/usr/share/doc/slony1-2-bin/examples/slony1_dump.sh is in slony1-2-bin 2.2.3-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# ----------
# slony1_dump.sh
#
#
#
# This script creates a special data only dump from a subscriber
# node. The stdout of this script, fed into psql for a database that
# has the user schema of the replicated database installed, will
# prepare that database for log archive application.
# ----------
# ----
# Check for correct usage
# ----
if test $# -lt 2 ; then
echo "usage: $0 subscriber-dbname clustername [-omit_copy ]" >&2
exit 1
fi
# ----
# Remember call arguments and get the nodeId of the DB specified
# ----
dbname=$1
cluster=$2
clname="\"_$2\""
omit_copy=0
if test $# -eq 3; then
if [ "$3" = "-omit_copy" ];
then
omit_copy=1
else
echo "usage: $0 subscriber-dbname clustername [-omit_copy ]" >&2
exit 1
fi
fi
pgc="\"pg_catalog\""
nodeid=`psql -q -At -c "select \"_$cluster\".getLocalNodeId('_$cluster')" $dbname`
# ----
# Get a list of all replicated table ID's this subscriber receives,
# and remember the table names.
# ----
tables=`psql -q -At -d $dbname -c \
"select tab_id from $clname.sl_table, $clname.sl_set
where tab_set = set_id
and exists (select 1 from $clname.sl_subscribe
where sub_set = set_id
and sub_receiver = $nodeid)"`
for tab in $tables ; do
eval tabname_$tab=`psql -q -At -d $dbname -c \
"select $pgc.quote_ident(tab_nspname) || '.' ||
$pgc.quote_ident(tab_relname) from
$clname.sl_table where tab_id = $tab"`
done
# ----
# Get a list of all replicated sequence ID's this subscriber receives,
# and remember the sequence names.
# ----
sequences=`psql -q -At -d $dbname -c \
"select seq_id from $clname.sl_sequence, $clname.sl_set
where seq_set = set_id
and exists (select 1 from $clname.sl_subscribe
where sub_set = set_id
and sub_receiver = $nodeid)"`
for seq in $sequences ; do
eval seqname_$seq=`psql -q -At -d $dbname -c \
"select $pgc.quote_ident(seq_nspname) || '.' ||
$pgc.quote_ident(seq_relname) from
$clname.sl_sequence where seq_id = $seq"`
done
# ----
# Emit SQL code to create the slony specific object required
# in the remote database.
# ----
cat <<_EOF_
start transaction;
-- ----------------------------------------------------------------------
-- SCHEMA $clname
-- ----------------------------------------------------------------------
create schema $clname;
-- ----------------------------------------------------------------------
-- TABLE sl_archive_tracking
-- ----------------------------------------------------------------------
create table $clname.sl_archive_tracking (
at_counter bigint,
at_created timestamp,
at_applied timestamp
);
-- -----------------------------------------------------------------------------
-- FUNCTION sequenceSetValue_offline (seq_id, last_value)
-- -----------------------------------------------------------------------------
create or replace function $clname.sequenceSetValue_offline(text,text, int8) returns int4
as '
declare
p_seq_nsp alias for \$1;
p_seq_name alias for \$2;
p_last_value alias for \$3;
begin
-- ----
-- Update it to the new value
-- ----
execute '' select setval(''''''|| p_seq_nsp || ''.'' ||
p_seq_name || '''''', '''''' || p_last_value || '''''')'';
return 0;
end;
' language plpgsql;
-- ---------------------------------------------------------------------------------------
-- FUNCTION finishTableAfterCopy(table_id)
-- ---------------------------------------------------------------------------------------
-- This can just be a simple stub function; it does not need to do anything...
