postgresql optimization

: There are various types of xlog records (for example, Heap,btree,clog,storage,gin, and Standby records, just to name a few).Xlog Records Backward links. This way, each entry points to the previous entry in the file. In this way, we can fully believe that we have found the end of the record as long as we want to point to the pointer to the previous entry.make XLOG with certaintyAs you can see, a change could trigger many xlog entries. This is true for all kinds of statements, such as a large DE

-time reads and writes Postgis-spatial and geographic objects for PostgreSQL Pg_paxos-basic implementation of Paxos and paxos-based table replication for a cluster of PostgreSQL nodes Optimization Pghero-postgres Insights Made Easy Pgtune-postgresql Configuration Wizard Utilities

Manual PostgreSQL database initialization tutorial in windows, initialize postgresql Environment: win7 64 sp1PG: 9.3.5 1. Create the postgres user, and the password is also postgres: net user postgres postgres /add 2. Create a data directory under the root directory of the database: C:\Program Files\PostgreSQL\9.3>md data 3. Remove the administrator permission on

PostgreSQL tutorial (13): database management details, postgresql details I. Overview: A database can be considered as a name set of an SQL object (database object). Generally, each database object (table, function, etc.) belongs to only one database. However, for some system tables, such as pg_database, it belongs to the entire cluster. More accurately, a database is a set of patterns, and a schema contain

to re-compile and run it. Online debugging cannot be performed during running, but logs can only be played. In view of the above problems, we finally gave up. However, if you use gdb for debugging in linux, you cannot hold it. So use eclipse. Reference: http://wiki.postgresql.org/wiki/Working_with_Eclipse [1] My system environment: Centos6.4 _ x64 Gcc.4.4.7 Eclipse-c/c ++ kepler Postgresql 9.3 The following is my configuration process:1. install ne

PostgreSQL tutorial (18): client commands (2), postgresql tutorial VII. pg_dump: Pg_dump is a tool used to back up PostgreSQL databases. It can even perform a full and consistent backup when the database is being used concurrently without blocking access to the database by other users. The dump format generated by this tool can be divided into two types: script a

From: http://bbs.chinaunix.net/thread-1688208-1-1.html Features MySQL PostgreSQL Instance Run the MySQL Command (mysqld) to start the instance. One instance can manage one or more databases. One server can run multiple mysqld instances. An instance manager can monitor various instances of mysqld. Start the instance by executing the postmaster process (pg_ctl. One instance can manage one or more databases, which

Postgresql C/C ++ API and postgresql sqlapi 1. postgresql learning uri recommendation http://www.php100.com/manual/PostgreSQL8/ http://www.php100.com/manual/PostgreSQL8/reference.html http://www.yiibai.com/html/postgresql/ [Note tips byRuiy, distinguish uri/url, service/server,There has a certain truthChillax!] Frie

the transaction starts). Set the isolation level at the transaction level using the SET TRANSACTION statement. Use set session to set at the session level. MySQL's disadvantage relative to PostgreSQL: Mysql PostgreSQL The most important engine InnoDB is very early in the control of Oracle Corporation. Currently, the entire MySQL database is controlled by Oracle.

see results submitted before the transaction starts). Set the isolation level at the transaction level using the SET TRANSACTION statement. Use set session to set at the session level. MySQL's disadvantage relative to PostgreSQL: Mysql PostgreSQL The most important engine InnoDB is very early in the control of Oracle Corporation. Currently, the entire MySQL databas

Tutorial on installing and using the extension module on PostgreSQL, postgresql extension module Installation Module Note: My runtime environments are Ubuntu 10.04 and PostgreSQL 8.4. First, install the postgresql-contrib package and restart the database server. Then, check the contrib directory to see if there are som

PostgreSQL tutorial (1): Detailed description of data tables and detailed description of postgresql I. Table definition: For any relational database, tables are the core and basic object units of data storage. Now let's start from here.1. Create a table:Copy codeThe Code is as follows:Create table products (Product_no integer,Name text,Price numeric);2. delete a table:Copy codeThe Code is as follows:Drop ta

PostgreSQL replication cluster overview, PostgreSQL replication Cluster For pg replication, high availability, and load balancing clusters, write an overview for future reference. Pg has the following various replication-Based Cluster solutions, most of which were used, and some were not sorted out at the time. There are also many cluster configuration documents on the Internet. After this document, find a

Mac installs PostgreSQL by default, so that PostgreSQL can be accessed remotelyMac default PostgreSQL directory storage path is /usr/local/var/postgres/ in this directory, modify two files, one is postgresql.conf, one is pg_ Hba.conf, and finally a reboot.Modify Postresql.conflisten_addresses = ' * ' # Modify the configuration here to allow link

-n "Starting PostgreSQL :"Test x "$ OOM_ADJ "! = X echo "$ OOM_ADJ">/proc/self/oom_adjSu-$ PGUSER-c "$ DAEMON-D $ PGDATA " >>$ PGLOG 2> 1Echo "OK";;Stop)Echo-n "Stopping PostgreSQL :"Su-$ PGUSER-c "$ PGCTL stop-D '$ PGDATA'-s-m fast"Echo "OK";;Restart)Echo-n "Restarting PostgreSQL :"Su-$ PGUSER-c "$ PGCTL stop-D '$ PGDATA'-s-m fast-w"Test x "$ OOM_ADJ "! = X e

MySQL's disadvantage relative to PostgreSQL: Mysql PostgreSQL The most important engine InnoDB is very early in the control of Oracle Corporation. Currently, the entire MySQL database is controlled by Oracle. The BSD protocol was not monopolized by big companies. Weak processing of complex queries, the query optimizer is not mature enough Very powerfu

PostgreSQL tutorial (10): Performance Improvement tips and postgresql Performance Improvement 1. Use EXPLAIN: PostgreSQL generates a query plan for each query, because selecting the correct query path has a critical impact on performance. PostgreSQL itself contains a scheduler for optimal planning. We can use the EXPLA

this post was last edited by osdba on 2011-04-21 16:33 Characteristics Mysql PostgreSQL Instance Launch the instance by executing the MySQL command (MYSQLD). One instance can manage one or more databases. A single server can run multiple mysqld instances. An instance manager can monitor individual instances of mysqld. Launch the instance by executing the Po

From: http://blog.csdn.net/lengzijian/article/details/8252270   I don't want to explain the installation and use of pgfincore too much. I just want to record my usage experience. If you want to read more, please refer to the following content:

PostgreSQL tutorial (8): Index details, postgresql Index I. Index type: PostgreSQL provides multiple index types: B-Tree, Hash, GiST, and GIN. Because they use different algorithms, each index type has a suitable Query type, the create index Command creates a B-Tree INDEX.1. B-Tree:Copy codeThe Code is as follows:Create table test1 (Id integer,Content varchar);Cr