Slony-I 2.2.7 Documentation
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# 8.138. upgradeschema(p_old text)

Function Properties

Language: PLPGSQL

Return Type: text

Called during "update functions" by slonik to perform schema changes

    declare
    	v_tab_row	record;
    	v_query text;
    	v_keepstatus text;
    begin
    	-- If old version is pre-2.0, then we require a special upgrade process
    	if p_old like '1.%' then
    		raise exception 'Upgrading to Slony-I 2.x requires running slony_upgrade_20';
    	end if;

    	perform upgradeSchemaAddTruncateTriggers();

    	-- Change all Slony-I-defined columns that are "timestamp without time zone" to "timestamp *WITH* time zone"
    	if exists (select 1 from information_schema.columns c
                where table_schema = '_schemadoc' and data_type = 'timestamp without time zone'
    	    and exists (select 1 from information_schema.tables t where t.table_schema = c.table_schema and t.table_name = c.table_name and t.table_type = 'BASE TABLE')
    		and (c.table_name, c.column_name) in (('sl_confirm', 'con_timestamp'), ('sl_event', 'ev_timestamp'), ('sl_registry', 'reg_timestamp'),('sl_archive_counter', 'ac_timestamp')))
    	then

    	  -- Preserve sl_status
    	  select pg_get_viewdef('sl_status') into v_keepstatus;
    	  execute 'drop view sl_status';
    	  for v_tab_row in select table_schema, table_name, column_name from information_schema.columns c
                where table_schema = '_schemadoc' and data_type = 'timestamp without time zone'
    	    and exists (select 1 from information_schema.tables t where t.table_schema = c.table_schema and t.table_name = c.table_name and t.table_type = 'BASE TABLE')
    		and (table_name, column_name) in (('sl_confirm', 'con_timestamp'), ('sl_event', 'ev_timestamp'), ('sl_registry', 'reg_timestamp'),('sl_archive_counter', 'ac_timestamp'))
    	  loop
    		raise notice 'Changing Slony-I column [%.%] to timestamp WITH time zone', v_tab_row.table_name, v_tab_row.column_name;
    		v_query := 'alter table ' || slon_quote_brute(v_tab_row.table_schema) ||
                       '.' || v_tab_row.table_name || ' alter column ' || v_tab_row.column_name ||
                       ' type timestamp with time zone;';
    		execute v_query;
    	  end loop;
    	  -- restore sl_status
    	  execute 'create view sl_status as ' || v_keepstatus;
            end if;

    	if not exists (select 1 from information_schema.tables where table_schema = '_schemadoc' and table_name = 'sl_components') then
    	   v_query := '
    create table sl_components (
    	co_actor	 text not null primary key,
    	co_pid		 integer not null,
    	co_node		 integer not null,
    	co_connection_pid integer not null,
    	co_activity	  text,
    	co_starttime	  timestamptz not null,
    	co_event	  bigint,
    	co_eventtype 	  text
    ) without oids;
    ';
      	   execute v_query;
    	end if;

    	if not exists (select 1 from information_schema.tables t where table_schema = '_schemadoc' and table_name = 'sl_event_lock') then
    	   v_query := 'create table sl_event_lock (dummy integer);';
    	   execute v_query;
            end if;

    	if not exists (select 1 from information_schema.tables t
    			where table_schema = '_schemadoc'
    			and table_name = 'sl_apply_stats') then
    		v_query := '
    			create table sl_apply_stats (
    				as_origin			int4,
    				as_num_insert		int8,
    				as_num_update		int8,
    				as_num_delete		int8,
    				as_num_truncate		int8,
    				as_num_script		int8,
    				as_num_total		int8,
    				as_duration			interval,
    				as_apply_first		timestamptz,
    				as_apply_last		timestamptz,
    				as_cache_prepare	int8,
    				as_cache_hit		int8,
    				as_cache_evict		int8,
    				as_cache_prepare_max int8
    			) WITHOUT OIDS;';
    		execute v_query;
    	end if;

    	--
    	-- On the upgrade to 2.2, we change the layout of sl_log_N by
    	-- adding columns log_tablenspname, log_tablerelname, and
    	-- log_cmdupdncols as well as changing log_cmddata into
    	-- log_cmdargs, which is a text array.
    	--
    	if not check_table_field_exists('_schemadoc', 'sl_log_1', 'log_cmdargs') then
    		--
    		-- Check that the cluster is completely caught up
    		--
    		if check_unconfirmed_log() then
    			raise EXCEPTION 'cannot upgrade to new sl_log_N format due to existing unreplicated data';
    		end if;

    		--
    		-- Drop tables sl_log_1 and sl_log_2
    		--
    		drop table sl_log_1;
    		drop table sl_log_2;

    		--
    		-- Create the new sl_log_1
    		--
    		create table sl_log_1 (
    			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 index sl_log_1_idx1 on sl_log_1
    			(log_origin, log_txid, log_actionseq);

    		comment on table sl_log_1 is 'Stores each change to be propagated to subscriber nodes';
    		comment on column sl_log_1.log_origin is 'Origin node from which the change came';
    		comment on column sl_log_1.log_txid is 'Transaction ID on the origin node';
    		comment on column sl_log_1.log_tableid is 'The table ID (from sl_table.tab_id) that this log entry is to affect';
    		comment on column sl_log_1.log_actionseq is 'The sequence number in which actions will be applied on replicas';
    		comment on column sl_log_1.log_tablenspname is 'The schema name of the table affected';
    		comment on column sl_log_1.log_tablerelname is 'The table name of the table affected';
    		comment on column sl_log_1.log_cmdtype is 'Replication action to take. U = Update, I = Insert, D = DELETE, T = TRUNCATE';
    		comment on column sl_log_1.log_cmdupdncols is 'For cmdtype=U the number of updated columns in cmdargs';
    		comment on column sl_log_1.log_cmdargs is 'The data needed to perform the log action on the replica';