-- ---------------------------------------------------------------------------------------
create or replace function $clname.finishTableAfterCopy(int4) returns int4 as
'select 1'
language sql;
-- ---------------------------------------------------------------------------------------
-- FUNCTION archiveTracking_offline (new_counter, created_timestamp)
-- ---------------------------------------------------------------------------------------
create or replace function $clname.archiveTracking_offline(int8, timestamp) returns int8
as '
declare
p_new_seq alias for \$1;
p_created alias for \$2;
v_exp_seq int8;
v_old_seq int8;
begin
select at_counter into v_old_seq from $clname.sl_archive_tracking;
if not found then
raise exception ''Slony-I: current archive tracking status not found'';
end if;
v_exp_seq := p_new_seq - 1;
if v_old_seq <> v_exp_seq then
raise exception ''Slony-I: node is on archive counter %, this archive log expects %'',
v_old_seq, v_exp_seq;
end if;
raise notice ''Slony-I: Process archive with counter % created %'', p_new_seq, p_created;
update $clname.sl_archive_tracking
set at_counter = p_new_seq,
at_created = p_created,
at_applied = CURRENT_TIMESTAMP;
return p_new_seq;
end;
' language plpgsql;
create table $clname.sl_log_archive (
log_origin int4,
log_txid bigint,
log_tableid int4,
log_actionseq int8,
log_tablenspname text,
log_tablerelname text,
log_cmdtype char,
log_cmdupdncols int4,
log_cmdargs text[]
) WITHOUT OIDS;
create or replace function $clname.slon_quote_brute(p_tab_fqname text) returns text
as \$\$
declare
v_fqname text default '';
begin
v_fqname := '"' || replace(p_tab_fqname,'"','""') || '"';
return v_fqname;
end;
\$\$ language plpgsql immutable;
create or replace function $clname.log_apply() returns trigger
as \$\$
declare
v_command text = 'not implemented yet';
v_list1 text = '';
v_list2 text = '';
v_comma text = '';
v_and text = '';
v_idx integer = 1;
v_nargs integer;
v_i integer = 0;
begin
v_nargs = array_upper(NEW.log_cmdargs, 1);
if NEW.log_cmdtype = 'I' then
while v_idx < v_nargs loop
v_list1 = v_list1 || v_comma ||
$clname.slon_quote_brute(NEW.log_cmdargs[v_idx]);
v_idx = v_idx + 1;
if NEW.log_cmdargs[v_idx] is null then
v_list2 = v_list2 || v_comma || 'null';
else
v_list2 = v_list2 || v_comma ||
pg_catalog.quote_literal(NEW.log_cmdargs[v_idx]); end if;
v_idx = v_idx + 1;
v_comma = ',';
end loop;
v_command = 'INSERT INTO ' ||
$clname.slon_quote_brute(NEW.log_tablenspname) || '.' ||
$clname.slon_quote_brute(NEW.log_tablerelname) || ' (' ||
v_list1 || ') VALUES (' || v_list2 || ')';
execute v_command;
end if;
if NEW.log_cmdtype = 'U' then
v_command = 'UPDATE ONLY ' ||
$clname.slon_quote_brute(NEW.log_tablenspname) || '.' ||
$clname.slon_quote_brute(NEW.log_tablerelname) || ' SET ';
while v_i < NEW.log_cmdupdncols loop
v_command = v_command || v_comma ||
$clname.slon_quote_brute(NEW.log_cmdargs[v_idx]) || '=';
v_idx = v_idx + 1;
if NEW.log_cmdargs[v_idx] is null then
v_command = v_command || 'null';
else
v_command = v_command ||
pg_catalog.quote_literal(NEW.log_cmdargs[v_idx]);
end if;
v_idx = v_idx + 1;
v_comma = ',';
v_i = v_i + 1;
end loop;
if NEW.log_cmdupdncols = 0 then
v_command = v_command ||
$clname.slon_quote_brute(NEW.log_cmdargs[1]) || '=' ||
