mirror of https://github.com/postgres/postgres
Apply patch from Steven Singer for contrib/dbmirror. Changes:
-It fixes up some bugs with handling setval calls -Adds upgrade instructions from prior versions -Improved the sample config file -Fixed some things in the clean_pending script
This commit is contained in:
Neil Conway
parent
ae7ea1395c
commit
87438cb90e
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@ -1,6 +1,5 @@
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BEGIN;
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SET autocommit TO 'on';
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CREATE FUNCTION "recordchange" () RETURNS trigger AS
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'$libdir/pending.so', 'recordchange' LANGUAGE 'C';
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@ -25,7 +24,7 @@ XID int4 NOT NULL,
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PRIMARY KEY (SeqId)
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);
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CREATE INDEX "dbmirror_Pending_XID_Index" ON dbmirror_Pending (XID);
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CREATE INDEX dbmirror_Pending_XID_Index ON dbmirror_Pending (XID);
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CREATE TABLE dbmirror_PendingData (
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SeqId int4 NOT NULL,
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@ -50,12 +49,14 @@ CASCADE ON DELETE CASCADE
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UPDATE pg_proc SET proname='nextval_pg' WHERE proname='nextval';
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CREATE FUNCTION pg_catalog.nextval(text) RETURNS int8 AS
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'/usr/local/postgresql-7.4/lib/pending.so', 'nextval' LANGUAGE 'C' STRICT;
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'$libdir/pending.so', 'nextval' LANGUAGE 'C' STRICT;
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UPDATE pg_proc set proname='setval_pg' WHERE proname='setval';
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CREATE FUNCTION pg_catalog.setval(text,int4) RETURNS int8 AS
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'/usr/local/postgresql-7.4/lib/pending.so', 'setval' LANGUAGE 'C' STRICT;
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CREATE FUNCTION pg_catalog.setval("unknown",integer,boolean) RETURNS int8 AS
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'$libdir/pending.so', 'setval' LANGUAGE 'C' STRICT;
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CREATE FUNCTION pg_catalog.setval("unknown",integer) RETURNS int8 AS
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'$libdir/pending.so', 'setval' LANGUAGE 'C' STRICT;
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COMMIT;
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@ -61,10 +61,29 @@ Requirments:
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-PgPerl (http://gborg.postgresql.org/project/pgperl/projdisplay.php)
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Upgrading from versions prior to 8.0
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---------------------------------------
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Users upgrading from a version of dbmirror prior to the one shipped with
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Postgresql 8.0 will need to perform the following steps
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1. Dump the database then drop it (dropdb no not use the -C option)
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2. Create database with createdb.
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3. Run psql databasename -f MirrorSetup.sql
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4. Restore the database(do not use the -C option of pg_dump/pg_restore)
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5. run the SQL commands: DROP "Pending";DROP "PendingData"; DROP "MirrorHost";
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DROP "MirroredTransaction";
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The above steps are needed A) Because the names of the tables used by dbmirror
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to store data have changed and B) In order for sequences to be mirrored properly
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all serial types must be recreated.
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Installation Instructions
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------------------------------------------------------------------------
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1) Compile pending.c
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The file pending.c contains the recordchange trigger. This runs every
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@ -16,7 +16,7 @@
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# GNU General Public License for more details.
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#
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##############################################################################
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# $PostgreSQL: pgsql/contrib/dbmirror/clean_pending.pl,v 1.4 2003/11/29 22:39:19 pgsql Exp $
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# $PostgreSQL: pgsql/contrib/dbmirror/clean_pending.pl,v 1.5 2004/09/10 04:31:06 neilc Exp $
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##############################################################################
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@ -77,13 +77,13 @@ unless($result->resultStatus == PGRES_COMMAND_OK) {
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#delete all transactions that have been sent to all mirrorhosts
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#or delete everything if no mirror hosts are defined.
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# Postgres takes the "SELECT COUNT(*) FROM "MirrorHost" and makes it into
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# Postgres takes the "SELECT COUNT(*) FROM dbmirror_MirrorHost and makes it into
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# an InitPlan. EXPLAIN show's this.
