pg_database
   The catalog pg_database stores information about
   the available databases.  Databases are created with the CREATE DATABASE command.
   Consult Chapter 23 for details about the meaning
   of some of the parameters.
  
   Unlike most system catalogs, pg_database
   is shared across all databases of a cluster: there is only one
   copy of pg_database per cluster, not
   one per database.
  
Table 52.15. pg_database Columns
| Column Type Description | 
|---|
| 
        Row identifier | 
| 
        Database name | 
| 
        Owner of the database, usually the user who created it | 
| 
        
       Character encoding for this database
       ( | 
| 
        LC_COLLATE for this database | 
| 
        LC_CTYPE for this database | 
| 
        
       If true, then this database can be cloned by
       any user with  | 
| 
        
       If false then no one can connect to this database.  This is
       used to protect the  | 
| 
        Sets maximum number of concurrent connections that can be made to this database. -1 means no limit, -2 indicates the database is invalid. | 
| 
        Last system OID in the database; useful particularly to pg_dump | 
| 
        
       All transaction IDs before this one have been replaced with a permanent
       (“frozen”) transaction ID in this database.  This is used to
       track whether the database needs to be vacuumed in order to prevent
       transaction ID wraparound or to allow  | 
| 
        
       All multixact IDs before this one have been replaced with a
       transaction ID in this database.  This is used to
       track whether the database needs to be vacuumed in order to prevent
       multixact ID wraparound or to allow  | 
| 
        
       The default tablespace for the database.
       Within this database, all tables for which
        | 
| 
        Access privileges; see Section 5.7 for details |