Problem
In our environment we use SQL Server merge replication to replicate data to multiple subscribers. We had a situation where a table needs to be part of merge replication and the table has more than 246 columns. Merge replication supports tables with maximum of 246 columns. In this article let us see how to replicate a table with more than 246 columns.
Solution
Merge replication is used to replicate data both ways i.e. data is sent from publisher to subscribers and vice versa.
In our database we have few tables which has more than 246 columns and they should be part of replication. But, merge replication allows tables with columns not more than 246. So, we created an intermediate table and put all the columns data in the form of xml and replicated intermediate table instead of main table.
To explain this, I am creating a sample table “TEST” with more than 246 columns and an intermediate table “TEST_INT”.
Main table: TEST
Intermediate table: TEST_INT
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CREATE TABLE TEST( ID INT Primary KEY, COL1 INT, COL2 INT, COL3 INT, COL4 INT, COL5 INT, COL6 INT, COL7 INT, COL8 INT, COL9 INT, COL10 INT, COL11 INT, COL12 INT, COL13 INT, COL14 INT, COL15 INT, COL16 INT, COL17 INT, COL18 INT, COL19 INT, COL20 INT, COL21 INT, COL22 INT, COL23 INT, COL24 INT, COL25 INT, COL26 INT, COL27 INT, COL28 INT, COL29 INT, COL30 INT, COL31 INT, COL32 INT, COL33 INT, COL34 INT, COL35 INT, COL36 INT, COL37 INT, COL38 INT, COL39 INT, COL40 INT, COL41 INT, COL42 INT, COL43 INT, COL44 INT, COL45 INT, COL46 INT, COL47 INT, COL48 INT, COL49 INT, COL50 INT, COL51 INT, COL52 INT, COL53 INT, COL54 INT, COL55 INT, COL56 INT, COL57 INT, COL58 INT, COL59 INT, COL60 INT, COL61 INT, COL62 INT, COL63 INT, COL64 INT, COL65 INT, COL66 INT, COL67 INT, COL68 INT, COL69 INT, COL70 INT, COL71 INT, COL72 INT, COL73 INT, COL74 INT, COL75 INT, COL76 INT, COL77 INT, COL78 INT, COL79 INT, COL80 INT, COL81 INT, COL82 INT, COL83 INT, COL84 INT, COL85 INT, COL86 INT, COL87 INT, COL88 INT, COL89 INT, COL90 INT, COL91 INT, COL92 INT, COL93 INT, COL94 INT, COL95 INT, COL96 INT, COL97 INT, COL98 INT, COL99 INT, COL100 INT, COL101 INT, COL102 INT, COL103 INT, COL104 INT, COL105 INT, COL106 INT, COL107 INT, COL108 INT, COL109 INT, COL110 INT, COL111 INT, COL112 INT, COL113 INT, COL114 INT, COL115 INT, COL116 INT, COL117 INT, COL118 INT, COL119 INT, COL120 INT, COL121 INT, COL122 INT, COL123 INT, COL124 INT, COL125 INT, COL126 INT, COL127 INT, COL128 INT, COL129 INT, COL130 INT, COL131 INT, COL132 INT, COL133 INT, COL134 INT, COL135 INT, COL136 INT, COL137 INT, COL138 INT, COL139 INT, COL140 INT, COL141 INT, COL142 INT, COL143 INT, COL144 INT, COL145 INT, COL146 INT, COL147 INT, COL148 INT, COL149 INT, COL150 INT, COL151 INT, COL152 INT, COL153 INT, COL154 INT, COL155 INT, COL156 INT, COL157 INT, COL158 INT, COL159 INT, COL160 INT, COL161 INT, COL162 INT, COL163 INT, COL164 INT, COL165 INT, COL166 INT, COL167 INT, COL168 INT, COL169 INT, COL170 INT, COL171 INT, COL172 INT, COL173 INT, COL174 INT, COL175 INT, COL176 INT, COL177 INT, COL178 INT, COL179 INT, COL180 INT, COL181 INT, COL182 INT, COL183 INT, COL184 INT, COL185 INT, COL186 INT, COL187 INT, COL188 INT, COL189 INT, COL190 INT, COL191 INT, COL192 INT, COL193 INT, COL194 INT, COL195 INT, COL196 INT, COL197 INT, COL198 INT, COL199 INT, COL200 INT, COL201 INT, COL202 INT, COL203 INT, COL204 INT, COL205 INT, COL206 INT, COL207 INT, COL208 INT, COL209 INT, COL210 INT, COL211 INT, COL212 INT, COL213 INT, COL214 INT, COL215 INT, COL216 INT, COL217 INT, COL218 INT, COL219 INT, COL220 INT, COL221 INT, COL222 INT, COL223 INT, COL224 INT, COL225 INT, COL226 INT, COL227 INT, COL228 INT, COL229 INT, COL230 INT, COL231 INT, COL232 INT, COL233 INT, COL234 INT, COL235 INT, COL236 INT, COL237 INT, COL238 INT, COL239 INT, COL240 INT, COL241 INT, COL242 INT, COL243 INT, COL244 INT, COL245 INT, COL246 INT, COL247 INT, COL248 INT, COL249 INT, COL250 INT, COL251 INT, COL252 INT, COL253 INT, COL254 INT, COL255 INT, COL256 INT, COL257 INT ) |
Create intermediate table “TEST_INT”.
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CREATE TABLE TEST_INT (ID INT PRIMARY KEY, XMLDATA NVARCHAR(MAX), DATECREATED DATETIME, DATEUPDATED DATETIME ) |
Triggers:
Now we need to create three triggers on the main table “TEST” which inserts, updates, deletes records on intermediate table “TEST_INT”.
