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* Programatically switching database
@ 2003-11-15 04:36 ow <oneway_111@yahoo.com>
2003-11-15 10:11 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
0 siblings, 2 replies; 15+ messages in thread
From: ow @ 2003-11-15 04:36 UTC (permalink / raw)
To: pgsql-sql
Hi,
Suppose pgSql server is running databases "db1" and "db2" that are in the same
db cluster. A client app establishes connection "conn1" to db1. Is there a way
to programatically switch conn1 to use db2 without doing
disconnect-from-db1-connect-to-db2? Something like what "\c" does but to be
used independently from psql? I need this to be able to reuse a pool of
connections to db1 for actions on db1, db2 ... dbn.
Thanks
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^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-15 10:11 ` Peter Eisentraut <peter_e@gmx.net>
1 sibling, 0 replies; 15+ messages in thread
From: Peter Eisentraut @ 2003-11-15 10:11 UTC (permalink / raw)
To: ow <oneway_111@yahoo.com>; +Cc: pgsql-sql
ow writes:
> Is there a way to programatically switch conn1 to use db2 without doing
> disconnect-from-db1-connect-to-db2? Something like what "\c" does but to
> be used independently from psql? I need this to be able to reuse a pool
> of connections to db1 for actions on db1, db2 ... dbn.
Nothing prevents you from keeping the connection to db1 open when you open
a connection to db2. By the way, psql's "\c" command does exactly
disconnect-from-db1-connect-to-db2.
--
Peter Eisentraut peter_e@gmx.net
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-15 16:00 ` ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
1 sibling, 1 reply; 15+ messages in thread
From: ow @ 2003-11-15 16:00 UTC (permalink / raw)
To: Peter Eisentraut <peter_e@gmx.net>; +Cc: pgsql-sql
--- Peter Eisentraut wrote:
> Nothing prevents you from keeping the connection to db1 open when you open
> a connection to db2. By the way, psql's "\c" command does exactly
> disconnect-from-db1-connect-to-db2.
That's the whole point: I'm trying to avoid maintaining *separate* connection
pools for each db. In other words, instead of having, say, 5 connection pools
to 5 dbs with total of 1000 connections, I could've used just one (1) pool with
200 connections, if there was a way to "switch db" (or to do a cross-db query).
Any ideas? Thanks
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^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-15 16:36 ` Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:37 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
0 siblings, 2 replies; 15+ messages in thread
From: Peter Eisentraut @ 2003-11-15 16:36 UTC (permalink / raw)
To: ow <oneway_111@yahoo.com>; +Cc: pgsql-sql
ow writes:
> That's the whole point: I'm trying to avoid maintaining *separate* connection
> pools for each db. In other words, instead of having, say, 5 connection pools
> to 5 dbs with total of 1000 connections, I could've used just one (1) pool with
> 200 connections, if there was a way to "switch db" (or to do a cross-db query).
I'm afraid that what you want to do is not possible. Perhaps you want to
organize your data into schemas, not databases.
--
Peter Eisentraut peter_e@gmx.net
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
@ 2003-11-15 18:35 ` ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
1 sibling, 1 reply; 15+ messages in thread
From: ow @ 2003-11-15 18:35 UTC (permalink / raw)
To: Peter Eisentraut <peter_e@gmx.net>; +Cc: pgsql-sql
--- Peter Eisentraut <peter_e@gmx.net> wrote:
> I'm afraid that what you want to do is not possible. Perhaps you want to
> organize your data into schemas, not databases.
There's too much data to put it in one db. If anything happens to it, I'll
never be able to restore (or dump) it in time. BTW, mySql has cross-db queries.
Thanks
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^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-15 18:42 ` Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
0 siblings, 1 reply; 15+ messages in thread
From: Peter Eisentraut @ 2003-11-15 18:42 UTC (permalink / raw)
To: ow <oneway_111@yahoo.com>; +Cc: pgsql-sql
ow writes:
> There's too much data to put it in one db.
There is never too much data to be put in one database.
> If anything happens to it, I'll never be able to restore (or dump) it in
> time.
You could just dump individual schemas.
> BTW, mySql has cross-db queries.
PostgreSQL has schemas, that's the same thing. PostgreSQL's "databases"
are not the same thing as MySQL's "databases".
--
Peter Eisentraut peter_e@gmx.net
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
@ 2003-11-15 19:08 ` ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
0 siblings, 1 reply; 15+ messages in thread
From: ow @ 2003-11-15 19:08 UTC (permalink / raw)
To: Peter Eisentraut <peter_e@gmx.net>; +Cc: pgsql-sql
--- Peter Eisentraut <peter_e@gmx.net> wrote:
> You could just dump individual schemas.
How? The doc only mentions db: pg_dump [option...] [dbname]
Then, how would I lock users out from the schema while it's being loaded?
