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Lock Management Section
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Lock management defines how PostgreSQL handles record lock situations
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deadlock_timeout = 1000
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The PostgreSQL Files and Programs
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This feature defines the time in milliseconds for PostgreSQL to wait for a record lock before checking for a deadlock situation (when two or more processes attempt to access the same record at the same time) If a deadlock situation occurs, PostgreSQL initiates the Multiversion Concurrency Control (MVCC) feature to resolve the deadlock Implementing this feature too early can negatively impact database performance
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max_locks_per_transaction = 64
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This value sets the number of locked records allowed per transaction per client
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The Version/Platform Compatibility section defines how the currently installed PostgreSQL version behaves with previous versions of the software, as well as when working on different platforms
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add_missing_from = off
When this value is enabled, tables referenced by a query are automatically added to the FROM SQL clause if not already present While this behavior is not standard SQL, this feature was present in previous PostgreSQL versions
backslash_quote = safe_encoding
This value controls how the PostgreSQL server handles backslashes in client connections This feature was recently modified due to a security exploit When the feature is disabled (off), statements with backslashes are always rejected When the feature is enabled (on), statements with backslashes are always allowed The default value of safe_encoding allows backslashes if the client also supports an encoding that allows backslashes
default_with_oids = off
This value controls whether a CREATE TABLE or CREATE TABLE AS statement includes an object ID (OID) column by default In PostgreSQL versions previous to 81, this was enabled by default If you reference a table field as a foreign key in another table (see 4), the referenced table must be created with an OID However, not all tables need to be created with an OID column
escape_string_warning = off
When this value is enabled, PostgreSQL writes a warning message to the system log file when a SQL statement contains a backslash character
regex_flavor = advanced sql_inheritance = on
PostgreSQL 8 for Windows
These two features control the behavior of the PostgreSQL system to match previous versions The regex feature changed in PostgreSQL 74 If you need to run applications from a previous version of PostgreSQL, you may need to set this value to either basic or extended The table inheritance feature of PostgreSQL (discussed in 1) changed significantly in version 74 If you need to run applications created in a previous version of PostgreSQL, you will have to disable this feature
transform_null_equals = off
This feature is extremely important if you are accessing your PostgreSQL database from Microsoft Access (see 12) Microsoft Access uses the NULL value in queries somewhat differently than the standard SQL specifications If you are building queries using Access, you will need to enable this feature
Customized Options Section
Finally, as a catchall, PostgreSQL allows you to define your own internal variable classes:
custom_variable_classes = ''
This feature allows you to define new variables for special classes within PostgreSQL A comma-separated list of the new classes must be provided to this feature Variables within the class are identified as classnamevariable This is an advanced feature that is not normally used by PostgreSQL users
The pg_hbaconf File
You can restrict how clients connect to your PostgreSQL system by editing the hostbased authentication configuration file, named pg_hbaconf There are four things you can restrict from this configuration file: Which network hosts are allowed to connect to PostgreSQL Which PostgreSQL usernames can be used to connect from the network What authentication method users must use to log into the system Which PostgreSQL databases an authenticated client can connect to Each line in the pg_hbaconf file contains a separate definition (record) controlling access to the system Multiple records can be created to define different access types and categories to the system For a remote client to gain access to the PostgreSQL system, the conditions of at least one record must be met If multiple records match a specific client, only the first matching record in the configuration file is used for authentication The format of a pg_hbaconf record is
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