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Commit6bd45e5

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Handle int4-int8 sequence migration without full data dump.
1 parentf43b5de commit6bd45e5

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2 files changed

+101
-60
lines changed

2 files changed

+101
-60
lines changed

‎doc/src/sgml/ref/pg_upgrade.sgml‎

Lines changed: 16 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$Header: /cvsroot/pgsql/doc/src/sgml/ref/Attic/pg_upgrade.sgml,v 1.15 2002/01/10 04:58:19 momjian Exp $
2+
$Header: /cvsroot/pgsql/doc/src/sgml/ref/Attic/pg_upgrade.sgml,v 1.16 2002/01/11 04:39:19 momjian Exp $
33
PostgreSQL documentation
44
-->
55

@@ -24,7 +24,7 @@ PostgreSQL documentation
2424
<date>1999-07-31</date>
2525
</refsynopsisdivinfo>
2626
<synopsis>
27-
pg_upgrade -s <replaceable class="parameter">filename</replaceable>[ -d <replaceable class="parameter">filename</replaceable> ]<replaceable class="parameter">old_data_dir</replaceable>
27+
pg_upgrade -s <replaceable class="parameter">filename</replaceable> <replaceable class="parameter">old_data_dir</replaceable>
2828
</synopsis>
2929
</refsynopsisdiv>
3030

@@ -50,10 +50,14 @@ pg_upgrade -s <replaceable class="parameter">filename</replaceable> [ -d <replac
5050
<step performance="required">
5151
<para>
5252
Back up your existing data directory, preferably by making a
53-
complete dump with pg_dumpall. Those upgrading from 7.1 are
54-
required to supply this dump filename to pg_upgrade with the
55-
<option>-d</option> option. Other releases should not use the
56-
<option>-d</option> option.
53+
complete dump with pg_dumpall.
54+
</para>
55+
</step>
56+
57+
<step performance="required">
58+
<para>
59+
<command>VACUUM</command> your entire database using
60+
<command>vacuumdb -a</command.>
5761
</para>
5862
</step>
5963

@@ -111,7 +115,7 @@ $ make install
111115
Change your working directory to the
112116
pgsql main directory, and type:
113117
<programlisting>
114-
$ pg_upgrade -s schema.out-d data.outdata.old
118+
$ pg_upgrade -s schema.out data.old
115119
</programlisting>
116120
The program will do some checking to make sure everything is properly
117121
configured, and will run your db.out script to recreate all the databases
@@ -130,12 +134,6 @@ $ pg_upgrade -s schema.out -d data.out data.old
130134
</para>
131135
</step>
132136

133-
<step performance="required">
134-
<para>
135-
Stop and restart the postmaster.
136-
</para>
137-
</step>
138-
139137
<step performance="required">
140138
<para>
141139
<emphasis>Carefully</emphasis> examine the contents of the upgraded
@@ -154,6 +152,11 @@ $ pg_upgrade -s schema.out -d data.out data.old
154152
</para>
155153
</step>
156154

155+
<note>
156+
<para>
157+
pg_upgrade does not migrate large objects.
158+
</para>
159+
</note>
157160
</procedure>
158161
</refsect1>
159162
</refentry>

‎src/bin/pg_dump/pg_upgrade‎

Lines changed: 85 additions & 47 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
# pg_upgrade: update a database without needing a full dump/reload cycle.
44
# CAUTION: read the manual page before trying to use this!
55

6-
# $Header: /cvsroot/pgsql/src/bin/pg_dump/Attic/pg_upgrade,v 1.23 2002/01/1100:27:42 momjian Exp $
6+
# $Header: /cvsroot/pgsql/src/bin/pg_dump/Attic/pg_upgrade,v 1.24 2002/01/1104:39:19 momjian Exp $
77
#
88
# NOTE: we must be sure to update the version-checking code a few dozen lines
99
# below for each new PostgreSQL release.
@@ -13,7 +13,6 @@ TMPFILE="/tmp/pgupgrade.$$"
1313
trap"rm -f$TMPFILE" 0 1 2 3 15
1414