All these triggers on main table “TEST” should be fired only when user perform DML operations and not replication agent. So, we need to mark these three triggers as “NOT FOR REPLICATION” or we can use sessionproperty(‘replication_agent’) to determine if it is a user operation or replication agent operation.
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SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TRIGGER [dbo].[INS_TST] ON [dbo].[TEST] FOR INSERT NOT FOR REPLICATION AS BEGIN SET NOCOUNT ON DECLARE @isrepl SQL_VARIANT -- Return if it is a replication agent SELECT @isrepl = sessionproperty('replication_agent') IF (@isrepl = 1) BEGIN RETURN; END DECLARE @id INT DECLARE cIdCreated CURSOR FOR SELECT ID FROM INSERTED OPEN cIdCreated FETCH NEXT FROM cIdCreated INTO @id WHILE @@FETCH_STATUS = 0 BEGIN INSERT INTO TEST_INT ( ID ,XMLDATA ,DATECREATED ,DATEUPDATED ) VALUES ( @id ,( SELECT * FROM TEST WHERE ID = @id FOR XML PATH('Data') ) ,getdate() ,getdate() ); FETCH NEXT FROM cIdCreated INTO @id END CLOSE cIdCreated DEALLOCATE cIdCreated END SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER OFF GO CREATE TRIGGER [dbo].[UPD_TEST] ON [dbo].[TEST] FOR UPDATE NOT FOR REPLICATION AS BEGIN SET NOCOUNT ON DECLARE @isrepl SQL_VARIANT -- Return if it is a replication agent SELECT @isrepl = sessionproperty('replication_agent') IF (@isrepl = 1) BEGIN RETURN; END DECLARE @id INT DECLARE cIdUpdated CURSOR FOR SELECT ID FROM INSERTED; OPEN cIdUpdated FETCH NEXT FROM cIdUpdated INTO @id WHILE @@FETCH_STATUS = 0 BEGIN IF EXISTS(select 1 from TEST_INT WHERE ID =@id) BEGIN UPDATE TEST_INT SET XMLDATA = ( SELECT * FROM TEST WHERE ID = @id FOR XML PATH('Data') ) ,DATEUPDATED = getdate() WHERE ID = @id; FETCH NEXT FROM cIdUpdated INTO @id END ELSE BEGIN INSERT INTO TEST_INT ( ID ,XMLDATA ,DATECREATED ,DATEUPDATED ) VALUES ( @id ,( SELECT * FROM TEST WHERE ID = @id FOR XML PATH('Data') ) ,getdate() ,getdate() ); END END CLOSE cIdUpdated DEALLOCATE cIdUpdated END GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TRIGGER [dbo].[DEL_TST] ON [dbo].[TEST] FOR DELETE NOT FOR REPLICATION AS BEGIN SET NOCOUNT ON DECLARE @isrepl SQL_VARIANT -- Return if it is a replication agent SELECT @isrepl = sessionproperty('replication_agent') IF (@isrepl = 1) BEGIN RETURN; END DECLARE @id INT DECLARE cIdDeleted CURSOR FOR SELECT ID FROM deleted OPEN cIdDeleted FETCH NEXT FROM cIdDeleted INTO @id WHILE @@FETCH_STATUS = 0 BEGIN DELETE FROM TEST_INT WHERE ID=@id FETCH NEXT FROM cIdDeleted INTO @id END CLOSE cIdDeleted DEALLOCATE cIdDeleted END GO |
We need create three triggers on intermediate table “TEST_INT” for insert, update and delete which inserts, updates and deletes data back on main table “TEST”. These three triggers on intermediate table should fire only when replication agent performs DML operation not the actual user. So, we can include sessionproperty(‘replication_agent’) in the trigger code to check if it is replication agent or not.
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SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TRIGGER [dbo].[DEL_TEST_INT] ON [dbo].[TEST_INT] FOR DELETE AS BEGIN SET NOCOUNT ON DECLARE @isrepl SQL_VARIANT -- RETURN IF USER DELETES -- SELECT @isrepl = sessionproperty('replication_agent') IF (@isrepl = 0) BEGIN RETURN; END DECLARE @id int DECLARE CIdDeleted CURSOR LOCAL FOR SELECT ID FROM DELETED OPEN CIdDeleted FETCH NEXT FROM CIdDeleted into @id WHILE @@FETCH_STATUS = 0 BEGIN DELETE FROM TEST WHERE ID =@id FETCH NEXT FROM CIdDeleted into @id END CLOSE CIdDeleted DEALLOCATE CIdDeleted END GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TRIGGER [dbo].[INS_TEST_INT] ON [dbo].[TEST_INT] FOR INSERT AS BEGIN SET NOCOUNT ON DECLARE @ID INT, @idoc int, @vXML NVARCHAR(MAX) -- RETURN IF USER INSERT DATA -- declare @isrepl sql_variant select @isrepl= sessionproperty('replication_agent') if (@isrepl=0) begin RETURN; end DECLARE CIdInserted CURSOR FOR SELECT ID,CAST(XMLDATA AS NVARCHAR(MAX)) FROM INSERTED; OPEN CIdInserted FETCH NEXT FROM CIdInserted INTO @id,@vXML WHILE @@FETCH_STATUS = 0 BEGIN EXEC sp_xml_preparedocument @idoc OUTPUT, @vXML INSERT INTO