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Fix initdb spaces problem.
This commit is contained in:
Bruce Momjian
parent
1d2fea9bc5
commit
7bd58b4712
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@ -909,7 +909,7 @@ From owner-pgsql-hackers@hub.org Thu Dec 30 08:01:09 1999
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@ -1006,7 +1006,7 @@ From owner-pgsql-patches@hub.org Sun Jan 2 23:01:38 2000
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@ -1424,7 +1424,7 @@ From owner-pgsql-hackers@hub.org Tue Jan 4 10:31:01 2000
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@ -1558,3 +1558,62 @@ Sorry, I not sure if I re-draw previous picture total good..
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************
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From pgsql-hackers-owner+M3133@hub.org Fri Jun 9 15:02:25 2000
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Message-ID: <39413D08.A6BDC664@quiknet.com>
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Date: Fri, 09 Jun 2000 11:52:57 -0700
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From: Paul Condon <pecondon@quiknet.com>
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To: ohp@pyrenet.fr, pgsql-hackers@postgresql.org
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Subject: [HACKERS] Re: Big project, please help
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Status: OR
|
||||
|
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Two way replication on a single "table" is availabe in Lotus Notes. In
|
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Notes, every record has a time-stamp, which contains the time of the
|
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last update. (It also has a creation timestamp.) During replication,
|
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timestamps are compared at the row/record level, and compared with the
|
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timestamp of the last replication. If, for corresponding rows in two
|
||||
replicas, the timestamp of one row is newer than the last replication,
|
||||
the contents of this newer row is copied to the other replica. But if
|
||||
both of the corresponding rows have newer timestamps, there is a
|
||||
problem. The Lotus Notes solution is to:
|
||||
1. send a replication conflict message to the Notes Administrator,
|
||||
which message contains full copies of both rows.
|
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2. copy the newest row over the less new row in the replicas.
|
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3. there is a mechanism for the Administrator to reverse the default
|
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decision in 2, if the semantics of the message history, or off-line
|
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investigation indicates that the wrong decision was made.
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|
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In practice, the Administrator is not overwhelmed with replication
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conflict messages because updates usually only originate at the site
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that originally created the row. Or updates fill only fields that were
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originally 'TBD'. The full logic is perhaps more complicated than I have
|
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described here, but it is already complicated enough to give you an idea
|
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of what you're really being asked to do. I am not aware of a supplier of
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relational database who really supports two way replication at the level
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that Notes supports it, but Notes isn't a relational database.
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The difficulty of the position that you appear to be in is that
|
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management might believe that the full problem is solved in brand X
|
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RDBMS, and you will have trouble convincing management that this is not
|
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really true.
|
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|
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|
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@ -2,7 +2,7 @@ From pgsql-hackers-owner+M174@hub.org Sun Mar 12 22:31:11 2000
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@ -480,7 +480,7 @@ From Inoue@tpf.co.jp Wed Mar 15 02:00:58 2000
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@ -539,3 +539,203 @@ Hiroshi Inoue
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Inoue@tpf.co.jp
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From pgsql-hackers-owner+M196@hub.org Thu Mar 16 03:02:35 2000
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Date: Thu, 16 Mar 2000 08:28:11 +0100 (CET)
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From: Martin Neumann <mne@mne.de>
|
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Subject: [HACKERS] RfD: Design of tablespaces
|
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To: pgsql-hackers@postgresql.org
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Status: OR
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I have written some thoughts on the concept of tablespace
|
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down. I would be happy to get some comments on it.
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-----------------------------------------------------------------
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Implementation of tablespaces within PostgreSQL
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- a brainstorming paper designed for general discussion -
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by Martin Neumann, 2000/3/15
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1. What are tablespaces?
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-------------------------
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Tablespaces make it possible to distribute storage objects
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over multiple points of storage (POS). Therefor one could
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say a tablespace can be a POS.
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Example:
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tablespace_a -----> /mnt/raid/arena0/
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tablespace_b -----> /mnt/raid/emc0/
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Tablespaces can also store their data on other tablespaces:
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tablespace_c -----> tablespace_b
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This is quite interessting for administration purposes.
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2. What are its advantages?
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----------------------------
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As you can choose a different tablespace for every storage
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object (table, index etc.) it is easy to improve the following
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aspects of your system:
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- Reliability
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You can put storage objects (mostly tables) you strongly depend
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on onto a more reliable tablespace (mirrored RAID or perhaps
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simply a directory which gets backuped more often than others).