1515
SCHEMA=""
16-
DATA=""
1716
while ["$#"-gt 1 ]
1817
do
1918
if ["X$1"="X-s" ]
@@ -23,20 +22,13 @@ do
2322
exit 1
2423
fi
2524
shift 2
26-
elif ["X$1"="X-d" ]
27-
thenDATA="$2"
28-
if [!-s"$DATA" ]
29-
thenecho"$DATA does not exist"1>&2
30-
exit 1
31-
fi
32-
shift 2
33-
elseecho"Usage:$0 -s schema_dump [ -d data_dump ] old_data_dir"1>&2
25+
elseecho"Usage:$0 -s schema_dump old_data_dir"1>&2
3426
exit 1
3527
fi
3628
done
3729

3830
if ["$#"-ne 1-o!"$SCHEMA" ]
39-
thenecho"Usage:$0 -s schema_dump[ -d data_dump ]old_data_dir"1>&2
31+
thenecho"Usage:$0 -s schema_dump old_data_dir"1>&2
4032
exit 1
4133
fi
4234

@@ -86,21 +78,6 @@ SRC_VERSION=`cat ./$OLDDIR/PG_VERSION`
8678
# UPGRADE_VERSION is the expected output database version
8779
UPGRADE_VERSION="7.1"
8880

89-
if ["$SRC_VERSION"="7.1"-a!"$DATA" ]
90-
thenecho"$0 requires a full data dump file to upgrade from version$SRC_VERSION."1>&2
91-
echo"Use the '-d' parameter to specify the data dump file"1>&2
92-
echo"If you don't have enough disk space to keep a dump file, grep out the '\\connect' and"1>&2
93-
echo"'SELECT setval' lines from the dump file and pass that file to$0, e.g:"1>&2
94-
echo1>&2
95-
echo"pg_dumpall | egrep '^(\\connect)|SELECT setval \()[^]*$' > data.out"1>&2
96-
exit 1
97-
fi
98-
99-
if ["$SRC_VERSION"!="7.1"-a"$DATA" ]
100-
thenecho"$0 does not require the -d option for this version."1>&2
101-
exit 1
102-
fi
103-
10481
if ["$DEST_VERSION"!="$UPGRADE_VERSION"-a"$DEST_VERSION"!="$SRC_VERSION" ]
10582
thenecho"`basename$0` is for PostgreSQL version$UPGRADE_VERSION, but ./data/PG_VERSION contains$DEST_VERSION."1>&2
10683
echo"Did you run initdb for version$UPGRADE_VERSION?"1>&2
@@ -134,8 +111,8 @@ Install a newer version from pgsql/contrib/pg_resetxlog and continue.; exiting"
134111
exit 1
135112
fi
136113

137-
#We need a highXIDnumber so there is 1 gig gap inXID numbers so the
138-
#moved-over rows can be frozen on next VACUUM.
114+
#If theXIDis > 2 billion, 7.1 database will have non-frozenXID's in
115+
#low numbers, and 7.2 will think they are in the future --- bad.
139116

140117
XID=`pg_resetxlog -n"$OLDDIR"| grep"NextXID"| awk -F' *''{print $4}'`
141118
if ["$SRC_VERSION"="7.1"-a"$XID"-gt 2000000000 ]
@@ -171,26 +148,11 @@ $0 aborted." 1>&2
171148
exit 1
172149
fi
173150

174-
# Set sequence values for 7.1-version sequences, which are int4.
175-
if ["$SRC_VERSION"!="7.1" ]
176-
thenecho"Input script$SCHEMA complete, fixing row commit statuses..."
177-
elseecho"Input script$SCHEMA complete, setting int8 sequences..."
151+
echo"Input script$SCHEMA complete, fixing row commit statuses..."
178152

