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README
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@ -1,42 +0,0 @@
###############################################
PostgreSQL Module
###############################################
Maintainer Contact
-----------------------------------------------
Geoff Munn (Nickname: gmunn)
<geoff (at) silverstripe (dot) com>
Requirements
-----------------------------------------------
- PostgreSQL 8.3.x or greater must be installed
- PostgreSQL <8.3.0 may work if T-Search is manually installed
- Known to work on OS X Leopard, Windows Server 2008 R2 and Linux
Documentation
-----------------------------------------------
http://doc.silverstripe.org/doku.php?id=postgres
Installation Instructions
-----------------------------------------------
Move the 'postgres' folder to the root level of the project.
You'll need to create a database with the desired name manually.
Run dev/build and you should be set.
Usage Overview
-----------------------------------------------
See the documentation link for examples of PostgreSQL-specific functionality.
Known issues:
-----------------------------------------------
All column and table names must be double-quoted. PostgreSQL automatically lower-cases columns, and your queries will fail if you don't.
Ts_vector columns are not automatically detected by the built-in search filters.
That means if you're doing a search through the CMS on a ModelAdmin object, it will use LIKE queries which are very slow.
If you're writing your own front-end search system, you can specify the columns to use for search purposes, and you get the full benefits of T-Search.
If you are using unsupported modules, there may be instances of MySQL-specific SQL queries which will need to be made database-agnostic where possible.

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# PostgreSQL Module Module
## Maintainer Contact
* Sam Minnee (Nickname: sminnee) <sam@silverstripe.com>
## Requirements
* SilverStripe 2.4
* PostgreSQL 8.3.x or greater must be installed
* PostgreSQL <8.3.0 may work if T-Search is manually installed
* Known to work on OS X Leopard, Windows Server 2008 R2 and Linux
## Documentation
Move the 'postgresql' folder to the root level of the project. You'll need to
create a database with the desired name manually.
Run dev/build and you should be set.
## Usage Overview
See docs/en for more information about configuring the module.
## Known issues
All column and table names must be double-quoted. PostgreSQL automatically
lower-cases columns, and your queries will fail if you don't.
Ts_vector columns are not automatically detected by the built-in search
filters. That means if you're doing a search through the CMS on a ModelAdmin
object, it will use LIKE queries which are very slow. If you're writing your
own front-end search system, you can specify the columns to use for search
purposes, and you get the full benefits of T-Search.
If you are using unsupported modules, there may be instances of MySQL-specific
SQL queries which will need to be made database-agnostic where possible.

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# PostgreSQL Database Module
SilverStripe now has tentative support for PostgreSQL ('Postgres') which is available though this module
SilverStripe now has tentative support for PostgreSQL ('Postgres').
## Requirements
SilverStripe 2.4.0 or greater. (PostgreSQL support is NOT available in 2.3.)
SilverStripe 2.4.0 or greater. (PostgreSQL support is NOT available
in 2.3.).
SilverStripe supports Postgres versions 8.3.x, 8.4.x and onwards. Postgres 8.3.0 launched in February 2008, so SilverStripe has a fairly modern but not bleeding edge Postgres version requirement.
SilverStripe supports Postgres versions 8.3.x, 8.4.x and onwards.
Postgres 8.3.0 launched in February 2008, so SilverStripe has a fairly
modern but not bleeding edge Postgres version requirement.
Support for 8.2.x is theoretically possible if you're willing to manually install T-search. 8.2.x has not been tested either, so there may be other compatibility issues. The EnterpriseDB versions of Postgres also work, if you'd prefer a tuned version.
Support for 8.2.x is theoretically possible if you're willing to manually
install T-search. 8.2.x has not been tested either, so there may be other
compatibility issues. The EnterpriseDB versions of Postgres also work, if
you'd prefer a tuned version.
## Installation
@ -16,21 +22,31 @@ You have three options to install PostgreSQL support with SilverStripe.
### Option 1 - Installer
The first option is to use the installer. However, this is currently only supported since SilverStripe 2.4.0 beta2 (or using the daily builds).
