It includes
-Support for mirroring tables in different Schema's -Improved documentation for compiling with 7.1.x and 7.2.x -Fixes a buffer overrun bug. Steven Singer
This commit is contained in:
Bruce Momjian
parent
cabad378fc
commit
8e6b5c8b27
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@ -19,7 +19,7 @@
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# GNU General Public License for more details.
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#
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##############################################################################
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# $Id: DBMirror.pl,v 1.2 2002/10/18 18:41:19 momjian Exp $
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# $Id: DBMirror.pl,v 1.3 2002/10/19 02:16:40 momjian Exp $
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#
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##############################################################################
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@ -387,7 +387,7 @@ sub mirrorInsert($$$$$) {
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#Now build the insert query.
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my $insertQuery = "INSERT INTO \"$tableName\" (";
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my $insertQuery = "INSERT INTO $tableName (";
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my $valuesQuery = ") VALUES (";
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foreach $column (keys (%recordValues)) {
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if($firstIteration==0) {
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@ -468,7 +468,7 @@ sub mirrorDelete($$$$$) {
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%dataHash = extractData($pendingResult,$currentTuple);
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my $counter=0;
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my $deleteQuery = "DELETE FROM \"$tableName\" WHERE ";
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my $deleteQuery = "DELETE FROM $tableName WHERE ";
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foreach $currentField (keys %dataHash) {
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if($firstField==0) {
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$deleteQuery .= " AND ";
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@ -553,7 +553,7 @@ sub mirrorUpdate($$$$$) {
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my $counter;
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my $quotedValue;
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my $updateQuery = "UPDATE \"$tableName\" SET ";
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my $updateQuery = "UPDATE $tableName SET ";
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my $currentField;
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@ -6,7 +6,8 @@ CREATE FUNCTION "recordchange" () RETURNS trigger AS
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CREATE TABLE "MirrorHost" (
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"MirrorHostId" serial,
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"HostName" varchar NOT NULL
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"HostName" varchar NOT NULL,
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PRIMARY KEY("MirrorHostId")
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);
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@ -46,6 +46,7 @@ Pending tables.
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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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@ -54,20 +55,35 @@ time a row inside of a table being mirrored changes.
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To build the trigger run make on the "Makefile" in the DBMirror directory.
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The Makefile supplied assumes that the postgres include files are in
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/usr/local/pgsql/include/server.
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Postgres-7.3 Make Instructions:
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If you have already run "configure" in the pgsql-server directory
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then run "make" in the dbmirror directory to compile the trigger.
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Postgres-7.1 & Postgres-7.2 Make Instructions:
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The included Makefile is not compatible with postgres 7.1 and 7.2
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The trigger will need to be built by hand.
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Run the following commands
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gcc -fpic -I/usr/local/pgsql/include/server -c pending.c -DNOSCHEMAS
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ld -shared -o pending.so pending.o
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Assuming the postgres include files are in /usr/local/pgsql/include/server.
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Postgres-7.1.x installations should change this to
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/usr/local/pgsql/include (The server part is for 7.2+)
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If you have installed the postgres include files to another location then
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modify the Makefile to reflect this.
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modify the include path to reflect this.
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The trigger requires that all postgres headers be installed, this is
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accomplished in postgresql(7.1 or 7.2) by running "make install-all-headers"
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in the postgres source directory.
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Compiling the trigger by hand requires that all postgres headers be installed
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,this is accomplished in postgresql(7.1 or 7.2) by running
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"make install-all-headers" in the postgres source directory.
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The Makefile should create a file named pending.so that contains the trigger.
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You should now have a file named pending.so that contains the trigger.
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Install this file in /usr/local/pgsql/lib (or another suitable location).
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@ -93,6 +109,15 @@ To execute the script use psql as follows
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where MyDatabaseName is the name of the database you wish to install mirroring
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on(Your master).
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Postgres-7.1 and 7.2 Notes:
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-The syntax for creating a trigger function changed in Postgres-7.3.
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Change the line in MirrorSetup.sql from
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CREATE FUNCTION "recordchange" () RETURNS trigger AS
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to
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CREATE FUNCTION "recordchange" () RETURNS OPAQUE AS
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3) Create slaveDatabase.conf files.