    		--
    		-- Create the new sl_log_2
    		--
    		create table sl_log_2 (
    			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 index sl_log_2_idx1 on sl_log_2
    			(log_origin, log_txid, log_actionseq);

    		comment on table sl_log_2 is 'Stores each change to be propagated to subscriber nodes';
    		comment on column sl_log_2.log_origin is 'Origin node from which the change came';
    		comment on column sl_log_2.log_txid is 'Transaction ID on the origin node';
    		comment on column sl_log_2.log_tableid is 'The table ID (from sl_table.tab_id) that this log entry is to affect';
    		comment on column sl_log_2.log_actionseq is 'The sequence number in which actions will be applied on replicas';
    		comment on column sl_log_2.log_tablenspname is 'The schema name of the table affected';
    		comment on column sl_log_2.log_tablerelname is 'The table name of the table affected';
    		comment on column sl_log_2.log_cmdtype is 'Replication action to take. U = Update, I = Insert, D = DELETE, T = TRUNCATE';
    		comment on column sl_log_2.log_cmdupdncols is 'For cmdtype=U the number of updated columns in cmdargs';
    		comment on column sl_log_2.log_cmdargs is 'The data needed to perform the log action on the replica';

    		create table sl_log_script (
    			log_origin			int4,
    			log_txid			bigint,
    			log_actionseq		int8,
    			log_cmdtype			"char",
    			log_cmdargs			text[]
    			) WITHOUT OIDS;
    		create index sl_log_script_idx1 on sl_log_script
    		(log_origin, log_txid, log_actionseq);

    		comment on table sl_log_script is 'Captures SQL script queries to be propagated to subscriber nodes';
    		comment on column sl_log_script.log_origin is 'Origin name from which the change came';
    		comment on column sl_log_script.log_txid is 'Transaction ID on the origin node';
    		comment on column sl_log_script.log_actionseq is 'The sequence number in which actions will be applied on replicas';
    		comment on column sl_log_2.log_cmdtype is 'Replication action to take. S = Script statement, s = Script complete';
    		comment on column sl_log_script.log_cmdargs is 'The DDL statement, optionally followed by selected nodes to execute it on.';

    		--
    		-- Put the log apply triggers back onto sl_log_1/2
    		--
    		create trigger apply_trigger
    			before INSERT on sl_log_1
    			for each row execute procedure logApply('_schemadoc');
    		alter table sl_log_1
    			enable replica trigger apply_trigger;
    		create trigger apply_trigger
    			before INSERT on sl_log_2
    			for each row execute procedure logApply('_schemadoc');
    		alter table sl_log_2
    			enable replica trigger apply_trigger;
    	end if;
    	if not exists (select 1 from information_schema.routines where routine_schema = '_schemadoc' and routine_name = 'string_agg') then
    	       CREATE AGGREGATE string_agg(text) (
    	   	      SFUNC=agg_text_sum,
    		      STYPE=text,
    		      INITCOND=''
    		      );
    	end if;
    	if not exists (select 1 from information_schema.views where table_schema='_schemadoc' and table_name='sl_failover_targets') then
    	   create view sl_failover_targets as
    	   	  select  set_id,
    		  set_origin as set_origin,
    		  sub1.sub_receiver as backup_id

    		  FROM
    		  sl_subscribe sub1
    		  ,sl_set set1
    		  where
     		  sub1.sub_set=set_id
    		  and sub1.sub_forward=true
    		  --exclude candidates where the set_origin
    		  --has a path a node but the failover
    		  --candidate has no path to that node
    		  and sub1.sub_receiver not in
    	    	  (select p1.pa_client from
    	    	  sl_path p1
    	    	  left outer join sl_path p2 on
    	    	  (p2.pa_client=p1.pa_client
    	    	  and p2.pa_server=sub1.sub_receiver)
    	    	  where p2.pa_client is null
    	    	  and p1.pa_server=set_origin
    	    	  and p1.pa_client<>sub1.sub_receiver
    	    	  )
    		  and sub1.sub_provider=set_origin
    		  --exclude any subscribers that are not
    		  --direct subscribers of all sets on the
    		  --origin
    		  and sub1.sub_receiver not in
    		  (select direct_recv.sub_receiver
    		  from

    			(--all direct receivers of the first set
    			select subs2.sub_receiver
    			from sl_subscribe subs2
    			where subs2.sub_provider=set1.set_origin
    		      	and subs2.sub_set=set1.set_id) as
    		      	direct_recv
    			inner join
    			(--all other sets from the origin
    			select set_id from sl_set set2
    			where set2.set_origin=set1.set_origin
    			and set2.set_id<>sub1.sub_set)
    			as othersets on(true)
    			left outer join sl_subscribe subs3
    			on(subs3.sub_set=othersets.set_id
    		   	and subs3.sub_forward=true
    		   	and subs3.sub_provider=set1.set_origin
    		   	and direct_recv.sub_receiver=subs3.sub_receiver)
    	    		where subs3.sub_receiver is null
    	    	);
    	end if;

    	if not check_table_field_exists('_schemadoc', 'sl_node', 'no_failed') then
    	   alter table sl_node add column no_failed bool;
    	   update sl_node set no_failed=false;
    	end if;
    	return p_old;
    end;

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