TEST(ID,COL1,COL2,COL3,COL4,COL5,COL6,COL7,COL8,COL9,COL10,COL11,COL12,COL13,COL14,COL15,COL16,COL17,COL18,COL19,COL20,COL21,COL22,COL23,COL24,COL25,COL26,COL27,COL28,COL29,COL30,COL31,COL32,COL33,COL34,COL35,COL36,COL37,COL38,COL39,COL40,COL41,COL42,COL43,COL44,COL45,COL46,COL47,COL48,COL49,COL50,COL51,COL52,COL53,COL54,COL55,COL56,COL57,COL58,COL59,COL60,COL61,COL62,COL63,COL64,COL65,COL66,COL67,COL68,COL69,COL70,COL71,COL72,COL73,COL74,COL75,COL76,COL77,COL78,COL79,COL80,COL81,COL82,COL83,COL84,COL85,COL86,COL87,COL88,COL89,COL90,COL91,COL92,COL93,COL94,COL95,COL96,COL97,COL98,COL99,COL100,COL101,COL102,COL103,COL104,COL105,COL106,COL107,COL108,COL109,COL110,COL111,COL112,COL113,COL114,COL115,COL116,COL117,COL118,COL119,COL120,COL121,COL122,COL123,COL124,COL125,COL126,COL127,COL128,COL129,COL130,COL131,COL132,COL133,COL134,COL135,COL136,COL137,COL138,COL139,COL140,COL141,COL142,COL143,COL144,COL145,COL146,COL147,COL148,COL149,COL150,COL151,COL152,COL153,COL154,COL155,COL156,COL157,COL158,COL159,COL160,COL161,COL162,COL163,COL164,COL165,COL166,COL167,COL168,COL169,COL170,COL171,COL172,COL173,COL174,COL175,COL176,COL177,COL178,COL179,COL180,COL181,COL182,COL183,COL184,COL185,COL186,COL187,COL188,COL189,COL190,COL191,COL192,COL193,COL194,COL195,COL196,COL197,COL198,COL199,COL200,COL201,COL202,COL203,COL204,COL205,COL206,COL207,COL208,COL209,COL210,COL211,COL212,COL213,COL214,COL215,COL216,COL217,COL218,COL219,COL220,COL221,COL222,COL223,COL224,COL225,COL226,COL227,COL228,COL229,COL230,COL231,COL232,COL233,COL234,COL235,COL236,COL237,COL238,COL239,COL240,COL241,COL242,COL243,COL244,COL245,COL246,COL247,COL248,COL249,COL250,COL251,COL252,COL253,COL254,COL255,COL256,COL257) SELECT ID,COL1,COL2,COL3,COL4,COL5,COL6,COL7,COL8,COL9,COL10,COL11,COL12,COL13,COL14,COL15,COL16,COL17,COL18,COL19,COL20,COL21,COL22,COL23,COL24,COL25,COL26,COL27,COL28,COL29,COL30,COL31,COL32,COL33,COL34,COL35,COL36,COL37,COL38,COL39,COL40,COL41,COL42,COL43,COL44,COL45,COL46,COL47,COL48,COL49,COL50,COL51,COL52,COL53,COL54,COL55,COL56,COL57,COL58,COL59,COL60,COL61,COL62,COL63,COL64,COL65,COL66,COL67,COL68,COL69,COL70,COL71,COL72,COL73,COL74,COL75,COL76,COL77,COL78,COL79,COL80,COL81,COL82,COL83,COL84,COL85,COL86,COL87,COL88,COL89,COL90,COL91,COL92,COL93,COL94,COL95,COL96,COL97,COL98,COL99,COL100,COL101,COL102,COL103,COL104,COL105,COL106,COL107,COL108,COL109,COL110,COL111,COL112,COL113,COL114,COL115,COL116,COL117,COL118,COL119,COL120,COL121,COL122,COL123,COL124,COL125,COL126,COL127,COL128,COL129,COL130,COL131,COL132,COL133,COL134,COL135,COL136,COL137,COL138,COL139,COL140,COL141,COL142,COL143,COL144,COL145,COL146,COL147,COL148,COL149,COL150,COL151,COL152,COL153,COL154,COL155,COL156,COL157,COL158,COL159,COL160,COL161,COL162,COL163,COL164,COL165,COL166,COL167,COL168,COL169,COL170,COL171,COL172,COL173,COL174,COL175,COL176,COL177,COL178,COL179,COL180,COL181,COL182,COL183,COL184,COL185,COL186,COL187,COL188,COL189,COL190,COL191,COL192,COL193,COL194,COL195,COL196,COL197,COL198,COL199,COL200,COL201,COL202,COL203,COL204,COL205,COL206,COL207,COL208,COL209,COL210,COL211,COL212,COL213,COL214,COL215,COL216,COL217,COL218,COL219,COL220,COL221,COL222,COL223,COL224,COL225,COL226,COL227,COL228,COL229,COL230,COL231,COL232,COL233,COL234,COL235,COL236,COL237,COL238,COL239,COL240,COL241,COL242,COL243,COL244,COL245,COL246,COL247,COL248,COL249,COL250,COL251,COL252,COL253,COL254,COL255,COL256,COL257 FROM OPENXML (@idoc, '/Data', 2) WITH (ID int, COL1 int, COL2 int, COL3 int, COL4 int, COL5 int, COL6 int, COL7 int, COL8 int, COL9 int, COL10 int, COL11 int, COL12 int, COL13 int, COL14 int, COL15 int, COL16 int, COL17 int, COL18 int, COL19 int, COL20 int, COL21 int, COL22 int, COL23 int, COL24 int, COL25 int, COL26 int, COL27 int, COL28 int, COL29 int, COL30 int, COL31 int, COL32 int, COL33 int, COL34 int, COL35 int, COL36 int, COL37 int, COL38 int, COL39 int, COL40 int, COL41 int, COL42 int, COL43 int, COL44 int, COL45 int, COL46 int, COL47 int, COL48 int, COL49 int, COL50 int, COL51 int, COL52 int, COL53 int, COL54 int, COL55 int, COL56 int, COL57 int, COL58 int, COL59 int, COL60 int, COL61 int, COL62 int, COL63 int, COL64 int, COL65 int, COL66 int, COL67 int, COL68 int, COL69 int, COL70 int, COL71 int, COL72 int, COL73 int, COL74 int, COL75 int, COL76 int, COL77 int, COL78 int, COL79 int, COL80 int, COL81 int, COL82 int, COL83 int, COL84 int, COL85 int, COL86 int, COL87 int, COL88 int, COL89 int, COL90 int, COL91 int, COL92 int, COL93 int, COL94 int, COL95 int, COL96 int, COL97 int, COL98 int, COL99 int, COL100 int, COL101 int, COL102 int, COL103 int, COL104 int, COL105 int, COL106 int, COL107 int, COL108 int, COL109 int, COL110 int, COL111 int, COL112 int, COL113 