The first option is to use the installer. However, this is currently only
supported since SilverStripe 2.4.0 beta2 (or using the daily builds).
1. Set up SilverStripe somewhere where you can start the installer - you should only see one database “MySQL” to install with
2. Download a copy of the “postgresql” module from here: http://silverstripe.org/postgresql-module
3. Extract the archive you downloaded. Rename the directory from “postgresql-trunk-rxxxx” to “postgresql” and copy it into the SilverStripe directory you just set up
4. Open the installer once again, and a new option “PostgreSQL” should appear. You can now proceed through the installation without having to change any code.
1. Set up SilverStripe somewhere where you can start the installer - you
should only see one database “MySQL” to install with.
2. Download a copy of the “postgresql” module from here:
http://silverstripe.org/postgresql-module
3. Extract the archive you downloaded. Rename the directory from
“postgresql-trunk-rxxxx” to “postgresql” and copy it into the SilverStripe
directory you just set up
4. Open the installer once again, and a new option “PostgreSQL” should appear.
You can now proceed through the installation without having to change any code.
### Option 2 - Manual
The second option is to setup PostgreSQL support manually. This can be achieved by following these instructions:
The second option is to setup PostgreSQL support manually. This can be achieved
by following these instructions:
1. Set up a fresh working copy of SilverStripe
2. Download a copy of the “postgresql” module from here: http://silverstripe.org/postgresql-module
3. Extract the archive you downloaded. Rename the directory from “postgresql-trunk-rxxxx” to “postgresql” and copy it into the SilverStripe directory you just set up
4. Open up your mysite/_config.php file and add (or update) the $databaseConfig array like so:
3. Extract the archive you downloaded. Rename the directory from
“postgresql-trunk-rxxxx” to “postgresql” and copy it into the SilverStripe
directory you just set up.
4. Open up your mysite/_config.php file and add (or update) the $databaseConfig
array like so:
> $databaseConfig = array(
> 'type' => 'PostgreSQLDatabase',
@ -40,27 +56,35 @@ The second option is to setup PostgreSQL support manually. This can be achieved
> 'database' => 'SS_mysite'
> );
Finally, visit dev/build so that SilverStripe can build the database schema and default records.
Finally, visit dev/build so that SilverStripe can build the database schema and
default records.
### Option 3 - Environment file
Finally, the third option is to change your environment to point to PostgreSQLDatabase as a database class. Do this if you're currently using an _ss_environment.php file.
Finally, the third option is to change your environment to point to
PostgreSQLDatabase as a database class. Do this if you're currently using an
_ss_environment.php file.
1. Download a copy of the “postgresql” module from here: http://silverstripe.org/postgresql-module
2. Extract the archive you downloaded. Rename the directory from “postgresql-trunk-rxxxx” to “postgresql” and copy it into your SS directory
2. Extract the archive you downloaded. Rename the directory from
postgresql-trunk-rxxxx” to “postgresql” and copy it into your SS directory
3. Add the following to your existing _ss_environment.php file:
> define('SS_DATABASE_CLASS', 'PostgreSQLDatabase');
Last steps:
1. Ensure your SS_DATABASE_USERNAME and SS_DATABASE_PASSWORD defines in _ss_environment.php are correct to the PostgreSQL server
2. Ensure that your mysite/_config.php file has a database name defined, such as “SS_mysite”
3. Visit dev/build so that SilverStripe can build the database schema and default records
1. Ensure your SS_DATABASE_USERNAME and SS_DATABASE_PASSWORD defines in
_ss_environment.php are correct to the PostgreSQL server.
2. Ensure that your mysite/_config.php file has a database name defined, such
as “SS_mysite”.
3. Visit dev/build so that SilverStripe can build the database schema and
default records
## Features
Here is a quick list of what's different in the Postgres module (a full description follows afterwards):
Here is a quick list of what's different in the Postgres module (a full
description follows afterwards):
* T-Search
* Extended index support
@ -70,26 +94,41 @@ Here is a quick list of what's different in the Postgres module (a full descript
* Tablespaces
* Index clustering
If you don't know much about databases, or don't want to use any of the advanced features that this module provides, then you don't need to read any further.
