-UUID/ Total 0Lrwxrwxrwx 1 Root 10 2010-01-18 0733f5c1-cb85-4f98-9d4f-122cfcee9806-> http://www.cnblogs.com/sdc1 Lrwxrwxrwx 1 Root 10 2010-01-18 03754-1bdb-> http://www.cnblogs.com/sda5Lrwxrwxrwx 1

1 // discover Asset Primary key 2 @Id3 @GeneratedValue (generator= "System-uuid")4 @ Genericgenerator (name= "System-uuid", strategy= "UUID")5 private Long ID; 　　The GUID is a 128-bit long number, typically represented by a 16 binary. The core idea of the algorithm is to combine the machine's NIC, local time, and a random number to generate the GU

I. How to obtain UUID in Linux disk partition 1. # fdisk-lDisk/dev/sda: 1000.2 GB, 1000204886016bytes240heads, 63 sectors/track, 129201 cylindersUnits = cylindersof15120 * 512 = 7741440 bytesSectorsize (logical/physic I. How to obtain the UUID of a Linux disk partition 1. # fdisk-lDisk/dev/sda: 1000.2 GB, 1000204886016 bytes240 heads, 63 sectors/track, 129201 cylindersUnits = cylinders of 15120*512 = 774144

How to generate UUID in PHP, the method of survival uuid. The code is as follows: function guid () {if (function_exists (' Com_create_guid ')) {return com_create_guid ();} Else{mt_srand (Double) microtime () *10000)//optional for PHP 4.2.0 and up. $charid = Strtoupper (MD5 (Uniqid (rand (), true) ); $hyphen = CHR;//"-" $uuid = Chr (123)//"{". substr ($charid,

My error message......Global1.cpp: 39: 23: UUID/UUID. h: no such file or directoryGlobal1.cpp: In static member function 'static quuid Global: generateuuid ()':Global1.cpp: 188: ': uuid_generate' undeclared (first use here)Make [1]: *** [. OBJ/Linux-generic-G ++ // global1.o] Error 1Make [1]: Leaving directory '/usr/src/qtopia-free-1.7.0/src/libraries/qtopia1'Make: *** [libraries/qtopia1] Error 2You have ne

Three ways to view the UUID of a device are summarized below:1 Command view: Blkid2 file Views: Ls-l/dev/disk/by-uuid3 Command view: VOL_ID/DEV/SDA1The role and significance of UUID1: It's really the only signThe UUID provides a unique identification string for the storage device in the system, regardless of the type of device. If you start up in the system and use a drive letter mount, you may not find the

Postgres log utility has to say that Postgres logs (pg_log, similar to the oracle alter file, rather than pg_xlog) are indeed flexible and feature-rich, the following are some management functions using ipvs logs. The parameters involved are in the file $ PGDATApostgresql. conf. OS: CentOS6.2DB: Postgre Postgres log utility has to say that

The last in a series of Postgres posts, Pat Shaughnessy wrote based on he presentation at the Barcelona Ruby Conference. You can also watch the video recording of the presentation. The series was originally published in his personal blog, and we is republishing it on codeship with his kind permission. You can also read posts one, both, and three in the series.We all know indexes is one of the most powerful and important features of relational database

POSTGRES-XL Cluster construction and testing CentOS6.5 192.168.0.101 CentOS6.5 192.168.0.102 CentOS6.5 192.168.0.103 CentOS6.5 192.168.0.104 First, host planning Cnode1 (GTM) cnode2 (Gtm_proxy,coordinator,datanode) cnode3 (Gtm_proxy,coordinator,datanode) cnode4 ( Gtm_proxy,coordinator,datanode) Cnode5 (Gtm_proxy,coordinator,datanode) Second, configure host hosts on each node #vim/etc/hosts 192.168.0.101 cnode1 192.168.0.102 cnode2 192.168.

"Editor's note" as an open source object-relational database, Postgres has been loved by many developers. Recently, Postgres officially released version 9.5, which has been a lot of repair and functional improvements. This article will share 10 Postgres usage tips, which are designed to enable developers to use the database more flexibly and efficiently.During th

provided by using the revolutionary serializable snapshot Isolation (SSI) level. Today we start with the basics of PostgreSQL and talk about the features of MVCC and PostgreSQL. Here, we first use a table to show the level of transaction in PostgreSQL, and we can turn it back when we see the later chapters. 1. Basic Knowledge 1.1 Transaction ID When a transaction begins, the transaction management system in PostgreSQL assigns a unique identifier, the transaction ID (TXID), to the t

POSTGRES-XL is a fully acid-compliant, open-source, easy to scale, multi-tenant security. Support share-nothing; Support massive data parallel processing-mpp (massively Parallel processing). is not very similar to Greenplum. Host Assignment3 host, install centos6.2. Of course, you can prepare more than one server; This depends on the scenario (the GTM is a separate host; The exception is that each machine is best equipped with one coordinator and one

Step 4 of sourceetcprofile. Go to supostgres user psql-Upostgres-dmydblt; usrlocalpgsqlsharecontribuuid-ossp. SQL Source/etc/profile step 4. Enter su postgres user psql-U postgres-d mydb lt;/usr/local/pgsql/share/contrib/uuid-ossp. SQL Notes 1. find/-name uuid-ossp.so search to see if there is If not. Click here t

Sometimes, what if I forget the password of the default user Postgres when PostgreSQL is installed?Linux shell command input below: sudo-u postgres psql (so that you can directly login into the Postgres, and then in the inside can be added users, change passwords and so on, are not the problem!! ）-------------------------------------------------------------------

Tags: distributed database? POSTGRES-XL: PostgreSQL-based open source extensible DB cluster The recent year the industry to the "IoE" more calls louder, many traditional enterprises have to go to the "IoE" program on the desktop. I always wonder what motivates these non-internet companies, such as banks, to do such things. Tall on the "self-control", "Revitalization of National Science and Technology" and other empty slogan first not to tube, the r