PostgreSQL 8.2.18 Documentation
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# 17.13. Preset Options

The following "parameters" are read-only, and are determined when PostgreSQL is compiled or when it is installed. As such, they have been excluded from the sample `postgresql.conf` file. These options report various aspects of PostgreSQL behavior that may be of interest to certain applications, particularly administrative front-ends.

`block_size` (`integer`)

  Reports the size of a disk block. It is determined by the value of `BLCKSZ` when building the server. The default value is 8192 bytes. The meaning of some configuration variables (such as shared_buffers) is influenced by `block_size`. See Section 17.4 for information.

`integer_datetimes` (`boolean`)

  Reports whether PostgreSQL was built with support for 64-bit-integer dates and times. It is set by configuring with `--enable-integer-datetimes` when building PostgreSQL. The default value is `off`.

`lc_collate` (`string`)

  Reports the locale in which sorting of textual data is done. See Section 21.1 for more information. The value is determined when the database cluster is initialized.

`lc_ctype` (`string`)

  Reports the locale that determines character classifications. See Section 21.1 for more information. The value is determined when the database cluster is initialized. Ordinarily this will be the same as `lc_collate`, but for special applications it might be set differently.

`max_function_args` (`integer`)

  Reports the maximum number of function arguments. It is determined by the value of `FUNC_MAX_ARGS` when building the server. The default value is 100 arguments.

`max_identifier_length` (`integer`)

  Reports the maximum identifier length. It is determined as one less than the value of `NAMEDATALEN` when building the server. The default value of `NAMEDATALEN` is 64; therefore the default `max_identifier_length` is 63 bytes.

`max_index_keys` (`integer`)

  Reports the maximum number of index keys. It is determined by the value of `INDEX_MAX_KEYS` when building the server. The default value is 32 keys.

`server_encoding` (`string`)

  Reports the database encoding (character set). It is determined when the database is created. Ordinarily, clients need only be concerned with the value of client_encoding.

`server_version` (`string`)

  Reports the version number of the server. It is determined by the value of `PG_VERSION` when building the server.

`server_version_num` (`integer`)

  Reports the version number of the server as an integer. It is determined by the value of `PG_VERSION_NUM` when building the server.

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