postgres transaction

Q. What does XL stand? XL is short for extensible lattice. It also connotes an extra large version of postgresql, in this case when SS multiple systems. Q. Is this a "nosql" solution? No, ipvs-XL supports traditional SQL, stronugly conforms to ansi SQL: 2008, is fully acid, all while being scalable. you can however certainly use it as a key-value store and take advantage of JSON and hstore functionality. Q. Is the data "sharded "? Yes. postgres-X

;Warning:terminating connection because of crash of another server processDetail:the postmaster have commanded this server process to roll back the current transaction and exit, because another s Erver Process exited abnormally and possibly corrupted shared memory.Hint:in a moment you should is able to reconnect to the database and repeat your command.Server closed the connection unexpectedlyThis probably means the server terminated abnormallyBefore o

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

first, what is POSTGRES-XLXL means: Extensible Lattice, can be extended lattice, will be the PostgreSQL application on multi-machine distributed database visualization expression.POSTGRES-XL is a full-acid, open-source, scalable, multi-tenant secure, PostgreSQL-based database solution.The POSTGRES-XL is flexible enough to handle a wide range of loads, such as: OLAP (parallelization via MPP) Olt

Recently, I have been working on a project related to PostgreSQL database, documenting the knowledge that I have learned in this process. About PostgreSQL database online already have too many relevant introduction, in order to blog the system or first look at the Wikipedia on the PostgreSQL database introduction.PostgreSQL is a free object-relational database server (database management system), issued under a flexible bsd--style license. It provides a choice for users in addition to other open

isedb software, support, training and professional services to integrate open source software into their existing data infrastructures.Based in Bedford, MA, EnterpriseDB is backed by strategic private investors."In addition to the Internet also saw a successful case of the Japanese Telecommunications Company (NTT) using PostgreSQL to o ppt: https://www.pgcon.org/2011/schedule/attachments/203_NTT_Case_307.pdf, but the new problem has come, can PostgreSQL scale horizontally to cope with the datab

Postgres is a very good open-source database. Good performance. When it comes to databases, there's the topic of backup and import. Backups are also broken down in a number of ways. 1. Full backup This is the way most people use it to back up the entire database, including all database objects, such as user tables, system tables, indexes, views, and stored procedures. But it takes more time and space, so it's generally recommended to do a full backup

-wide version of concurrency control (MVCC).When you start a trade or query at POSTGRES-XL, you will see consistent data across the cluster. When you read your data in a connection, even in the absence of any lock in the other connection,You can update the same table. Thanks to global transaction identifiers and snapshots, these connections are using their own version of the row. The reader and the writer d

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

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!! ）-------------------------------------------------------------------

Function Introduction POSTGRES-XC/XL/X2 is an open source project. It provides a multiple-master synchronous, transparent, PostgreSQL cluster solution. Unlike other cluster tools, it has a strong scalability when writing data, and introduces the concept of cluster environment with multiple master architectures. Multi-master means that when writing data, it is no longer subject to a single master node and will be well improved in writing speed.

Tags: logging writing default installation operation memory RAM parameter configuration CREATE indexBecause it is a development phase, there are no parameters configured for Postgres, all using the default configuration at the time of installation,It's not unusual to run in the past, but my CPU resource usage has suddenly risen in the last few days.Review the process, found that there is a postgres process

Tags: mysql SQL Server Oracle Backup RecoveryThe following list only gives the simplest usage of backup and recovery of each database, more detailed parameters and configuration please refer to the relevant information First, MySQL: Parameter description: $user $password $targethost $port $charset $dbname $table $filename User name Password IP (local localhost) Port Coding Database name Table name (

PGXL Cluster ConstructionA preparation1 Download Install decompression source/opt/Curl-o http://files.postgres-xl.org/postgres-xl95r1beta1.tar.gzTAR-ZXVF postgres-xl95r1beta1.tar.gzMV Postgres-xl95r1beta1.tar.gz POSTGRES-XL2 compiling$ yum-y gcc$ CD POSTGRES-XL$ pwd/opt/

1. Prepare Create a base table first: CREATE TABLE mytb1 (ID serial,name character varying,age integer);To create an index on the name field: Create INDEX Mytb1_name_index on MYTB1 (name); To view the MYTB1 table structure: postgres=# \d mytb1; Table "public.mytb1" Column | Type | Modifiers --------+-------------------+--------------------------------------------