PostgreSQL

In heap, we rely on PostgreSQL to support most back-end heavy tasks, we store each event as a hstore blob, and we maintain a PostgreSQL array of completed events for each tracked user and sort those events by time. Hstore allows us to attach

Installing modules Note: My operating environment is Ubuntu 10.04 and PostgreSQL 8.4. First install the Postgresql-contrib package and restart the database server, and then check the contrib directory to see if there are any available modules:

Accustomed to MySQL, want to try to use the next PostgreSQL, it is said that this thing is also very strong, I searched the Internet related Chinese books, but the related books are far less than MySQL, but I found in the official translation by the

Tag:sql   lib   mac   sq    boot     style   data    connection    iv    Because you want to use the recommended rails-template. Need to use Postgres. And initializes a user postgres, the password is postgres. (e.g. $ createuser -d postgres  )Need

After figuring out the principle of the log number, a little bit of forgetting about it for a while, simply tidying it up again:(i) Wal file naming rules1) Xlog log file (10.1 becomes Pg_wal) in the Pg_xlog directory below the $pgdata

In MySQL, if you need to clear the table, you only needTRUNCATE table_name;Then, if there is a self-increment ID field, it will revert back to 1,However, PostgreSQL is slightly different from MySQL, and the self-increment field of PostgreSQL is

PostgreSQL starts with the systemThe document describe the Configure automatic start PostgreSQL when the system starts.The ways suitable for systemd on CentOS 7.0 or latest release.1. Create and configure Postgresql.service#

1. Initialize the configuration1). pubdbpostgres=# CREATE DATABASE pubdb;postgres=# \c PubdbConnected to Database "PUBDB" as User "Postgres".pubdb=# CREATE TABLE t1 (ID bigserial primary key, name varchar (20));CREATE TABLEpubdb=# Create publication

Since MySQL was acquired by Oracle, PostgreSQL has become the first choice for open-source relational databases.This article describes the installation and basic usage of PostgreSQL for first-time users to get started. The following is based on the

This is a test that was done a long time ago, recently in the collation of the PostgreSQL data related to the test, so also took it out to share with you.First explain the so-called PostgreSQL space performance, mainly based on the postgis of

PostgreSQL comes with a client pgadmin, there is a backup, recovery options, but also to restore the database (restore), but recently found that the database slowly large, often error, the backup of the file process error probability that is quite

Here the parts of the canonical predicate expression are sorted out, and the order of reading is as follows:One, PostgreSQL code Analysis, query optimization section, canonicalize_qualTwo, PostgreSQL code Analysis, query Optimization section,

Three file formats are used for testing:ISO-8859NETPBM PBM ImageAsciiif[$ (File $filename |grep-c "ISO-8859")-GT 0]Then Echo "ISO-8859"Psql-C"copy $schemaname. $tbname from ' $dirname/$filename ' with (format ' csv ', delimiter ', Encoding ' iso-8859

Ctid: Represents the physical business information of a data record, which is the displacement of the data block in which a record is located.   Same as the pseudo-column ROWID in Oracle, except in the form of a different one. For example, there is

What is BarmanBarman (Backup and Recovery Manager) is a convenient backup and recovery tool in the PostgreSQL database server that allows remote backup of multiple servers, allowing a single command from a single backup set to restore the database.

Installation process: 1. Configuration--prefix=prefix Install all files under the directory PREFIX instead of Usr/local/psql--with-pgport=number Set number as the default port number for server and clients,the default is

PostgreSQL installs a detailed collection of LinuxInstall the 8.4.4 version here and download the Postgresql-8.4.4-1-linux.bin first.(http://www.postgresql.org/download/) Download the linux32 version of1. If the file is not on a Linux system, drag

I. restore disk space In PostgreSQL, the data rows deleted or updated using the delete and update statements are not actually deleted, the physical address of the old data row sets the row status to deleted or expired. Therefore, when data in a

I. Index type:PostgreSQL provides a variety of index types: B-tree, hash, GIST, and gin. Because they use different algorithms, each index type has a suitable Query type, saving time and resources, the create Index Command creates a B-tree index.1.

Limited energy, only one script can be maintained temporarily, so MySQL and the original lnpp are unified PHP 5.4.10 + nginx1.0.15 + PostgreSQL 9.1.3 source code compilation automated deployment Third