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Postgresql has added the External table access function since 9.1. This function allows the database to directly read files other than the database, such as csv or text files. DML is not supported for the moment. Postgresql has various plug-ins that can directly connect to various heterogeneous databases, such as Oracle_fdw, mysql_fdw, and file_fdw. It is very convenient for data migration, which is a strong performance of postgresql's scalability. This section describes how to use file_fdw of f

day, equipment, output from t order by 1, 2 ') AS t (day date, DAT501 integer, DAT502 integer, DAT503 integer );Day | dat501 | dat502 | dat503------------ + --------2010-04-01 | 100 | 120 | 1302010-04-02 | 110 | 105 || 125 || 100 | 200 |(4 rows) Iii. SolutionCrosstab also has a usage that contains two input parameters. This can solve the above problem.Test = # SELECT * FROM crosstab ('select day, equipment, output from t order by 1,2 ', $ values ('dat501': text), ('dat502 ':: text), ('dat503':

it in the production environment. Download a full cache patch from PostgreSQL: Free in http://linux.bkjia.com/ The username and password are both www.bkjia.com The specific download directory is in/July 6,/July 14,/PostgreSQL, where the cache patches are completely refreshed. For the download method, see PostgreSQL details: click herePostgreSQL: click here PostgreSQL 9.3 materialized view usage Four tips for using PostgreSQL database date type PostgreSQL deletes duplicate data rows in

database in Ubuntu Server 14.04 Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling PostgreSQL on Windows Configuration and installation of LAPP (Linux + Apache + PostgreSQL + PHP) Environment in Ubuntu Install and configure phppgAdmin on Ubuntu Install PostgreSQL9.3 on CentOS Configure a Streaming Replication cluster in PostgreSQL How to install PostgreSQL 7/6 and phpPgAdmin in CentOS 5/6. 4 -------------------------------

['extra_login_security']=false; Find this line: $conf['owned_only']=false; Change the value to true. $conf['owned_only']=true; Save and close the file. Restart the postgresql service and Apache service. sudosystemctl restart postgresql sudosystemctl restart apache2 Or, sudo service postgresql restart sudo service apache2 restart Open your browser and navigate to http: // ip-address/phppgadmin. You will see the following. PhpPgAdmin Log On with the user you created earlier. I have

_ %' order by relname ))Order by table name, attnum; -- Data dictionary -- Lite versionSelect(Select relname from pg_class where oid = a. attrelid) as table_name,(Select description from pg_description where objoid = oid and objsubid = 0) | 'table' | '(' | relname | ') 'from pg_class where oid =. attrelid) as table name,A. attname as column name,Format_type (a. atttypid, a. atttypmod) as type,Col_description (a. attrelid, a. attnum) as descriptionFrom pg_attribute a where attstattarget =-1 and

date, overdue account)Drop function wx_cmd_hdb (day_id numeric, acct_month numeric); -- delete a FUNCTIONSelect * from temp_wuxi_qf overdue account; -- Query tableDrop table temp_wuxi_qf overdue account; -- delete a table PostgreSQL API File Download ------------------------------------------ Split line ------------------------------------------ Free in http://linux.bkjia.com/ The username and password are both www.bkjia.com The specific download directory is for PostgreSQL process language lea

to understand, there are a lot of destructive operations such as DROP, and when the data volume is large, it takes a lot of time and space. Not recommended. Method 2: Add a field -- Add a new field with the serial typeAlter table weather add column id SERIAL;-- Delete duplicate rowsDelete from weather WHERE idNot in (SELECT max (id)FROM weatherGroup by city, temp_lo, temp_hi, prcp, date);-- Delete the added FieldAlter table weather drop column id; You need to add a field. "I don't know how Post

Running Environment: Primary: 192.168.111.150Standby: 192.168.111.15119425111.152os: CentOS5.8PostgreSQL: 9.1.2 or later. Streaming Replication is supported. PostgreSQL cache details Compiling PostgreSQL on Windows Configuration and installation of LAPP (Linux + Apache + PostgreSQL + PHP) Environment in Ubuntu Install and configure phppgAdmin on Ubuntu Install PostgreSQL9.3 on CentOS1. It is best to have the same environment for the Primary and Standb

