The PostgreSQL Files and Programs in .NET

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The PostgreSQL Files and Programs
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bgwriter_lru_maxpages = 5 The maximum number of buffers that can be written in one background writer process Left over buffers are saved for the next background writer process run bgwriter_all_percent = 0333 The percentage of the entire buffer pool examined in one background writer process This value states that one-third of the buffer pool will be examined during each background writer process, so the entire pool will be examined every three runs bgwriter_all_maxpages = 5 The maximum number of buffers from the entire buffer pool that can be examined in one background writer process
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Write Ahead Log Section
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The Write Ahead Log (WAL) feature allows PostgreSQL to submit transactions to the transaction log before they are processed in the database This provides for a more stable environment where all transactions are recoverable in case of a database crash The transaction log is guaranteed to contain the transactions performed on the database data, even if the database crashes before a transaction is committed to the database The transaction logs are created as files (called segments) that are stored in the pg_xlog directory of the database cluster area
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fsync = on
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This feature ensures that each individual transaction is written to disk immediately instead of being stored in the WAL Keeping this feature enabled results in decreased database performance, but ensures data durability and security Disabling this feature allows multiple transactions to accumulate in the WAL transaction log files before being written to disk
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wal_sync_method = fsync
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This value determines the method PostgreSQL uses to write data to disk This value is set by the PostgreSQL installer and is optimized for the operating system that PostgreSQL is installed on The other values listed under this feature in the configuration file are used for other operating systems that PostgreSQL can run on You do not need to change these values for a Windows environment
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full_page_writes = on
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Determines if PostgreSQL writes data to the WAL transaction log files based on a single database record or an entire page of records
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wal_buffers = 8
The number of 8124-byte disk page buffers allocated in shared memory for the WAL
commit_delay = 0
PostgreSQL 8 for Windows
The delay in microseconds between when PostgreSQL writes a committed record to the WAL and when it writes the WAL log files to the database If the value is larger than 0, PostgreSQL can write multiple transactions that occur during that timeframe to disk in one process
commit_siblings = 5
The minimum number of open concurrent transactions before starting the commit_ delay timer
checkpoint_segments = 3
The maximum number of 16MB log file segments between writing the WAL log files to the database Checkpoints are points in the transaction process when PostgreSQL stores all of the data in the WAL to disk After the checkpoint, it is guaranteed that the data in the WAL is safely in the database files This value means that for every three segments (48MB) of data, PostgreSQL will force the WAL to be saved to disk
checkpoint_timeout = 300
The time in seconds between writing the WAL to the database If the checkpoint_ segment value hasn t been met within this timeframe, the WAL is written to disk
checkpoint_warning = 30
PostgreSQL writes a message to the system log file if the WAL segment files get filled within the defined value (in seconds)
archive_command = ''
The archive_command feature allows you to define a system command to copy (archive) WAL files to another location on the server for additional backup In a highavailability production environment, you can configure PostgreSQL to copy the WAL files to an alternative location (usually on a separate physical disk) This is covered in more detail in 10
Query Tuning Section
PostgreSQL allows you to fine-tune how it handles database queries PostgreSQL attempts to optimize all database queries You can control the methods PostgreSQL uses to optimize queries using these features Query performance is discussed in detail in 10, but nonetheless, here are the features associated with this function:
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