$clname.slon_quote_brute(NEW.log_cmdargs[1]);
end if;
v_command = v_command || ' WHERE ';
while v_idx < v_nargs loop
v_command = v_command || v_and ||
$clname.slon_quote_brute(NEW.log_cmdargs[v_idx]) || '=';
v_idx = v_idx + 1;
if NEW.log_cmdargs[v_idx] is null then
v_command = v_command || 'null';
else
v_command = v_command ||
pg_catalog.quote_literal(NEW.log_cmdargs[v_idx]);
end if;
v_idx = v_idx + 1;
v_and = ' AND ';
end loop;
execute v_command;
end if;
if NEW.log_cmdtype = 'D' then
v_command = 'DELETE FROM ONLY ' ||
$clname.slon_quote_brute(NEW.log_tablenspname) || '.' ||
$clname.slon_quote_brute(NEW.log_tablerelname) || ' WHERE ';
while v_idx < v_nargs loop
v_command = v_command || v_and ||
$clname.slon_quote_brute(NEW.log_cmdargs[v_idx]) || '=';
v_idx = v_idx + 1;
if NEW.log_cmdargs[v_idx] is null then
v_command = v_command || 'null';
else
v_command = v_command ||
pg_catalog.quote_literal(NEW.log_cmdargs[v_idx]);
end if;
v_idx = v_idx + 1;
v_and = ' AND ';
end loop;
execute v_command;
end if;
if NEW.log_cmdtype = 'S' then
execute 'set session_replication_role to local;';
execute NEW.log_cmdargs[1];
execute 'set session_replication_role to replica;';
end if;
if NEW.log_cmdtype = 'T' then
execute 'TRUNCATE TABLE ONLY ' ||
$clname.slon_quote_brute(NEW.log_tablenspname) || '.' ||
$clname.slon_quote_brute(NEW.log_tablerelname) || ' CASCADE';
end if;
return NULL;
end;
\$\$ language plpgsql;
create trigger apply_trigger
before INSERT on $clname.sl_log_archive
for each row execute procedure $clname.log_apply();
alter table $clname.sl_log_archive
enable replica trigger apply_trigger;
set session_replication_role='replica';
_EOF_
if [ "$omit_copy" != "1" ]; then
for tab in $tables
do
eval tabname=\$tabname_$tab
echo "truncate $tabname cascade;";
done
fi
# ----
# The remainder of this script is written in a way that
# all output is generated by psql inside of one serializable
# transaction, so that we get a consistent snapshot of the
# replica.
# ----
(
echo "start transaction;"
echo "set transaction isolation level serializable;"
# ----
# Provide initial values for all sequences.
# ----
for seq in $sequences ; do
eval seqname=\$seqname_$seq
schema=`echo $seqname|cut -d'.' -f1`
name=`echo $seqname|cut -d'.' -f2`
echo "select E'select $clname.sequenceSetValue_offline(''$schema'',''$name'', ''' || last_value::text || E''');' from $seqname;"
done
# ----
# Fill the setsync tracking table with the current status
# ----
echo "select 'insert into $clname.sl_archive_tracking values (' ||
ac_num::text || ', ''' || ac_timestamp::text ||
''', CURRENT_TIMESTAMP);'
from $clname.sl_archive_counter;";
# ----
# Now dump all the user table data
# ----
if [ "$omit_copy" -eq "0" ]; then
system_type=`uname`
for tab in $tables ; do
eval tabname=\$tabname_$tab
# Get fieldnames...
fields=`psql -At -c "select $clname.copyfields($tab);" $dbname`
echo "select 'copy $tabname $fields from stdin;';"
echo "copy $tabname $fields to stdout;"
printf "select E'\\\\\\\\.';"
done
fi
# ----
# Commit the transaction here in the replica that provided us
# with the information.
# ----
echo "commit;"
) | psql -q -At -d $dbname
# ----
# Emit the commit for the dump to stdout.
# ----
echo "commit;"
exit 0
|