If you don't know much about databases, or don't want to use any of the
advanced features that this module provides, then you don't need to read
any further.
The use of any of these features, especially the advanced options, implies that you have some level of comfort in administrating a Postgres database.
The use of any of these features, especially the advanced options, implies
that you have some level of comfort in administrating a Postgres database.
### T-Search
T-Search support is provided via both GiST and GIN. You can cluster and search columns with combinations of these methods. It is up to you to decide which is most appropriate for your data.
T-Search support is provided via both GiST and GIN. You can cluster and
search columns with combinations of these methods. It is up to you to
decide which is most appropriate for your data.
The dev/build process automatically creates a special column on each table, and a trigger is automatically set up to update this column whenever the targeted columns are changed. T-Search uses this column to return matches for search criteria.
The dev/build process automatically creates a special column on each table,
and a trigger is automatically set up to update this column whenever the
targeted columns are changed. T-Search uses this column to return matches
for search criteria.
Please see tutorial 4 for information how to enable fulltext search and the necessary controller hooks.
Please see tutorial 4 for information how to enable fulltext search and the
necessary controller hooks.
### Extended index support
Indexes have been extended to include support for more options. These new options include:
Indexes have been extended to include support for more options. These new
options include:
* The ability to specify index methods (btree/hash/). Btree is probably fine nearly all indexes, and it is the default. 'Unique' is also supported.
* Partial indexes. This is especially handy for creating an index while ignoring nulls or default data.
* Multiple column indexing. If your WHERE clauses always use the same columns, then you can create one index covering all of these at once.
* Fill factor. If your table content is static, then you can reduce the physical disk space your index uses. Also, if you use clustering, giving the fillfactor a low number may help performance for updates.
* The ability to specify index methods (btree/hash/). Btree is probably
fine nearly all indexes, and it is the default. 'Unique' is also supported.
* Partial indexes. This is especially handy for creating an index while i
gnoring nulls or default data.
* Multiple column indexing. If your WHERE clauses always use the same
columns, then you can create one index covering all of these at once.
* Fill factor. If your table content is static, then you can reduce the
physical disk space your index uses. Also, if you use clustering, giving the
fillfactor a low number may help performance for updates.
Examples:
@ -113,7 +152,8 @@ Examples:
### Array data types
Nearly all data types in SilverStripe can now be expressed as an array. For example, you can specify an int as this:
Nearly all data types in SilverStripe can now be expressed as an array. For
example, you can specify an int as this:
> $db = array (
> 'Quantity'=>'Int[]'
@ -123,26 +163,34 @@ You would populate this like so:
> $item->Quantity='Array[1,2,3...]';
It also takes object literals if you're more familiar with that or it suits your purpose better, like this:
It also takes object literals if you're more familiar with that or it suits
your purpose better, like this:
> $item->Quantity='{1,2,3}';
Using arrays as data types means that you can avoid join tables. This is not recommended if the SilverStripe ORM would expect a has_one or has_many etc under normal circumstances, but it could be useful in the case where you have a very large join table. You can also index these arrays with GIN indexes.
Using arrays as data types means that you can avoid join tables. This is not
recommended if the SilverStripe ORM would expect a has_one or has_many etc under
normal circumstances, but it could be useful in the case where you have a very
large join table. You can also index these arrays with GIN indexes.
Please consult the official Postgres documentation for more information.
### Transactions
Transactions are supported at the database connection level. The relevant functions are:
Transactions are supported at the database connection level. The relevant
functions are:
* DB::getConn()→startTransaction($transaction_mode, $session_characteristics)
* DB::getConn()→transactionSavepoint($name)
* DB::getConn()→transactionRollback($savepoint)
* DB::getConn()→endTransaction();
You can create a savepoint by passing a name to the function, and then rollback either all of the uncommited transactions, or if you pass a savepoint name, jump back to the point you'd prefer.
You can create a savepoint by passing a name to the function, and then rollback
either all of the uncommited transactions, or if you pass a savepoint name,
jump back to the point you'd prefer.