int, COL114 int, COL115 int, COL116 int, COL117 int, COL118 int, COL119 int, COL120 int, COL121 int, COL122 int, COL123 int, COL124 int, COL125 int, COL126 int, COL127 int, COL128 int, COL129 int, COL130 int, COL131 int, COL132 int, COL133 int, COL134 int, COL135 int, COL136 int, COL137 int, COL138 int, COL139 int, COL140 int, COL141 int, COL142 int, COL143 int, COL144 int, COL145 int, COL146 int, COL147 int, COL148 int, COL149 int, COL150 int, COL151 int, COL152 int, COL153 int, COL154 int, COL155 int, COL156 int, COL157 int, COL158 int, COL159 int, COL160 int, COL161 int, COL162 int, COL163 int, COL164 int, COL165 int, COL166 int, COL167 int, COL168 int, COL169 int, COL170 int, COL171 int, COL172 int, COL173 int, COL174 int, COL175 int, COL176 int, COL177 int, COL178 int, COL179 int, COL180 int, COL181 int, COL182 int, COL183 int, COL184 int, COL185 int, COL186 int, COL187 int, COL188 int, COL189 int, COL190 int, COL191 int, COL192 int, COL193 int, COL194 int, COL195 int, COL196 int, COL197 int, COL198 int, COL199 int, COL200 int, COL201 int, COL202 int, COL203 int, COL204 int, COL205 int, COL206 int, COL207 int, COL208 int, COL209 int, COL210 int, COL211 int, COL212 int, COL213 int, COL214 int, COL215 int, COL216 int, COL217 int, COL218 int, COL219 int, COL220 int, COL221 int, COL222 int, COL223 int, COL224 int, COL225 int, COL226 int, COL227 int, COL228 int, COL229 int, COL230 int, COL231 int, COL232 int, COL233 int, COL234 int, COL235 int, COL236 int, COL237 int, COL238 int, COL239 int, COL240 int, COL241 int, COL242 int, COL243 int, COL244 int, COL245 int, COL246 int, COL247 int, COL248 int, COL249 int, COL250 int, COL251 int, COL252 int, COL253 int, COL254 int, COL255 int, COL256 int, COL257 int ) EXEC sp_xml_removedocument @idoc; FETCH NEXT FROM CIdInserted INTO @id,@vXML END CLOSE CIdInserted DEALLOCATE CIdInserted END GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TRIGGER [dbo].[UPD_TEST_INT] ON [dbo].[TEST_INT] FOR UPDATE AS BEGIN SET NOCOUNT ON DECLARE @ID INT, @idoc int, @vXML NVARCHAR(MAX) -- RETURN IF USER INSERT DATA -- declare @isrepl sql_variant select @isrepl= sessionproperty('replication_agent') if (@isrepl=0) begin RETURN; end DECLARE CIdInserted CURSOR FOR SELECT ID,CAST(XMLDATA AS NVARCHAR(MAX)) FROM INSERTED; OPEN CIdInserted FETCH NEXT FROM CIdInserted INTO @id,@vXML WHILE @@FETCH_STATUS = 0 BEGIN EXEC sp_xml_preparedocument @idoc OUTPUT, @vXML IF NOT EXISTS (SELECT 1 FROM TEST WHERE ID =@ID) BEGIN INSERT INTO TEST(ID,COL1,COL2,COL3,COL4,COL5,COL6,COL7,COL8,COL9,COL10,COL11,COL12,COL13,COL14,COL15,COL16,COL17,COL18,COL19,COL20,COL21,COL22,COL23,COL24,COL25,COL26,COL27,COL28,COL29,COL30,COL31,COL32,COL33,COL34,COL35,COL36,COL37,COL38,COL39,COL40,COL41,COL42,COL43,COL44,COL45,COL46,COL47,COL48,COL49,COL50,COL51,COL52,COL53,COL54,COL55,COL56,COL57,COL58,COL59,COL60,COL61,COL62,COL63,COL64,COL65,COL66,COL67,COL68,COL69,COL70,COL71,COL72,COL73,COL74,COL75,COL76,COL77,COL78,COL79,COL80,COL81,COL82,COL83,COL84,COL85,COL86,COL87,COL88,COL89,COL90,COL91,COL92,COL93,COL94,COL95,COL96,COL97,COL98,COL99,COL100,COL101,COL102,COL103,COL104,COL105,COL106,COL107,COL108,COL109,COL110,COL111,COL112,COL113,COL114,COL115,COL116,COL117,COL118,COL119,COL120,COL121,COL122,COL123,COL124,COL125,COL126,COL127,COL128,COL129,COL130,COL131,COL132,COL133,COL134,COL135,COL136,COL137,COL138,COL139,COL140,COL141,COL142,COL143,COL144,COL145,COL146,COL147,COL148,COL149,COL150,COL151,COL152,COL153,COL154,COL155,COL156,COL157,COL158,COL159,COL160,COL161,COL162,COL163,COL164,COL165,COL166,COL167,COL168,COL169,COL170,COL171,COL172,COL173,COL174,COL175,COL176,COL177,COL178,COL179,COL180,COL181,COL182,COL183,COL184,COL185,COL186,COL187,COL188,COL189,COL190,COL191,COL192,COL193,COL194,COL195,COL196,COL197,COL198,COL199,COL200,COL201,COL202,COL203,COL204,COL205,COL206,COL207,COL208,COL209,COL210,COL211,COL212,COL213,COL214,COL215,COL216,COL217,COL218,COL219,COL220,COL221,COL222,COL223,COL224,COL225,COL226,COL227,COL228,COL229,COL230,COL231,COL232,COL233,COL234,COL235,COL236,COL237,COL238,COL239,COL240,COL241,COL242,COL243,COL244,COL245,COL246,COL247,COL248,COL249,COL250,COL251,COL252,COL253,COL254,COL255,COL256,COL257) SELECT