Re: how do I do dump and restore without bugging with constraint?

Quote: "However if you have to modify table definitions, you will probably
not be able to import data in that new schema and it will be necesary to
look for a new strategy."
For schema, are we talking about attribute columns (structure of table) and
"table definitions" referraled you talking about things like "data types"?If
error came out during restore are related with table definitions then it's
probably no help?I see something related with Deferrable and Initially
deferrable that seems like something could avoid constraints when dumping
and restore, but it has to modify the table or re-create all of them to have
such option (maybe is what you referraled "table definitions"). Is it what
it can be use for to avoid during dumping and restoring?

DEFERRABLE
NOT DEFERRABLE

This controls whether the constraint can be deferred. A constraint that is
not deferrable will be checked immediately after every command. Checking of
constraints that are deferrable can be postponed until the end of the
transaction (using the *SET
CONSTRAINTS*<http://www.postgresql.org/docs/8.3/static/sql-set-constraints.html>command).
NOT
DEFERRABLE is the default. Only foreign key constraints currently accept
this clause. All other constraint types are not deferrable.
INITIALLY IMMEDIATE
INITIALLY DEFERRED

If a constraint is deferrable, this clause specifies the default time to
check the constraint. If the constraint is INITIALLY IMMEDIATE, it is
checked after each statement. This is the default. If the constraint
is INITIALLY
DEFERRED, it is checked only at the end of the transaction. The constraint
check time can be altered with the *SET
CONSTRAINTS*<http://www.postgresql.org/docs/8.3/static/sql-set-constraints.html>command.

On Wed, Feb 24, 2010 at 1:49 AM, Iñigo Martinez Lasala <
imartinez(at)vectorsf(dot)com> wrote:

> To avoid contraints you have to use –disable-triggers flag during
> restore. That is done in step 5.
>
>
>
> In order to modify schema you have to locate what is failing. So, first
> restore old schema without modifications in your new database, watch for
> errors and fix them.
>
> For example:
>
> psql -U username -d database -h server_destination -f schema.sql
> 2>import_error.log
>
>
>
> You’ll find all import errors in import_error.log. Since you are only going
> to launch an schema definition, It will only take a few seconds, so test all
> you need.
>
> After locating errors, open schema.sql with your favorite editor and fix
> them. There are minor changes between postgresql versions and you’ll
> probably have no problems in order to fix them, or ask here if you have many
> problems.
>
> Once fixed, you will have your new modified_schema.sql and you can proceed
> with steps 4 and 5.
>
>
>
> Obviously, if errors are related to indexes, functions, broken
> dependencies, etc without touching table definitions, everything will go
> well. However if you have to modify table definitions, you will probably not
> be able to import data in that new schema and it will be necesary to look
> for a new strategy.
>
>
>
> *De:* Net Tree Inc. [mailto:nettreeinc(at)gmail(dot)com]
> *Enviado el:* martes, 23 de febrero de 2010 17:36
> *Para:* Iñigo Martinez Lasala
> *CC:* pgsql-admin(at)postgresql(dot)org; pgsql-general(at)postgresql(dot)org
> *Asunto:* Re: [ADMIN] how do I do dump and restore without bugging with
> constraint?
>
>
>
> Thanks. Is it by doing these steps I can avoid constrain restriction? for
> step 3, how should I modify the schema? and which schema? the target DB's
> schema that I am trying to dump the schema and data in? But this is the
> problem, I am not sure whats different between the two schema's, there are
> just too many tables to check. What's your tips?
>
> Steven
>
> On Tue, Feb 23, 2010 at 7:03 PM, Iñigo Martinez Lasala <
> imartinez(at)vectorsf(dot)com> wrote:
>
> Using pg_dump from your new host (that is, newer version)
>
> 1- Dump schema.
> pg_dump -h server_source -U username -s -Fp -f schema.sql database
>
> 2- Dump data only.
> pg_dump -h server_source -U username -a -Fc -f data.dmp database
>
> 3- Modify schema.
>
> 4- Restore schema in new host.
> psql -U username -d database -h server_destination -f modified_schema.sql
>
> 5- Restore data disabling triggers
> pg_restore -h server_destination -U username -d database --disable-triggers
> -a data.dmp
>
>
>
>
> -----Original Message-----
> *From*: Net Tree Inc. <nettreeinc(at)gmail(dot)com<%22Net%20Tree%20Inc(dot)%22%20%3cnettreeinc(at)gmail(dot)com%3e>
> >
> *To*: pgsql-admin(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org
> *Subject*: [ADMIN] how do I do dump and restore without bugging with
> constraint?
> *Date*: Tue, 23 Feb 2010 12:50:27 +0800
>
> Hi all,
>
> I am dumping both schema and data from old database to new one. The new
> database schema is somehow contain slightly different schema then the old
> one. When I do restore it shown alot errors related with constraints. How
> can I dump and to restore from old to new without dealing with constraint
> and just forces data dump to where it suppose to belong?
>
>
>
>
>
>
>
>
>
>
>
> --
> ---------------------------------------
> Steven Huang
>

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Steven Huang