PostgreSQL 9.0.4 Documentation
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# E.191. Release 1.01

> Release date: 1996-02-23

## E.191.1. Migration from version 1.0 to version 1.01

The following notes are for the benefit of users who want to migrate databases from Postgres95 1.0 to Postgres95 1.01.

If you are starting afresh with Postgres95 1.01 and do not need to migrate old databases, you do not need to read any further.

In order to Postgres95 version 1.01 with databases created with Postgres95 version 1.0, the following steps are required:

1. Set the definition of `NAMEDATALEN` in `src/Makefile.global` to 16 and `OIDNAMELEN` to 20.

2. Decide whether you want to use Host based authentication.

   1. If you do, you must create a file name `pg_hba` in your top-level data directory (typically the value of your `$PGDATA`). `src/libpq/pg_hba` shows an example syntax.

   2. If you do not want host-based authentication, you can comment out the line:

          HBA = 1

      in `src/Makefile.global`

      Note that host-based authentication is turned on by default, and if you do not take steps A or B above, the out-of-the-box 1.01 will not allow you to connect to 1.0 databases.

3. Compile and install 1.01, but DO NOT do the `initdb` step.

4. Before doing anything else, terminate your 1.0 postmaster, and backup your existing `$PGDATA` directory.

5. Set your `PGDATA` environment variable to your 1.0 databases, but set up path up so that 1.01 binaries are being used.

6. Modify the file ``$PGDATA`/PG_VERSION` from 5.0 to 5.1

7. Start up a new 1.01 postmaster

8. Add the new built-in functions and operators of 1.01 to 1.0 databases. This is done by running the new 1.01 server against your own 1.0 database and applying the queries attached and saving in the file 1.0_to_1.01.sql. This can be done easily through `psql`. If your 1.0 database is name `testdb`:

       % psql testdb -f 1.0_to_1.01.sql

   and then execute the following commands (cut and paste from here):

       -- add builtin functions that are new to 1.01

       create function int4eqoid (int4, oid) returns bool as 'foo'
       language 'internal';
       create function oideqint4 (oid, int4) returns bool as 'foo'
       language 'internal';
       create function char2icregexeq (char2, text) returns bool as 'foo'
       language 'internal';
       create function char2icregexne (char2, text) returns bool as 'foo'
       language 'internal';
       create function char4icregexeq (char4, text) returns bool as 'foo'
       language 'internal';
       create function char4icregexne (char4, text) returns bool as 'foo'
       language 'internal';
       create function char8icregexeq (char8, text) returns bool as 'foo'
       language 'internal';
       create function char8icregexne (char8, text) returns bool as 'foo'
       language 'internal';
       create function char16icregexeq (char16, text) returns bool as 'foo'
       language 'internal';
       create function char16icregexne (char16, text) returns bool as 'foo'
       language 'internal';
       create function texticregexeq (text, text) returns bool as 'foo'
       language 'internal';
       create function texticregexne (text, text) returns bool as 'foo'
       language 'internal';

       -- add builtin functions that are new to 1.01

       create operator = (leftarg = int4, rightarg = oid, procedure = int4eqoid);
       create operator = (leftarg = oid, rightarg = int4, procedure = oideqint4);
       create operator ~* (leftarg = char2, rightarg = text, procedure = char2icregexeq);
       create operator !~* (leftarg = char2, rightarg = text, procedure = char2icregexne);
       create operator ~* (leftarg = char4, rightarg = text, procedure = char4icregexeq);
       create operator !~* (leftarg = char4, rightarg = text, procedure = char4icregexne);
       create operator ~* (leftarg = char8, rightarg = text, procedure = char8icregexeq);
       create operator !~* (leftarg = char8, rightarg = text, procedure = char8icregexne);
       create operator ~* (leftarg = char16, rightarg = text, procedure = char16icregexeq);
       create operator !~* (leftarg = char16, rightarg = text, procedure = char16icregexne);
       create operator ~* (leftarg = text, rightarg = text, procedure = texticregexeq);
       create operator !~* (leftarg = text, rightarg = text, procedure = texticregexne);

## E.191.2. Changes

    Incompatibilities:
     * 1.01 is backwards compatible with 1.0 database provided the user
       follow the steps outlined in the MIGRATION_from_1.0_to_1.01 file.
       If those steps are not taken, 1.01 is not compatible with 1.0 database.

    Enhancements:
     * added PQdisplayTuples() to libpq and changed monitor and psql to use it
     * added NeXT port (requires SysVIPC implementation)
     * added CAST .. AS ... syntax
     * added ASC and DESC key words
     * added 'internal' as a possible language for CREATE FUNCTION
       internal functions are C functions which have been statically linked
       into the postgres backend.
     * a new type "name" has been added for system identifiers (table names,
       attribute names, etc.)  This replaces the old char16 type.   The
       of name is set by the NAMEDATALEN #define in src/Makefile.global
     * a readable reference manual that describes the query language.
     * added host-based access control.  A configuration file ($PGDATA/pg_hba)
       is used to hold the configuration data.  If host-based access control
       is not desired, comment out HBA=1 in src/Makefile.global.
     * changed regex handling to be uniform use of Henry Spencer's regex code
       regardless of platform.  The regex code is included in the distribution
     * added functions and operators for case-insensitive regular expressions.
       The operators are ~* and !~*.
     * pg_dump uses COPY instead of SELECT loop for better performance

    Bug fixes:
     * fixed an optimizer bug that was causing core dumps when
       functions calls were used in comparisons in the WHERE clause
     * changed all uses of getuid to geteuid so that effective uids are used
     * psql now returns non-zero status on errors when using -c
     * applied public patches 1-14

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