$transaction_mode and $session_characteristic take the full range of isolation levels supported by Postgres.
$transaction_mode and $session_characteristic take the full range of isolation
levels supported by Postgres.
Please consult the official Postgres documentation for more information.
@ -150,7 +198,9 @@ Please consult the official Postgres documentation for more information.
**This is an experimental feature.**
If you have a very large table, you can split it into many child tables. The advantages of this depend on your particular situation. Generally speaking, if your table is very large, queries should be faster.
If you have a very large table, you can split it into many child tables. The
advantages of this depend on your particular situation. Generally speaking,
if your table is very large, queries should be faster.
You can create a partitioned table like this:
@ -163,7 +213,8 @@ You can create a partitioned table like this:
'NEW.' is a required part of the configuration string.
Partitioning should be set up right from the beginning. Partitioning a table which already has data may have unpredictable results.
Partitioning should be set up right from the beginning. Partitioning a table
which already has data may have unpredictable results.
Please consult the official Postgres documentation for more information.
@ -171,15 +222,21 @@ Please consult the official Postgres documentation for more information.
**This is an experimental feature.**
Tablespaces are good for moving the physical files to a faster device (or slower and less used if that's a better option). You can set up a tablespace like this:
Tablespaces are good for moving the physical files to a faster device (or slower
and less used if that's a better option). You can set up a tablespace like this:
> public static $database_extensions = array(
> 'tablespace'=>Array('name'=>'fastspace', 'location'=>'/faster_location'),
> );
The '/faster_location' path must be owned by the postgres user. If you try to delete a tablespace via the 'drop tablespace' command, then this directory must be empty.
The '/faster_location' path must be owned by the postgres user. If you try to
delete a tablespace via the 'drop tablespace' command, then this directory must
be empty.
Changing the location of the tablespace through the SilverStripe $database_extensions array will cause the dev/build process to attempt to delete the old location. An error message will be displayed if this location is not empty.
Changing the location of the tablespace through the SilverStripe
$database_extensions array will cause the dev/build process to attempt to delete
the old location. An error message will be displayed if this location is not
empty.
Please consult the official Postgres documentation for more information.
@ -187,32 +244,49 @@ Please consult the official Postgres documentation for more information.
**This is an experimental feature.**
Index clustering allows you to reorganise the way rows are ordered inside a table according to an index specification. This can be a very intensive disk operation. You specify an index cluster like this:
Index clustering allows you to reorganise the way rows are ordered inside a
table according to an index specification. This can be a very intensive disk
operation. You specify an index cluster like this:
> public static $database_extensions = array(
> 'cluster'=>'index_name'
> );
Clustering is only applied on a table on the second instance of a dev/build command being run on it (running a cluster command on an empty table is pointless).
Clustering is only applied on a table on the second instance of a dev/build
command being run on it (running a cluster command on an empty table is
pointless).
Clustering needs to be reapplied on a regular basis if you're updating this table. You can also decrease the fillfactor on that index as well for potential performance gains.
Clustering needs to be reapplied on a regular basis if you're updating this
table. You can also decrease the fillfactor on that index as well for
potential performance gains.
As an alternative, clustering isn't necessary if you rebuild a table with an ORDER BY clause, where the ORDER BY column is the same as what you'd be clustering it by. The dev/build process does not do table rebuilds, so this is something you'd have to do yourself.
As an alternative, clustering isn't necessary if you rebuild a table with
an ORDER BY clause, where the ORDER BY column is the same as what you'd be
clustering it by. The dev/build process does not do table rebuilds, so this
is something you'd have to do yourself.
Please consult the official Postgres documentation for more information.
**A note about these advanced features**
The advanced features are here as an experimental offering. They have not been fully tested and their functionality and purpose may change in the future. They are primarily here to offer the ability to handle very large datasets.
The advanced features are here as an experimental offering. They have not
been fully tested and their functionality and purpose may change in the
future. They are primarily here to offer the ability to handle very large
datasets.