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- Speed
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You can put storage objects you rarely need onto a rather slow
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tablespace and keep your quick tablespaces clean from this.
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A fast, but more expensive RAID-Stripeset can be used more
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efficiently as it doesn't get filled with non-performance
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sensitive data.
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But also distributing storage objects which have equal needs
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in sense of speed onto different tablespaces makes sense as
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you gain more speed by distributing data over more than one
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harddisk spindle.
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- Manageability
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You can grant and revoke rights on base of a tablespace.
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As every storage object belongs to exactly one tablespace,
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you can easily group storage objects using a tablespace.
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3. What about disk I/O?
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------------------------
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Tablespaces tell the storage manager only where to store
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the data, not how. This is the reasonable way.
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4. Usage
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---------
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CREATE TABLESPACE tsname TYPE storage_type storage_options
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Examples:
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CREATE TABLESPACE tsemc0
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TYPE classic DIRECTORY /mnt/raid/emc0 NOFSYNC
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CREATE TABLESPACE tsarena0 TYPE raw DEVICE /dev/araid/0
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MINSIZE 128 MAXSIZE 4096 GROW 4 32 SHRINK 2 32
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BLOCKSIZE 16384
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CREATE TABLESPACE quick0 TYPE link TABLESPACE tsarena0;
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--
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CREATE TABLE tbname ( ... ) TABLESPACE tsname;
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Examples:
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CREATE TABLE foo (
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id int4 NOT NULL UNIQUE,
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name text NOT NULL
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) TABLESPACE tsemc0;
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CREATE TABLE bar (
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id int4 NOT NULL UNIQUE,
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name text NOT NULL
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) TABLESPACE default;
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If the tablespace isn't given, the storage objects gets created
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in the "default" tablespace.
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"default" is the PostgreSQL's default tablespace and the only one
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which has to exist on each system.
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--
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ALTER TABLESPACE tsname tssettings
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Examples:
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ALTER TABLESPACE tsemc0 DIRECTORY /mnt/raid/emc1
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NOTE: altering tablespaces without recreating the contained
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storage objects introduces many problems.
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Realisation is difficult and won't be my first goal.
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--
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DROP TABLESPACE tsname [FORCE]
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Examples:
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DROP TABLESPACE tsarena0
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This will immediately remove the tablespace tsarena0
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if it contains no storage objects.
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If it still contains some the tablespace is marked for
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deletion.
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This means:
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1. you can't create new storage objects in the tablespace
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2. if the last storage object inside gets dropped, the
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tablespace will be removed.
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|
||||
DROP TABLESPACE tsarena0 FORCE
|
||||
|
||||
This will remove the tablespace including all contained
|
||||
storage objects immediately.
|
||||
|
||||
--
|
||||
|
||||
VACUUM tsname
|
||||
|
||||
Example:
|
||||
|
||||
VACUUM tsemc1
|
||||
|
||||
This will vacuum a single tablespace with all contained
|
||||
storage objects.
|
||||
-----------------------------------------------------------------
|
||||
|
||||
--
|
||||
Martin Neumann, Welkenrather Str. 118c, 52074 Aachen, Germany
|
||||
mne@mne.de - http://www.mne.de/mne/ - sms@mne.de [eMail2SMS]
|
||||
Tel. 0241 / 8876-080 - Mobil: 0173 / 27 69 632
|
||||
..------.---------------------------------------------------------
|
||||
| at | Inform GmbH - Abteilung Airport Logistics
|
||||
| work | Pascalstr. 23 - 52076 Aachen - Tel. 02408 / 9456-0
|
||||
|______| martin.neumann@inform-ac.com - http://www.inform-ac.com
|
||||
|
||||
|
||||
|
||||
|
||||
@ -26,7 +26,7 @@
|
||||
#
|
||||
#
|
||||
# IDENTIFICATION
|
||||
# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.94 2000/06/09 15:50:49 momjian Exp $
|
||||
# $Header: /cvsroot/pgsql/src/bin/initdb/Attic/initdb.sh,v 1.95 2000/06/09 23:50:24 momjian Exp $
|
||||
#
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
@ -523,7 +523,7 @@ echo "CREATE VIEW pg_user AS \
|
||||
usename, \
|
||||
usesysid, \
|
||||
usecreatedb, \
|
||||
usecreatetable, \
|
||||
usecreatetable, \
|
||||
uselocktable, \
|
||||
usetrace, \
|
||||
usesuper, \
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user