ID,COL1,COL2,COL3,COL4,COL5,COL6,COL7,COL8,COL9,COL10,COL11,COL12,COL13,COL14,COL15,COL16,COL17,COL18,COL19,COL20,COL21,COL22,COL23,COL24,COL25,COL26,COL27,COL28,COL29,COL30,COL31,COL32,COL33,COL34,COL35,COL36,COL37,COL38,COL39,COL40,COL41,COL42,COL43,COL44,COL45,COL46,COL47,COL48,COL49,COL50,COL51,COL52,COL53,COL54,COL55,COL56,COL57,COL58,COL59,COL60,COL61,COL62,COL63,COL64,COL65,COL66,COL67,COL68,COL69,COL70,COL71,COL72,COL73,COL74,COL75,COL76,COL77,COL78,COL79,COL80,COL81,COL82,COL83,COL84,COL85,COL86,COL87,COL88,COL89,COL90,COL91,COL92,COL93,COL94,COL95,COL96,COL97,COL98,COL99,COL100,COL101,COL102,COL103,COL104,COL105,COL106,COL107,COL108,COL109,COL110,COL111,COL112,COL113,COL114,COL115,COL116,COL117,COL118,COL119,COL120,COL121,COL122,COL123,COL124,COL125,COL126,COL127,COL128,COL129,COL130,COL131,COL132,COL133,COL134,COL135,COL136,COL137,COL138,COL139,COL140,COL141,COL142,COL143,COL144,COL145,COL146,COL147,COL148,COL149,COL150,COL151,COL152,COL153,COL154,COL155,COL156,COL157,COL158,COL159,COL160,COL161,COL162,COL163,COL164,COL165,COL166,COL167,COL168,COL169,COL170,COL171,COL172,COL173,COL174,COL175,COL176,COL177,COL178,COL179,COL180,COL181,COL182,COL183,COL184,COL185,COL186,COL187,COL188,COL189,COL190,COL191,COL192,COL193,COL194,COL195,COL196,COL197,COL198,COL199,COL200,COL201,COL202,COL203,COL204,COL205,COL206,COL207,COL208,COL209,COL210,COL211,COL212,COL213,COL214,COL215,COL216,COL217,COL218,COL219,COL220,COL221,COL222,COL223,COL224,COL225,COL226,COL227,COL228,COL229,COL230,COL231,COL232,COL233,COL234,COL235,COL236,COL237,COL238,COL239,COL240,COL241,COL242,COL243,COL244,COL245,COL246,COL247,COL248,COL249,COL250,COL251,COL252,COL253,COL254,COL255,COL256,COL257 FROM OPENXML (@idoc, '/Data', 2) WITH (ID int, COL1 int, COL2 int, COL3 int, COL4 int, COL5 int, COL6 int, COL7 int, COL8 int, COL9 int, COL10 int, COL11 int, COL12 int, COL13 int, COL14 int, COL15 int, COL16 int, COL17 int, COL18 int, COL19 int, COL20 int, COL21 int, COL22 int, COL23 int, COL24 int, COL25 int, COL26 int, COL27 int, COL28 int, COL29 int, COL30 int, COL31 int, COL32 int, COL33 int, COL34 int, COL35 int, COL36 int, COL37 int, COL38 int, COL39 int, COL40 int, COL41 int, COL42 int, COL43 int, COL44 int, COL45 int, COL46 int, COL47 int, COL48 int, COL49 int, COL50 int, COL51 int, COL52 int, COL53 int, COL54 int, COL55 int, COL56 int, COL57 int, COL58 int, COL59 int, COL60 int, COL61 int, COL62 int, COL63 int, COL64 int, COL65 int, COL66 int, COL67 int, COL68 int, COL69 int, COL70 int, COL71 int, COL72 int, COL73 int, COL74 int, COL75 int, COL76 int, COL77 int, COL78 int, COL79 int, COL80 int, COL81 int, COL82 int, COL83 int, COL84 int, COL85 int, COL86 int, COL87 int, COL88 int, COL89 int, COL90 int, COL91 int, COL92 int, COL93 int, COL94 int, COL95 int, COL96 int, COL97 int, COL98 int, COL99 int, COL100 int, COL101 int, COL102 int, COL103 int, COL104 int, COL105 int, COL106 int, COL107 int, COL108 int, COL109 int, COL110 int, COL111 int, COL112 int, COL113 int, COL114 int, COL115 int, COL116 int, COL117 int, COL118 int, COL119 int, COL120 int, COL121 int, COL122 int, COL123 int, COL124 int, COL125 int, COL126 int, COL127 int, COL128 int, COL129 int, COL130 int, COL131 int, COL132 int, COL133 int, COL134 int, COL135 int, COL136 int, COL137 int, COL138 int, COL139 int, COL140 int, COL141 int, COL142 int, COL143 int, COL144 int, COL145 int, COL146 int, COL147 int, COL148 int, COL149 int, COL150 int, COL151 int, COL152 int, COL153 int, COL154 int, COL155 int, COL156 int, COL157 int, COL158 int, COL159 int, COL160 int, COL161 int, COL162 int, COL163 int, COL164 int, COL165 int, COL166 int, COL167 int, COL168 int, COL169 int, COL170 int, COL171 int, COL172 int, COL173 int, COL174 int, COL175 int, COL176 int, COL177 int, COL178 int, COL179 int, COL180 int, COL181 int, COL182 int, COL183 int, COL184 int, COL185 int, COL186 int, COL187 int, COL188 int, COL189 int, COL190 int, COL191 int, COL192 int, COL193 int, COL194 int, COL195 int, COL196 int, COL197 int, COL198 int, COL199 int, COL200 int, COL201 int, COL202 int, COL203 int, COL204 int, COL205 int, COL206 int, COL207 int, COL208 int, COL209 int, COL210 int, COL211 int, COL212 int, COL213 int, COL214 int, COL215 int, COL216 int, COL217 int, COL218 int, COL219 int, COL220 int, COL221 int, COL222 int, COL223 int, COL224 int, COL225 int, COL226 int, COL227 int, COL228 int, COL229 int, COL230 int, COL231 int, COL232 int, COL233 int, COL234 int, COL235 int, COL236 int, COL237 int, COL238 int, COL239 int, COL240 int, COL241 int, COL242 int, COL243 int, COL244 int, COL245 int, COL246 int, COL247 int, COL248 int, COL249 int, COL250 int, COL251 int, COL252 