179-
# Set all the sequence counters because they are not brought over
180-
# in the schema dump.
181-
cat$DATA| egrep'^(\\connect)|SELECT setval \()[^]*$'|
182-
psql"template1"
183-
if [$?-ne 0 ]
184-
thenecho"There were errors in setting the sequence values.
185-
$0 aborted."1>&2
186-
exit 1
187-
fi
188-
189-
echo"Int8 sequences set, fixing row commit statuses..."
190-
fi
191-
192-
# Now vacuum each result database in case our transaction increase
193-
# causes all the XID's to be marked with the frozen XID.
153+
# XXX do we still need this?
154+
# Now vacuum each result database because our movement of transaction log
155+
# causes some committed transactions to appear as non-committed
194156

195157
psql -d template1 -At -c"SELECT datname FROM pg_database"|whileread DB
196158
do
@@ -337,6 +299,82 @@ thenecho "Unable to restart database server.; exiting" 1>&2
337299
exit 1
338300
fi
339301
302+
# Set sequence values for 7.1-version sequences, which were int4.
303+
if ["$SRC_VERSION"="7.1" ]
304+
elseecho"Set int8 sequence values from 7.1..."
305+
306+
psql -d template1 -At -c"SELECT datname FROM pg_database"|
307+
whileread DB
308+
do
309+
echo"$DB"
310+
# XXX is concurrency a problem here?
311+
psql -d"$DB" -At -c"SELECT relname FROM pg_class where relkind = 'S';"|
312+
whileread SEQUENCE
313+
do
314+
psql -d"$DB" -At<<SQL_END
315+
316+
-- This table matches the 7.1 sequence schema
317+
CREATE TABLE temp_seq_int4 (
318+
sequence_name name
319+
last_value integer
320+
increment_by integer
321+
max_value integer
322+
min_value integer
323+
cache_value integer
324+
log_cnt integer
325+
is_cycled "char"
326+
is_called "char"
327+
);
328+
329+
-- Move int8 version of sequence out of the way
330+
UPDATE pg_attribute
331+
SET attrelid = 1 -- OID of template1, not used anywhere else XXX correct?
332+
WHERE attrelid = (SELECT oid FROM pg_class WHERE relname = '$SEQUENCE');
333+
334+
-- Replace with int4 sequence schema
335+
UPDATE pg_attribute
336+
SET attrelid = (SELECT oid FROM pg_class WHERE relname = '$SEQUENCE')
337+
WHERE attrelid = (SELECT oid FROM pg_class WHERE relname = 'temp_seq_int4');
338+
339+
-- Select sequence value into temp table
340+
CREATE TEMP TABLE hold_sequence AS
341+
SELECT last_value
342+
FROM "$SEQUENCE"
343+
344+
-- Prepare int4 sequence table for removal and remove it
345+
UPDATE pg_attribute
346+
SET attrelid = (SELECT oid FROM pg_class WHERE relname = 'temp_seq_int4')
347+
WHERE attrelid = (SELECT oid FROM pg_class WHERE relname = '$SEQUENCE');
348+
349+
DROP TABLE temp_seq_int4;
350+
351+
-- Restore int8 version of sequence
352+
UPDATE pg_attribute
353+
SET attrelid = (SELECT oid FROM pg_class WHERE relname = '$SEQUENCE')
354+
WHERE attrelid = 1;
355+
356+
-- Mark sequence as ordinary table and update it
357+
UPDATE pg_class
358+
SET relkind = 't'
359+
WHERE relname = '$SEQUENCE';
360+
361+
UPDATE "$SEQUENCE"
362+
SET last_value = (SELECT last_value FROM hold_sequence);
363+
364+
-- Restore sequence flag
365+
UPDATE pg_class
366+
SET relkind = 'S'
367+
WHERE relname = '$SEQUENCE';
368+
369+
SQL_END
370+
if [$?-ne 0 ]
371+
thenecho"There were errors during int4 sequence restore.
372+
$0 aborted."1>&2
373+
exit 1
374+
done
375+
done
376+
fi
377+
340378
echo"You may remove the$OLDDIR directory with 'rm -r$OLDDIR'."
341379
342380
exit 0

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