They are also features which require the user to be very familiar with both Postgres and how their data works. If you can't predict how your database will be populated, then most of these features will be of little use.
They are also features which require the user to be very familiar with both
Postgres and how their data works. If you can't predict how your database
will be populated, then most of these features will be of little use.
## User contributed information
**Provided by dompie**
If you want to install this on a more secure postgresql server, go to PostgreSQLDatabase.php and set "public static $check_database_exists = false;"
Moreover you have to replace in PostgreSQLDatabaseConfigurationHelper.php occourences of
If you want to install this on a more secure postgresql server, go to
PostgreSQLDatabase.php and set "public static $check_database_exists = false;"
Moreover you have to replace in PostgreSQLDatabaseConfigurationHelper.php
occurrences of
> $connstring = "host=$server port=5432 dbname=postgres {$userPart}{$passwordPart}";
@ -222,19 +296,26 @@ with
> $connstring = "host=$server port=5432 dbname=$dbname {$userPart}{$passwordPart}";
Otherwise this extension will try to connect to "postgres" Database to check DB connection, no matter what you entered in the "Database Name" field during installation.
Otherwise this extension will try to connect to "postgres" Database to check DB
connection, no matter what you entered in the "Database Name" field during
installation.
Make sure you have set the "search_path" correct for your database user.
## Known Issues
All column and table names must be double-quoted. PostgreSQL automatically lower-cases columns, and your queries will fail if you don't.
All column and table names must be double-quoted. PostgreSQL automatically
lower-cases columns, and your queries will fail if you don't.
Ts_vector columns are not automatically detected by the built-in search filters.
That means if you're doing a search through the CMS on a ModelAdmin object, it will use LIKE queries which are very slow.
If you're writing your own front-end search system, you can specify the columns to use for search purposes, and you get the full benefits of T-Search.
That means if you're doing a search through the CMS on a ModelAdmin object, it
will use LIKE queries which are very slow.
If you are using unsupported modules, there may be instances of MySQL-specific SQL queries which will need to be made database-agnostic where possible.
If you're writing your own front-end search system, you can specify the columns
to use for search purposes, and you get the full benefits of T-Search.
If you are using unsupported modules, there may be instances of MySQL-specific
SQL queries which will need to be made database-agnostic where possible.

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@ -0,0 +1,321 @@
# PostgreSQL Database Module
SilverStripe now has tentative support for PostgreSQL ('Postgres').
## Requirements
SilverStripe 2.4.0 or greater. (PostgreSQL support is NOT available
in 2.3.).
SilverStripe supports Postgres versions 8.3.x, 8.4.x and onwards.
Postgres 8.3.0 launched in February 2008, so SilverStripe has a fairly
modern but not bleeding edge Postgres version requirement.
Support for 8.2.x is theoretically possible if you're willing to manually
install T-search. 8.2.x has not been tested either, so there may be other
compatibility issues. The EnterpriseDB versions of Postgres also work, if
you'd prefer a tuned version.
## Installation
You have three options to install PostgreSQL support with SilverStripe.
### Option 1 - Installer
The first option is to use the installer. However, this is currently only
supported since SilverStripe 2.4.0 beta2 (or using the daily builds).
1. Set up SilverStripe somewhere where you can start the installer - you
should only see one database “MySQL” to install with.
2. Download a copy of the “postgresql” module from here:
http://silverstripe.org/postgresql-module
3. Extract the archive you downloaded. Rename the directory from
“postgresql-trunk-rxxxx” to “postgresql” and copy it into the SilverStripe
directory you just set up
4. Open the installer once again, and a new option “PostgreSQL” should appear.
You can now proceed through the installation without having to change any code.
### Option 2 - Manual
The second option is to setup PostgreSQL support manually. This can be achieved
by following these instructions:
1. Set up a fresh working copy of SilverStripe
2. Download a copy of the “postgresql” module from here: http://silverstripe.org/postgresql-module
3. Extract the archive you downloaded. Rename the directory from
“postgresql-trunk-rxxxx” to “postgresql” and copy it into the SilverStripe
directory you just set up.
