how to work for pg e

The device exception in the cluster (the addition and deletion of the exception OSD) can result in inconsistent data between the various copies of the PG, and data recovery is required so that all replicas are in a consistent state.First, the OSD Fault and treatment methods:1. The type of malfunction of the OSD: Fault A: A normal OSD because the device is abnormal, resulting in the OSD does not work properl

Crush Algorithm1, the purpose of crushOptimize allocation data, efficiently reorganize data, flexibly constrain object copy placement, maximize data security when hardware fails2. ProcessIn the Ceph architecture, the Ceph client is directly read and written to the Rados Object stored on the OSD, so ceph needs to go through (pool, Object) → (pool, PG) →osd set→osd/disk complete link to allow Ceph client Know exactly where the target data object is loca

Ruby on rails gem install pg cannot be installed, rubyrails gem install pg -v '0.18.2'Building native extensions. This could take a while...ERROR: Error installing pg: ERROR: Failed to build gem native extension. current directory: /Users/bevan/.rvm/gems/ruby-2.3.0/gems/pg-0.18.2/ext/Users/bevan/.rvm/rubies/rub

The Ceph Crush algorithm (controlled Replication under Scalablehashing) is an algorithm based on data distribution and replication for random control.Basic principle:Storage devices typically support stripe to increase storage system throughput and improve performance, and the most common way to stripe is to do raid. As RAID0.The data is distributed in strips on the hard disk in the array, which is the stored procedure of the data in all the hard drives in the display. The data in the file is se

Calculating the PG Count formula for a single poolPoolpgcount= ((TARGETPGSPEROSD)? ( Osdnumber)? (datapercent)) /poolsizeParameter introduction name Description Notes Pool PG Count Number of PG in a single pool Target PGs Per OSD Number of PGS per OSD A) If the number of OSD in t

Export command- - 5432 - -- inserts-t human_info > D:\human_info_backup.sql testdbCommand descriptionPg_dump: is the backup command that comes with the PG database, and in the bin directory, all execution must be performed in the bin directory.- H: Specify the host address, which is the server of the PG database, the host address specified here is localhost- P: Specify the host port, is the port of the

that is competitiveness. So we still need to pay attention to these three kinds of formats of mixed use. When to use GIF when to use PNG when to use JPG? We hit analysis below. In the actual work, I found that the general color of the graphic, such as some small icons, tiled background with less color, then as the GIF format, although there are only 256 colors, but to deal with this type of picture that must be very appropriate. Of course, do not rul

you cannot enter it in the command line. Therefore, we do not recommend this... 8. After configure is successful, make will be followed. 9 if the installation is successful after make install, the interface shown in is displayed. 10. Modify the permission of the PostgreSQL installation directory. The default installation directory is under/usr/local/pgsql. Modify the permission command to chmod-r 777/usr/local/pgsql After running, all files in the pgsql directory will have the xwr (X: executa

This example describes the database operations classes available in MYSQL,MSSQL,PG three databases, and you can easily change the type of your database as long as you make any changes. Share it for your reference. The specific analysis is as follows: Function List, index: Open: Opening database connection line:71Close: Closes the database connection line:107SELECTDB: Select Database line:129Query: Creating Queries line:151Dataseek: Move record point

Tags: span random suitable for importing ice [] adb Lin OtaThis article will introduce how to import and export the PG database, the main use is the PG comes with pg_dump, Pg_dumpall, Pg_restore, Psql and other commands, version is 9.4 (different versions of pg_dump \ Pg_ The restore option may be somewhat different, please note).The overall idea of exporting and importing is: Export global objec

(starting from 1) line:548 The code is as follows Copy Code /********************************************************************************** This class encapsulates database operations with good portability for databases: MYSQL,MSSQL,PG * Original Author: Andrzej Manczyk finishing: Jade face e-mail/msn:xiuluo-999@163.com Time: 2006-12-20* ******************************************************************************

The script code is as follows:Ceph PG Dump | awk '/pg_stat/{col=1; while ($col! = "Up") {col++}; col++}/[0-9a-f]+. [0-9a-f]+/{match ($0,/^[0-9a-f]+/); Pool=substr ($ Rstart, rlength); poollist[pool]=0;Up= $col; i=0; rstart=0; rlength=0; Delete Osds; while (Match (up,/[0-9]+/) >0) {osds[++i]=substr (up,rstart,rlength); up = substr (UP, Rstart+rlength)}For (i in Osds) {array[osds[i],pool]++; osdlist[osds[i]];}}END {printf ("\ n");printf ("Pool: \ t"); F

PG processing time is very flexible, +-*/both have supportIt's useful to have a extract function in the meantime, let's take a look at a few examples: [code]postgres=# Select Extract (Epoch from ' 1970-01-01 ':: timestamp);Date_part-----------0(1 row)postgres=# Select Extract (Epoch from ' 1970-01-01 00:00:01 ':: timestamp);Date_part-----------1(1 row)postgres=# Select Extract (Epoch from now ()-' 2013-07-01 ':: timestamp);Date_part----------------193

Ubuntu running Python connection PG, error Importerror:no module named PSYCOPG2[Email protected]:~# python/home/zxw/pgwritertest_m.pyTraceback (most recent):File "/home/zxw/pgwritertest_m.py", line 4, Import PSYCOPG2Importerror:no module named PSYCOPG2For example, the following installation:1[Email protected]:~# apt-cache Search PSYCOPG2Python-psycopg2-python Module for PostgreSQLPython-psycopg2-dbg-python Module for PostgreSQL (debug extension)Python

Ubuntu running Python connection PG, error Importerror:no module named PSYCOPG2[Email protected]:~# python/home/zxw/pgwritertest_m.pyTraceback (most recent):File "/home/zxw/pgwritertest_m.py", line 4, Import PSYCOPG2Importerror:no module named PSYCOPG2Install as follows:1[Email protected]:~# apt-cache Search PSYCOPG2Python-psycopg2-python Module for PostgreSQLPython-psycopg2-dbg-python Module for PostgreSQL (debug extension)Python-psycopg2-doc-python

Update_flag is 1 Notice:the Update_flag is 2 Notice:the Update_flag is 3 Notice:the Update_flag is 4 Notice:the Update_flag is 5 Notice:the Update_flag is 6 Notice:the Update_flag is 7 Notice:the Update_flag is 8 Notice:the Update_flag is 9 Notice:the Update_flag is 10 Fun_employee -------------- 0 (1 row) --5 Test Fun_employee_for_update () Skytf=> select Fun_employee_for_update (); Notice:the Update_flag is 1 Notice:the Update_flag is 2 Notice:the Update_flag is 3 Notice:the Update_flag i

Put some ideas into the PPT: 1. The main is how SQL can be distributed under the Map-reduce framework: it may need to be parsed into Map-phrase SQL and reduce-phrase sql 2. How PG modifies the Analyse_rewrite and planner interfaces 3. How to integrate Hadoop and PG are designed with the least amount of development, with no undue consideration for performance efficiency, with the aim of being as SQL comp

Yum-y install gcc make readline zlib readline-devel zlib-develTAR-JXVF postgresql-9.5.2.tar.bz2CD postgresql-9.5.2Groupadd PostgresUseradd-g Postgres Postgresecho "dbking588" | passwd--stdin Postgres./configure--prefix=/opt/pg952Gmake WorldGmake Install-worldChown-r postgres:postgres/opt/pg952/echo "Export pg_home=/opt/pg952" >>/home/postgres/.bash_profileecho "Export Pg_data=/opt/pg952/data" >>/home/postgres/.bash_profileecho "Export ld_library_path= $PG