int, COL253 int, COL254 int, COL255 int, COL256 int, COL257 int ) END ELSE BEGIN update t set ID = D.ID , COL1 = D.COL1 , COL2 = D.COL2 , COL3 = D.COL3 , COL4 = D.COL4 , COL5 = D.COL5 , COL6 = D.COL6 , COL7 = D.COL7 , COL8 = D.COL8 , COL9 = D.COL9 , COL10 = D.COL10 , COL11 = D.COL11 , COL12 = D.COL12 , COL13 = D.COL13 , COL14 = D.COL14 , COL15 = D.COL15 , COL16 = D.COL16 , COL17 = D.COL17 , COL18 = D.COL18 , COL19 = D.COL19 , COL20 = D.COL20 , COL21 = D.COL21 , COL22 = D.COL22 , COL23 = D.COL23 , COL24 = D.COL24 , COL25 = D.COL25 , COL26 = D.COL26 , COL27 = D.COL27 , COL28 = D.COL28 , COL29 = D.COL29 , COL30 = D.COL30 , COL31 = D.COL31 , COL32 = D.COL32 , COL33 = D.COL33 , COL34 = D.COL34 , COL35 = D.COL35 , COL36 = D.COL36 , COL37 = D.COL37 , COL38 = D.COL38 , COL39 = D.COL39 , COL40 = D.COL40 , COL41 = D.COL41 , COL42 = D.COL42 , COL43 = D.COL43 , COL44 = D.COL44 , COL45 = D.COL45 , COL46 = D.COL46 , COL47 = D.COL47 , COL48 = D.COL48 , COL49 = D.COL49 , COL50 = D.COL50 , COL51 = D.COL51 , COL52 = D.COL52 , COL53 = D.COL53 , COL54 = D.COL54 , COL55 = D.COL55 , COL56 = D.COL56 , COL57 = D.COL57 , COL58 = D.COL58 , COL59 = D.COL59 , COL60 = D.COL60 , COL61 = D.COL61 , COL62 = D.COL62 , COL63 = D.COL63 , COL64 = D.COL64 , COL65 = D.COL65 , COL66 = D.COL66 , COL67 = D.COL67 , COL68 = D.COL68 , COL69 = D.COL69 , COL70 = D.COL70 , COL71 = D.COL71 , COL72 = D.COL72 , COL73 = D.COL73 , COL74 = D.COL74 , COL75 = D.COL75 , COL76 = D.COL76 , COL77 = D.COL77 , COL78 = D.COL78 , COL79 = D.COL79 , COL80 = D.COL80 , COL81 = D.COL81 , COL82 = D.COL82 , COL83 = D.COL83 , COL84 = D.COL84 , COL85 = D.COL85 , COL86 = D.COL86 , COL87 = D.COL87 , COL88 = D.COL88 , COL89 = D.COL89 , COL90 = D.COL90 , COL91 = D.COL91 , COL92 = D.COL92 , COL93 = D.COL93 , COL94 = D.COL94 , COL95 = D.COL95 , COL96 = D.COL96 , COL97 = D.COL97 , COL98 = D.COL98 , COL99 = D.COL99 , COL100 = D.COL100, COL101 = D.COL101, COL102 = D.COL102, COL103 = D.COL103, COL104 = D.COL104, COL105 = D.COL105, COL106 = D.COL106, COL107 = D.COL107, COL108 = D.COL108, COL109 = D.COL109, COL110 = D.COL110, COL111 = D.COL111, COL112 = D.COL112, COL113 = D.COL113, COL114 = D.COL114, COL115 = D.COL115, COL116 = D.COL116, COL117 = D.COL117, COL118 = D.COL118, COL119 = D.COL119, COL120 = D.COL120, COL121 = D.COL121, COL122 = D.COL122, COL123 = D.COL123, COL124 = D.COL124, COL125 = D.COL125, COL126 = D.COL126, COL127 = D.COL127, COL128 = D.COL128, COL129 = D.COL129, COL130 = D.COL130, COL131 = D.COL131, COL132 = D.COL132, COL133 = D.COL133, COL134 = D.COL134, COL135 = D.COL135, COL136 = D.COL136, COL137 = D.COL137, COL138 = D.COL138, COL139 = D.COL139, COL140 = D.COL140, COL141 = D.COL141, COL142 = D.COL142, COL143 = D.COL143, COL144 = D.COL144, COL145 = D.COL145, COL146 = D.COL146, COL147 = D.COL147, COL148 = D.COL148, COL149 = D.COL149, COL150 = D.COL150, COL151 = D.COL151, COL152 = D.COL152, COL153 = D.COL153, COL154 = D.COL154, COL155 = D.COL155, COL156 = D.COL156, COL157 = D.COL157, COL158 = D.COL158, COL159 = D.COL159, COL160 = D.COL160, COL161 = D.COL161, COL162 = D.COL162, COL163 = D.COL163, COL164 = D.COL164, COL165 = D.COL165, COL166 = D.COL166, COL167 = D.COL167, COL168 = D.COL168, COL169 = D.COL169, COL170 = D.COL170, COL171 = D.COL171, COL172 = D.COL172, COL173 = D.COL173, COL174 = D.COL174, COL175 = D.COL175, COL176 = D.COL176, COL177 = D.COL177, COL178 = D.COL178, COL179 = D.COL179, COL180 = D.COL180, COL181 = D.COL181, COL182 = D.COL182, COL183 = D.COL183, COL184 = D.COL184, COL185 = D.COL185, COL186 = D.COL186, COL187 = D.COL187, COL188 = D.COL188, COL189 = D.COL189, COL190 = D.COL190, COL191 = D.COL191, COL192 = D.COL192, COL193 = D.COL193, COL194 = D.COL194, COL195 = D.COL195, COL196 = D.COL196, COL197 = D.COL197, COL198 = D.COL198, COL199 = D.COL199, COL200 = D.COL200, COL201 = D.COL201, COL202 = D.COL202, COL203 = D.COL203, COL204 = D.COL204, COL205 = D.COL205, COL206 = D.COL206, COL207 = D.COL207, COL208 = D.COL208, COL209 = D.COL209, COL210 = D.COL210, COL211 = D.COL211, COL212 = D.COL212, COL213 = D.COL213, COL214 = D.COL214, COL215 = D.COL215, COL216 = D.COL216, COL217 = D.COL217, COL218 = D.COL218, COL219 = D.COL219, COL220 = D.COL220, COL221 = D.COL221, COL222 = D.COL222, COL223 = D.COL223, COL224 = D.COL224, COL225 = D.COL225, COL226 = D.COL226, COL227 = D.COL227, COL228 = D.COL228, COL229 = D.COL229, COL230 = D.COL230, COL231 = D.COL231, COL232 = D.COL232, COL233 = D.COL233, COL234 = D.COL234, COL235 = D.COL235, COL236 = D.COL236, COL237 = D.COL237, COL238 = D.COL238, COL239 = D.COL239, COL240 = D.COL240, COL241 = D.COL241, COL242 = D.COL242, COL243 = D.COL243, COL244 = D.COL244, COL245 = D.COL245, COL246 = D.COL246, COL247 = D.COL247, COL248 = D.COL248, COL249 = D.COL249, COL250 = D.COL250, COL251 = D.COL251, COL252 = D.COL252, COL253 = D.COL253, COL254 = D.COL254, COL255 = D.COL255, COL256 = D.COL256, COL257 = D.COL257 FROM OPENXML (@idoc, '/Data', 2) WITH (ID int, COL1 int, COL2 int, COL3 int, COL4 int, COL5 int, COL6 int, COL7 int, COL8 int, COL9 int, COL10 int, COL11 int, COL12 int, COL13 int, COL14 int, COL15 int, COL16 int, COL17 int, COL18 int, COL19 int, COL20 int, COL21 int, COL22 int, COL23 int, COL24 int, COL25 int, COL26 int, COL27 int, COL28 int, COL29 int, COL30 int, COL31 int, COL32 int, COL33 int, COL34 int, COL35 int, COL36 int, COL37 int, COL38 int, COL39 int, COL40 int, COL41 int, COL42 int, COL43 int, COL44 int, COL45 int, COL46 int, COL47 int, COL48 int, COL49 int, COL50 int, COL51 int, COL52 int, COL53 int, COL54 int, COL55 int, COL56 int, COL57 int, COL58 int, COL59 int, COL60 int, COL61 int, COL62 int, COL63 int, COL64 int, COL65 int, COL66 int, COL67 int, COL68 int, COL69 int, COL70 int, COL71 int, COL72 int, COL73 int, COL74 int, COL75 int, COL76 int, COL77 int, COL78 int, COL79 int, COL80 int, COL81 int, COL82 int, COL83 int, COL84 int, COL85 int, COL86 int, COL87 int, COL88 int, COL89 int, COL90 int, COL91 int, COL92 int, COL93 int, COL94 int, COL95 int, COL96 int, COL97 int, COL98 int, COL99 int, COL100 int, COL101 int, COL102 int, COL103 int, COL104 int, COL105 int, COL106 int, COL107 int, COL108 int, COL109 int, COL110 int, COL111 int, COL112 int, COL113 int, COL114 int, COL115 int, COL116 int, COL117 int, COL118 int, COL119 int, COL120 int, COL121 int, COL122 int, COL123 int, COL124 int, COL125 int, COL126 int, COL127 int, COL128 int, COL129 int, COL130 int, COL131 int, COL132 int, COL133 int, COL134 int, COL135 int, COL136 int, COL137 int, COL138 int, COL139 int, COL140 int, COL141 int, COL142 int, COL143 int, COL144 int, COL145 int, COL146 int, COL147 int, COL148 int, COL149 int, COL150 int, COL151 int, COL152 int, COL153 int, COL154 int, COL155 int, COL156 int, COL157 int, COL158 int, COL159 int, COL160 int, COL161 int, COL162 int, COL163 int, COL164 int, COL165 int, COL166 int, COL167 int, COL168 int, COL169 int, COL170 int, COL171 int, COL172 int, COL173 int, COL174 int, COL175 int, COL176 int, COL177 int, COL178 int, COL179 int, COL180 int, COL181 int, COL182 int, COL183 int, COL184 int, COL185 int, COL186 int, COL187 int, COL188 int, COL189 int, COL190 int, COL191 int, COL192 int, COL193 int, COL194 int, COL195 int, COL196 int, COL197 int, COL198 int, COL199 int, COL200 int, COL201 int, COL202 int, COL203 int, COL204 int, COL205 int, COL206 int, COL207 int, COL208 int, COL209 int, COL210 int, COL211 int, COL212 int, COL213 int, COL214 int, COL215 int, COL216 int, COL217 int, COL218 int, COL219 int, COL220 int, COL221 int, COL222 int, COL223 int, COL224 int, COL225 int, COL226 int, COL227 int, COL228 int, COL229 int, COL230 int, COL231 int, COL232 int, COL233 int, COL234 int, COL235 int, COL236 int, COL237 int, COL238 int, COL239 int, COL240 int, COL241 int, COL242 int, COL243 int, COL244 int, COL245 int, COL246 int, COL247 int, COL248 int, COL249 int, COL250 int, COL251 int, COL252 int, COL253 int, COL254 int, COL255 int, COL256 int, COL257 int ) D inner join TEST T ON D.ID=T.ID WHERE T.ID=@ID END EXEC sp_xml_removedocument @idoc; FETCH NEXT FROM CIdInserted INTO @id,@vXML END CLOSE CIdInserted DEALLOCATE CIdInserted END GO |
We can have one trigger in place to do the same task but to make it simple I am using three different triggers.
Basically, the flow will be like below for INSERT, UPDATE and DELETE.
INSERT:
- User inserts data into main table which fires the trigger to insert the same record in intermediate table
- The insert on intermediate table will be replicated to subscribers using merge agent
- Now at the subscriber, the insert on intermediate table will fire insert trigger to insert data back to main table
UPDATE:
- User updates data on main table which fires the trigger to update the same record in intermediate table
- The update on intermediate table will be replicated to subscribers using merge agent
- Now at the subscriber, the update on intermediate table will fire update trigger to update data back to main table