4. Open up your mysite/_config.php file and add (or update) the $databaseConfig
array like so:
> $databaseConfig = array(
> 'type' => 'PostgreSQLDatabase',
> 'server' => '[server address e.g. localhost]',
> 'username' => 'postgres',
> 'password' => 'mypassword',
> 'database' => 'SS_mysite'
> );
Finally, visit dev/build so that SilverStripe can build the database schema and
default records.
### Option 3 - Environment file
Finally, the third option is to change your environment to point to
PostgreSQLDatabase as a database class. Do this if you're currently using an
_ss_environment.php file.
1. Download a copy of the “postgresql” module from here: http://silverstripe.org/postgresql-module
2. Extract the archive you downloaded. Rename the directory from
postgresql-trunk-rxxxx” to “postgresql” and copy it into your SS directory
3. Add the following to your existing _ss_environment.php file:
> define('SS_DATABASE_CLASS', 'PostgreSQLDatabase');
Last steps:
1. Ensure your SS_DATABASE_USERNAME and SS_DATABASE_PASSWORD defines in
_ss_environment.php are correct to the PostgreSQL server.
2. Ensure that your mysite/_config.php file has a database name defined, such
as “SS_mysite”.
3. Visit dev/build so that SilverStripe can build the database schema and
default records
## Features
Here is a quick list of what's different in the Postgres module (a full
description follows afterwards):
* T-Search
* Extended index support
* Array data types
* Transactions
* Table partitioning
* Tablespaces
* Index clustering
If you don't know much about databases, or don't want to use any of the
advanced features that this module provides, then you don't need to read
any further.
The use of any of these features, especially the advanced options, implies
that you have some level of comfort in administrating a Postgres database.
### T-Search
T-Search support is provided via both GiST and GIN. You can cluster and
search columns with combinations of these methods. It is up to you to
decide which is most appropriate for your data.
The dev/build process automatically creates a special column on each table,
and a trigger is automatically set up to update this column whenever the
targeted columns are changed. T-Search uses this column to return matches
for search criteria.
Please see tutorial 4 for information how to enable fulltext search and the
necessary controller hooks.
### Extended index support
Indexes have been extended to include support for more options. These new
options include:
* The ability to specify index methods (btree/hash/). Btree is probably
fine nearly all indexes, and it is the default. 'Unique' is also supported.
* Partial indexes. This is especially handy for creating an index while i
gnoring nulls or default data.
* Multiple column indexing. If your WHERE clauses always use the same
columns, then you can create one index covering all of these at once.
* Fill factor. If your table content is static, then you can reduce the
physical disk space your index uses. Also, if you use clustering, giving the
fillfactor a low number may help performance for updates.
Examples:
**Hash index**:
> public static $indexes = array(
> 'Address'=>Array('type'=>'hash', 'name'=>'Address'),
> );
**Where clause**:
> public static $indexes = array(
> 'Address'=>Array('type'=>'unique', 'name'=>'Address', 'where'=>"\"Address\" IS NOT NULL"),
> );
**Fill factor**:
> public static $indexes = array(
> 'Address'=>Array('type'=>'unique', 'name'=>'Address', 'fillfactor'=>'50'),
> );
### Array data types
Nearly all data types in SilverStripe can now be expressed as an array. For
example, you can specify an int as this:
> $db = array (
> 'Quantity'=>'Int[]'
> )
You would populate this like so:
> $item->Quantity='Array[1,2,3...]';
It also takes object literals if you're more familiar with that or it suits
your purpose better, like this:
> $item->Quantity='{1,2,3}';
Using arrays as data types means that you can avoid join tables. This is not
recommended if the SilverStripe ORM would expect a has_one or has_many etc under
normal circumstances, but it could be useful in the case where you have a very
large join table. You can also index these arrays with GIN indexes.
Please consult the official Postgres documentation for more information.
### Transactions
Transactions are supported at the database connection level. The relevant
functions are:
* DB::getConn()→startTransaction($transaction_mode, $session_characteristics)
* DB::getConn()→transactionSavepoint($name)
* DB::getConn()→transactionRollback($savepoint)
* DB::getConn()→endTransaction();
You can create a savepoint by passing a name to the function, and then rollback
either all of the uncommited transactions, or if you pass a savepoint name,
jump back to the point you'd prefer.