Prerequisites Readers of this article should install LFS at least once. If you have not done LFS, this article may not be suitable for you. Please follow the Linux thoroughly customized guide to perform LFS first. In addition, if you are interested in compilation optimization, the GCC compilation optimization guide is also worth reading. Target Youbest's masterpiece "5 MB Apache server" and its continued article "K Apache server" Bring LFS to the extreme, amazing! However, many practical people

space, which is 26% less than the disk space used to create three indexes. Other problems still exist. in addition, such indexes may be of no use for other queries of the same data. therefore, if we have several different types of valuable data, this advantage will not exist if we save disk space.[4] The relevant query plan ): ------------------------------------ Lili split line ------------------------------------ Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling P

f_get_member_info (4, 1, '', 'South China tech stores') as member (member_num text, mname text, name text, discount_rate real, account numeric (16,2 ), integral int, phone text, birthday date, qq int, email text, onAccount int, status int, address text, tip text, start_date date, valid_date int, store_nam text ); 5 test results ------------------------------------ Lili split line ------------------------------------ Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling

text )';EXECUTE SQL; SQL: = 'create table _ '| id |' _ employee (id int, name text )';EXECUTE SQL; SQL: = 'create table _ '| id |' _ sale_bill (id int, name text )';EXECUTE SQL; ....... Return num; END; $ BODY $ LANGUAGE plpgsql VOLATILE ------------------------------------ Lili split line ------------------------------------ Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling PostgreSQL on Windows Configuration and installation of

default. Only "tcp 127.0.0.1: 5432 LISTEN" is displayed when netstat-tuln is used ". Modify listen_address = * in postgresql. conf to LISTEN to all ports so that you can remotely log on to the database through TCP/IP. Use netstat-tuln to view "TCP 0.0.0.0: 5432 LISTEN ". ------------------------------------ Lili split line ------------------------------------ Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling PostgreSQL on Windows Configuration and installation of

. Visibility judgment logic: But it also brings about another problem: Without undo, it will lead to space growth. Therefore, PostgreSQL introduces the vacumm background process to regularly clean up the DEAD tuple. I will write an article about vacumm Principles later. ------------------------------------ Lili split line ------------------------------------ Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling PostgreSQL on Windows Configuration and installation of

physical storage space of tables slows down. In the next article, we will focus on source code implementation. See ------------------------------------ Lili split line ------------------------------------ Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling PostgreSQL on Windows Configuration and installation of LAPP (Linux + Apache + PostgreSQL + PHP) Environment in Ubuntu Install and configure phppgAdmin on Ubuntu Install

" mentioned above ". In addition, when the PostgreSQL database is initialized, the first position of xlog starts at the logical offset of XLOG_SEG_SIZE. Therefore, when the size is 16 MB, The Minimum File number is "0001ffffffffff00000001" instead of "0001ffffffff00000000 ". The xlog record pointor is invalid starting from "0". The following is an illegal xlog record pointor defined in the source code. Next we can use an experiment to verify the above process: 1. First, reset the current xlog l

: refers to the records actually stored in the table. Special space: stores the information of the index Access Method (AM: Access Method). Different index Access methods have different contents. However, if it is the page of the table, it is null and there is no information. The source code is in src/backend/storage/page/bufpage. c. The following is Page initialization: The 24 bytes of Page header are described as follows: The source code of PageHeader is defined as follows: Here, PageXLogRe

, the updated xmin, xmax, cmin, and cmax in the tuple header provide the judgment basis for transaction visibility.Isolation: Initialize the transaction Isolation level during StartTransaction. Provides the foundation for creating snapshot for MVCC.Duarability: implemented through CommitTransaction, commit transaction logs, and so on. Provides the foundation for data recovery and persistence. Implement the WAL (Write Ahead Log) function. ------------------------------------ Lili split line -----

, there is a clear decrease in the average processing time after the migration. Finally, we are very satisfied with the current results, and we will certainly not miss MongoDB. Its performance is very good, its processing scheme is eclipsed by other databases, and the Data Query Process is very satisfactory compared with MongoDB (especially for non developers ). Even though we still have a service (Olery Feedback) that uses MongoDB (even though it runs on an independent, relatively small cluster