Thanks
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^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-16 01:50 ` ow <oneway_111@yahoo.com>
2003-11-16 02:18 ` Re: Programatically switching database Jan Wieck <JanWieck@Yahoo.com>
0 siblings, 1 reply; 15+ messages in thread
From: ow @ 2003-11-16 01:50 UTC (permalink / raw)
To: ow <oneway_111@yahoo.com>; Peter Eisentraut <peter_e@gmx.net>; +Cc: pgsql-sql
--- ow <oneway_111@yahoo.com> wrote:
> How? The doc only mentions db: pg_dump [option...] [dbname]
>
> Then, how would I lock users out from the schema while it's being loaded?
Never mind how, I see there's "-n namespace" option in 7.4. But still, how
would I lock users out from the schema while it's being loaded?
Thanks
__________________________________
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^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-16 02:18 ` Jan Wieck <JanWieck@Yahoo.com>
2003-11-16 02:20 ` Re: Programatically switching database Jan Wieck <JanWieck@Yahoo.com>
2003-11-16 05:18 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
0 siblings, 2 replies; 15+ messages in thread
From: Jan Wieck @ 2003-11-16 02:18 UTC (permalink / raw)
To: ow <oneway_111@Yahoo.com>; +Cc: Peter Eisentraut <peter_e@gmx.net>; pgsql-sql
ow wrote:
> --- ow <oneway_111@yahoo.com> wrote:
>> How? The doc only mentions db: pg_dump [option...] [dbname]
>>
>> Then, how would I lock users out from the schema while it's being loaded?
>
> Never mind how, I see there's "-n namespace" option in 7.4. But still, how
> would I lock users out from the schema while it's being loaded?
#!/bin/sh
(
echo "start transaction;"
cat $2
echo "commit transaction;"
) psql $1
then call it as
reload_in_transaction my_db my_namespace.dump
Since the whole dump will be restored inside of one transaction, nobody
will see it while it's reloading.
Jan
--
#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me. #
#================================================== JanWieck@Yahoo.com #
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 02:18 ` Re: Programatically switching database Jan Wieck <JanWieck@Yahoo.com>
@ 2003-11-16 02:20 ` Jan Wieck <JanWieck@Yahoo.com>
1 sibling, 0 replies; 15+ messages in thread
From: Jan Wieck @ 2003-11-16 02:20 UTC (permalink / raw)
To: Jan Wieck <JanWieck@Yahoo.com>; +Cc: ow <oneway_111@Yahoo.com>; Peter Eisentraut <peter_e@gmx.net>; pgsql-sql
Jan Wieck wrote:
> ow wrote:
>
>> --- ow <oneway_111@yahoo.com> wrote:
>>> How? The doc only mentions db: pg_dump [option...] [dbname]
>>>
>>> Then, how would I lock users out from the schema while it's being loaded?
>>
>> Never mind how, I see there's "-n namespace" option in 7.4. But still, how
>> would I lock users out from the schema while it's being loaded?
>
> #!/bin/sh
>
> (
> echo "start transaction;"
> cat $2
> echo "commit transaction;"
> ) psql $1
gosh, there's the pipe missing before the psql
>
>
>
> then call it as
>
> reload_in_transaction my_db my_namespace.dump
>
> Since the whole dump will be restored inside of one transaction, nobody
> will see it while it's reloading.
>
>
> Jan
>
--
#======================================================================#
# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me. #
#================================================== JanWieck@Yahoo.com #
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 02:18 ` Re: Programatically switching database Jan Wieck <JanWieck@Yahoo.com>
@ 2003-11-16 05:18 ` ow <oneway_111@yahoo.com>
2003-11-16 14:52 ` Re: Programatically switching database Tom Lane <tgl@sss.pgh.pa.us>
2003-11-17 06:17 ` Re: Programatically switching database Greg Stark <gsstark@mit.edu>
1 sibling, 2 replies; 15+ messages in thread
From: ow @ 2003-11-16 05:18 UTC (permalink / raw)
To: Jan Wieck <JanWieck@yahoo.com>; +Cc: pgsql-sql
--- Jan Wieck <JanWieck@yahoo.com> wrote:
> #!/bin/sh
>
> (
> echo "start transaction;"
> cat $2
> echo "commit transaction;"
> ) psql $1
>
>
>
> then call it as
>
> reload_in_transaction my_db my_namespace.dump
>
> Since the whole dump will be restored inside of one transaction, nobody
> will see it while it's reloading.
Interesting idea. I know some RDBMSs that are very picky about DDL in
transactions but it appears pgSql handles it without any problems.
My concern though ... wouldn't pgSql server collapse when faced with
transaction spawning across 100M+ records? And how would that affect overall
restore time? I've should've tried it myself but I can't, my "regular"
pg_restore has been running for 4+ hours, can't kill now ...
Thanks
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^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 02:18 ` Re: Programatically switching database Jan Wieck <JanWieck@Yahoo.com>
2003-11-16 05:18 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-16 14:52 ` Tom Lane <tgl@sss.pgh.pa.us>
2003-11-16 15:22 ` Re: Programatically switching database Christopher Browne <cbbrowne@acm.org>
1 sibling, 1 reply; 15+ messages in thread
From: Tom Lane @ 2003-11-16 14:52 UTC (permalink / raw)
To: ow <oneway_111@yahoo.com>; +Cc: Jan Wieck <JanWieck@yahoo.com>; pgsql-sql
ow <oneway_111@yahoo.com> writes:
> My concern though ... wouldn't pgSql server collapse when faced with
> transaction spawning across 100M+ records?