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my $deletePendingQuery = 'DELETE FROM "Pending" WHERE (SELECT ';
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$deletePendingQuery .= ' COUNT(*) FROM "MirroredTransaction" WHERE ';
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$deletePendingQuery .= ' "XID"="Pending"."XID") = (SELECT COUNT(*) FROM ';
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$deletePendingQuery .= ' "MirrorHost") OR (SELECT COUNT(*) FROM ';
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$deletePendingQuery .= ' "MirrorHost") = 0';
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my $deletePendingQuery = 'DELETE FROM dbmirror_Pending WHERE (SELECT ';
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$deletePendingQuery .= ' COUNT(*) FROM dbmirror_MirroredTransaction WHERE ';
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$deletePendingQuery .= ' XID=dbmirror_Pending.XID) = (SELECT COUNT(*) FROM ';
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$deletePendingQuery .= ' dbmirror_MirrorHost) OR (SELECT COUNT(*) FROM ';
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$deletePendingQuery .= ' dbmirror_MirrorHost) = 0';
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my $result = $dbConn->exec($deletePendingQuery);
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unless ($result->resultStatus == PGRES_COMMAND_OK ) {
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@ -91,15 +91,15 @@ unless ($result->resultStatus == PGRES_COMMAND_OK ) {
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die;
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}
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$dbConn->exec("COMMIT");
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$result = $dbConn->exec('VACUUM "Pending"');
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$result = $dbConn->exec('VACUUM dbmirror_Pending');
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unless ($result->resultStatus == PGRES_COMMAND_OK) {
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printf($dbConn->errorMessage);
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}
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$result = $dbConn->exec('VACUUM "PendingData"');
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$result = $dbConn->exec('VACUUM dbmirror_PendingData');
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unless($result->resultStatus == PGRES_COMMAND_OK) {
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printf($dbConn->errorMessage);
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}
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$result = $dbConn->exec('VACUUM "MirroredTransaction"');
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$result = $dbConn->exec('VACUUM dbmirror_MirroredTransaction');
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unless($result->resultStatus == PGRES_COMMAND_OK) {
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printf($dbConn->errorMessage);
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}
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@ -1,7 +1,7 @@
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/****************************************************************************
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* pending.c
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* $Id: pending.c,v 1.19 2004/08/29 05:06:35 momjian Exp $
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* $PostgreSQL: pgsql/contrib/dbmirror/pending.c,v 1.19 2004/08/29 05:06:35 momjian Exp $
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* $Id: pending.c,v 1.20 2004/09/10 04:31:06 neilc Exp $
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* $PostgreSQL: pgsql/contrib/dbmirror/pending.c,v 1.20 2004/09/10 04:31:06 neilc Exp $
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*
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* This file contains a trigger for Postgresql-7.x to record changes to tables
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* to a pending table for mirroring.
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@ -63,7 +63,7 @@ char *packageData(HeapTuple tTupleData, TupleDesc tTupleDecs, Oid tableOid,
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#define BUFFER_SIZE 256
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#define MAX_OID_LEN 10
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#define DEBUG_OUTPUT 1
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/*#define DEBUG_OUTPUT 1 */
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extern Datum recordchange(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(recordchange);
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@ -596,18 +596,28 @@ setval(PG_FUNCTION_ARGS)
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text *sequenceName;
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Oid setvalArgTypes[2] = {TEXTOID, INT4OID};
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Oid setvalArgTypes[3] = {TEXTOID, INT4OID,BOOLOID};
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int nextValue;
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void *setvalPlan = NULL;
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Datum setvalData[2];
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const char *setvalQuery = "SELECT setval_pg($1,$2)";
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Datum setvalData[3];
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const char *setvalQuery = "SELECT setval_pg($1,$2,$3)";
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int ret;
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char is_called;
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sequenceName = PG_GETARG_TEXT_P(0);
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nextValue = PG_GETARG_INT32(1);
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is_called = PG_GETARG_BOOL(2);
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setvalData[0] = PointerGetDatum(sequenceName);
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setvalData[1] = Int32GetDatum(nextValue);
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if(PG_NARGS() > 2)
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{
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setvalData[2] = BoolGetDatum(is_called);
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}
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else
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{
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setvalData[2]=1;
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}
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if (SPI_connect() < 0)
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{
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@ -616,7 +626,7 @@ setval(PG_FUNCTION_ARGS)
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return -1;
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}
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setvalPlan = SPI_prepare(setvalQuery, 2, setvalArgTypes);
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setvalPlan = SPI_prepare(setvalQuery, 3, setvalArgTypes);
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if (setvalPlan == NULL)
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{
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ereport(ERROR, (errcode(ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
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@ -4,7 +4,7 @@
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# It contains configuration information to mirror data from
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# the master database to a single slave system.
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#
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# $PostgreSQL: pgsql/contrib/dbmirror/slaveDatabase.conf,v 1.2 2003/11/29 22:39:19 pgsql Exp $
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# $PostgreSQL: pgsql/contrib/dbmirror/slaveDatabase.conf,v 1.3 2004/09/10 04:31:06 neilc Exp $
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#######################################################################
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$masterHost = "masterMachine.mydomain.com";
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@ -15,8 +15,21 @@ $masterPassword = "postgrespassword";
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# Where to email Error messages to
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# $errorEmailAddr = "me@mydomain.com";
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$slaveInfo->{"slaveName"} = "backupMachine";
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$slaveInfo->{"slaveHost"} = "backupMachine.mydomain.com";
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$slaveInfo->{"slaveDb"} = "myDatabase";
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$slaveInfo->{"slavePort"} = 5432;
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$slaveInfo->{"slaveUser"} = "postgres";
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$slaveInfo->{"slavePassword"} = "postgrespassword";
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# If uncommented then text files with SQL statements are generated instead
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# of connecting to the slave database directly.
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# slaveDb should then be commented out.
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# $slaveInfo{"TransactionFileDirectory"} = '/tmp';
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#
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# The number of seconds dbmirror should sleep for between checking to see
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# if more data is ready to be mirrored.
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$sleepInterval = 60;
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#If you want to use syslog
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# $syslog = 1;
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