$transaction_mode and $session_characteristic take the full range of isolation
levels supported by Postgres.
Please consult the official Postgres documentation for more information.
### Table Partitioning
**This is an experimental feature.**
If you have a very large table, you can split it into many child tables. The
advantages of this depend on your particular situation. Generally speaking,
if your table is very large, queries should be faster.
You can create a partitioned table like this:
> public static $database_extensions = array(
> 'partitions'=>array(
> 'child_table_1'=>'NEW."ID">0 AND NEW."ID"<=100',
> 'child_table_2'=>'NEW."ID">100 AND NEW."ID"<=200'
> )
> );
'NEW.' is a required part of the configuration string.
Partitioning should be set up right from the beginning. Partitioning a table
which already has data may have unpredictable results.
Please consult the official Postgres documentation for more information.
### Tablespaces
**This is an experimental feature.**
Tablespaces are good for moving the physical files to a faster device (or slower
and less used if that's a better option). You can set up a tablespace like this:
> public static $database_extensions = array(
> 'tablespace'=>Array('name'=>'fastspace', 'location'=>'/faster_location'),
> );
The '/faster_location' path must be owned by the postgres user. If you try to
delete a tablespace via the 'drop tablespace' command, then this directory must
be empty.
Changing the location of the tablespace through the SilverStripe
$database_extensions array will cause the dev/build process to attempt to delete
the old location. An error message will be displayed if this location is not
empty.
Please consult the official Postgres documentation for more information.
### Index Clustering
**This is an experimental feature.**
Index clustering allows you to reorganise the way rows are ordered inside a
table according to an index specification. This can be a very intensive disk
operation. You specify an index cluster like this:
> public static $database_extensions = array(
> 'cluster'=>'index_name'
> );
Clustering is only applied on a table on the second instance of a dev/build
command being run on it (running a cluster command on an empty table is
pointless).
Clustering needs to be reapplied on a regular basis if you're updating this
table. You can also decrease the fillfactor on that index as well for
potential performance gains.
As an alternative, clustering isn't necessary if you rebuild a table with
an ORDER BY clause, where the ORDER BY column is the same as what you'd be
clustering it by. The dev/build process does not do table rebuilds, so this
is something you'd have to do yourself.
Please consult the official Postgres documentation for more information.
**A note about these advanced features**
The advanced features are here as an experimental offering. They have not
been fully tested and their functionality and purpose may change in the
future. They are primarily here to offer the ability to handle very large
datasets.
They are also features which require the user to be very familiar with both
Postgres and how their data works. If you can't predict how your database
will be populated, then most of these features will be of little use.
## User contributed information
**Provided by dompie**
If you want to install this on a more secure postgresql server, go to
PostgreSQLDatabase.php and set "public static $check_database_exists = false;"
Moreover you have to replace in PostgreSQLDatabaseConfigurationHelper.php
occurrences of
> $connstring = "host=$server port=5432 dbname=postgres {$userPart}{$passwordPart}";
with
> $dbname = $databaseConfig['database']?$databaseConfig['database']: 'postgres';
> $connstring = "host=$server port=5432 dbname=$dbname {$userPart}{$passwordPart}";
Otherwise this extension will try to connect to "postgres" Database to check DB
connection, no matter what you entered in the "Database Name" field during
installation.
Make sure you have set the "search_path" correct for your database user.
## Known Issues
All column and table names must be double-quoted. PostgreSQL automatically
lower-cases columns, and your queries will fail if you don't.
Ts_vector columns are not automatically detected by the built-in search filters.
That means if you're doing a search through the CMS on a ModelAdmin object, it
will use LIKE queries which are very slow.
If you're writing your own front-end search system, you can specify the columns
to use for search purposes, and you get the full benefits of T-Search.
If you are using unsupported modules, there may be instances of MySQL-specific
SQL queries which will need to be made database-agnostic where possible.