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@ -199,6 +224,7 @@ RedHat Linux 7.1 & 6.2
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Mandrake Linux 8.0(Limited Testing)
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-Postgres 7.2
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-Postgres 7.3
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-Perl 5.6
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@ -1,6 +1,6 @@
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/****************************************************************************
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* pending.c
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* $Id: pending.c,v 1.5 2002/09/26 05:24:30 momjian Exp $
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* $Id: pending.c,v 1.6 2002/10/19 02:16:40 momjian 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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@ -22,7 +22,7 @@
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#include <executor/spi.h>
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#include <commands/trigger.h>
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#include <utils/lsyscache.h>
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enum FieldUsage
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{
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PRIMARY = 0, NONPRIMARY, ALL, NUM_FIELDUSAGE
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@ -46,7 +46,7 @@ char *packageData(HeapTuple tTupleData, TupleDesc tTupleDecs,
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#define BUFFER_SIZE 256
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#define MAX_OID_LEN 10
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#define DEBUG_OUTPUT
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extern Datum recordchange(PG_FUNCTION_ARGS);
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@ -69,7 +69,8 @@ recordchange(PG_FUNCTION_ARGS)
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HeapTuple retTuple = NULL;
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char *tblname;
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char op = 0;
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char *schemaname;
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char *fullyqualtblname;
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if (fcinfo->context != NULL)
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{
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@ -81,6 +82,16 @@ recordchange(PG_FUNCTION_ARGS)
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trigdata = (TriggerData *) fcinfo->context;
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/* Extract the table name */
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tblname = SPI_getrelname(trigdata->tg_relation);
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#ifndef NOSCHEMAS
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schemaname = get_namespace_name(RelationGetNamespace(trigdata->tg_relation));
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fullyqualtblname = SPI_palloc(strlen(tblname) +
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strlen(schemaname) + 4);
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sprintf(fullyqualtblname,"\"%s\".\"%s\"",
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schemaname,tblname);
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#else
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fullyqualtblname = SPI_palloc(strlen(tblname+3));
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sprintf(fullyqualtblname,"\"%s\"",tblname);
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#endif
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tupdesc = trigdata->tg_relation->rd_att;
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if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
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{
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@ -103,7 +114,7 @@ recordchange(PG_FUNCTION_ARGS)
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op = 'd';
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}
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if (storePending(tblname, beforeTuple, afterTuple, tupdesc, trigdata, op))
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if (storePending(fullyqualtblname, beforeTuple, afterTuple, tupdesc, trigdata, op))
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{
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/* An error occoured. Skip the operation. */
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elog(ERROR, "Operation could not be mirrored");
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@ -113,6 +124,7 @@ recordchange(PG_FUNCTION_ARGS)
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#if defined DEBUG_OUTPUT
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elog(NOTICE, "Returning on success");
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#endif
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SPI_pfree(fullyqualtblname);
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SPI_finish();
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return PointerGetDatum(retTuple);
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}
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@ -417,7 +429,7 @@ packageData(HeapTuple tTupleData, TupleDesc tTupleDesc,
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#if defined DEBUG_OUTPUT
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elog(NOTICE, cpFieldName);
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#endif
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while (iDataBlockSize - iUsedDataBlock < strlen(cpFieldName) + 4)
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while (iDataBlockSize - iUsedDataBlock < strlen(cpFieldName) + 6)
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{
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cpDataBlock = SPI_repalloc(cpDataBlock, iDataBlockSize + BUFFER_SIZE);
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iDataBlockSize = iDataBlockSize + BUFFER_SIZE;
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@ -436,7 +448,7 @@ packageData(HeapTuple tTupleData, TupleDesc tTupleDesc,
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}
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else
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{
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*cpFormatedPtr = ' ';
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sprintf(cpFormatedPtr," ");
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iUsedDataBlock++;
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cpFormatedPtr++;
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continue;
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@ -484,7 +496,8 @@ packageData(HeapTuple tTupleData, TupleDesc tTupleDesc,
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if (tpPKeys != NULL)
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SPI_pfree(tpPKeys);
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#if defined DEBUG_OUTPUT
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elog(NOTICE, "Returning");
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elog(NOTICE, "Returning: DataBlockSize:%d iUsedDataBlock:%d",iDataBlockSize,
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iUsedDataBlock);
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#endif
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memset(cpDataBlock + iUsedDataBlock, 0, iDataBlockSize - iUsedDataBlock);
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