No. You're extrapolating from Oracle-specific assumptions again.
regards, tom lane
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 02:18 ` Re: Programatically switching database Jan Wieck <JanWieck@Yahoo.com>
2003-11-16 05:18 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 14:52 ` Re: Programatically switching database Tom Lane <tgl@sss.pgh.pa.us>
@ 2003-11-16 15:22 ` Christopher Browne <cbbrowne@acm.org>
0 siblings, 0 replies; 15+ messages in thread
From: Christopher Browne @ 2003-11-16 15:22 UTC (permalink / raw)
To: pgsql-sql
Clinging to sanity, tgl@sss.pgh.pa.us (Tom Lane) mumbled into her beard:
> ow <oneway_111@yahoo.com> writes:
>> My concern though ... wouldn't pgSql server collapse when faced with
>> transaction spawning across 100M+ records?
>
> No. You're extrapolating from Oracle-specific assumptions again.
Or from MySQL-specific assumptions :-).
It seems reasonable (absent of particular knowledge to the contrary)
that the size of a transaction might be _expected_ to be some sort of
constraint; it is quite surprising that it isn't, and I don't think
that's purely based on the mistake of assuming that the whole world
does things exactly like Oracle.
--
(format nil "~S@~S" "cbbrowne" "acm.org")
http://cbbrowne.com/info/postgresql.html
Rules of the Evil Overlord #89. "After I captures the hero's
superweapon, I will not immediately disband my legions and relax my
guard because I believe whoever holds the weapon is unstoppable. After
all, the hero held the weapon and I took it from him."
<http://www.eviloverlord.com/;
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-16 02:18 ` Re: Programatically switching database Jan Wieck <JanWieck@Yahoo.com>
2003-11-16 05:18 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
@ 2003-11-17 06:17 ` Greg Stark <gsstark@mit.edu>
1 sibling, 0 replies; 15+ messages in thread
From: Greg Stark @ 2003-11-17 06:17 UTC (permalink / raw)
To: ow <oneway_111@yahoo.com>; +Cc: Jan Wieck <JanWieck@yahoo.com>; pgsql-sql
ow <oneway_111@yahoo.com> writes:
> My concern though ... wouldn't pgSql server collapse when faced with
> transaction spawning across 100M+ records?
The number of records involved really doesn't faze Postgres at all. However
the amount of time spent in the transaction could be an issue if there is
other activity in other schemas of the same database.
As long as the transaction is running none of the deleted or old updated data
in any schema of the database can be cleaned up by vacuum as postgres thinks
the big transaction "might" need to see it sometime.
So if the rest of the database is still active the tables and indexes being
updated may grow larger than normal. If it goes on for a _really_ long time
they might need a VACUUM FULL at some point to clean them up.
--
greg
^ permalink raw reply [nested|flat] 15+ messages in thread
* Re: Programatically switching database
2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:00 ` Re: Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Re: Programatically switching database Peter Eisentraut <peter_e@gmx.net>
@ 2003-11-15 18:37 ` ow <oneway_111@yahoo.com>
1 sibling, 0 replies; 15+ messages in thread
From: ow @ 2003-11-15 18:37 UTC (permalink / raw)
To: Peter Eisentraut <peter_e@gmx.net>; +Cc: pgsql-sql
--- Peter Eisentraut <peter_e@gmx.net> wrote:
> I'm afraid that what you want to do is not possible. Perhaps you want to
> organize your data into schemas, not databases.
There's too much data to put it in one db. If anything happens to it, I'll
never be able to restore (or dump) it in time. BTW, mySql has cross-db queries.
Thanks
__________________________________
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^ permalink raw reply [nested|flat] 15+ messages in thread
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2003-11-15 04:36 Programatically switching database ow <oneway_111@yahoo.com>
2003-11-15 10:11 ` Peter Eisentraut <peter_e@gmx.net>
2003-11-15 16:00 ` ow <oneway_111@yahoo.com>
2003-11-15 16:36 ` Peter Eisentraut <peter_e@gmx.net>
2003-11-15 18:35 ` ow <oneway_111@yahoo.com>
2003-11-15 18:42 ` Peter Eisentraut <peter_e@gmx.net>
2003-11-15 19:08 ` ow <oneway_111@yahoo.com>
2003-11-16 01:50 ` ow <oneway_111@yahoo.com>
2003-11-16 02:18 ` Jan Wieck <JanWieck@Yahoo.com>
2003-11-16 02:20 ` Jan Wieck <JanWieck@Yahoo.com>
2003-11-16 05:18 ` ow <oneway_111@yahoo.com>
2003-11-16 14:52 ` Tom Lane <tgl@sss.pgh.pa.us>
2003-11-16 15:22 ` Christopher Browne <cbbrowne@acm.org>
2003-11-17 06:17 ` Greg Stark <gsstark@mit.edu>
2003-11-15 18:37 ` ow <oneway_111@yahoo.com>
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