DELETE:
- User deletes data on main table which fires the trigger to delete the same record in intermediate table
- The delete on intermediate table will be replicated to subscribers using merge agent
- Now at the subscriber, the delete on intermediate table will fire delete trigger to delete data on main table
Refer to the below image to understand the flow.
We need make sure the main table is created manually on subscriber otherwise the triggers on intermediate table “TEST_INT” fails.
Now we need to replicate intermediate table “TEST_INT” instead of main table “TEST”.
Create Merge Replication:
Before creating merge replication, we need to make sure the main table is created on publisher and subscriber with triggers.
The intermediate table is created on Publisher with triggers.
Login to SQL Server from SQL Server management studio. Assuming the distribution is already configured navigate to replication folder-> Local publications -> Right click on new publication. Please refer to the below image.
Click on Next-> select the database where you created main table and intermediate table. Click Next and select merge replication.
Click Next and check 2008 or later -> add TEST_INT and click on article properties ->set properties of all table articles-> make sure copy user triggers is enabled.
Click Next-> Next-> add filter if you want or you can skip and click Next-> check create snapshot immediately and uncheck schedule the snapshot agent to run at following times.
Click Next and add the credentials you want to use for snapshot agent and connecting publisher -> Next -> Next -> and input publication name and finish.
Right click on publication you just created, launch replication monitor and make sure the snapshot is completed.
Once the snapshot is completed we need to add the subscriber to publication.
Navigate to publication you just created, right click and click on new subscription -> Next – Next -> select the type of subscription you want (Pull or push) as per your need -> Next-> add the subscriber server and select the subscriber database. Add the logins to run merge agent, connect the publisher, distributor and the subscriber -> Next -> select agent schedule as per your need. In my case I selected run continuously -> Initialize immediately -> select subscription type as per your need -> check create subscriber and click Next -> Finish.
Once the initial snapshot is applied the intermediate table and the triggers on it are created on subscriber.
Data Loading:
After adding the intermediate table to replication, we need to perform below steps if the main table “TEST” has data already.
We ignore below steps if the main table “TEST” is blank and we are inserting data after adding intermediate table “TEST_INT” to replication and snapshot is applied to subscriber.
Now as part of initial data load into intermediate table “TEST_INT” we can update any one column with same value. So that update trigger on main table is fired and data is inserted into intermediate table or you can use any other way to load initial data into intermediate table.
|
1 |
UPDATE TEST SET COL1=COL1 |
Now these updates populate data into intermediate table and are replicated to subscribers. At subscribers the data is inserted back to main table.
Now we have the same data on main table and intermediate at publisher and subscribers.
Now any incremental inserts, updates and deletes on main table will get replicated to subscribers via intermediate table.
Notes:
- Any changes in table structure like dropping column or adding new column to main table “TEST” needs trigger modification.
- Schema changes to main table “TEST” should be done on both publisher and subscribers manually
- Trigger change on main table “TEST” should be done on both publisher and subscribers manually
- Make sure the triggers on main table should fire only on user operation not the replication agent
- Make sure the triggers on intermediate table should fire only on replication agent operations not the user
In this article we have discussed below points.
- How to replicate a table with more than 246 columns using intermediate table
- Triggers which should fire on user operation
- Triggers which should fire on replication agent operation
- Use of sessionproperty(‘replication_agent’)
Next Steps
- Use this solution if you need to replicate a table with more than 246 columns
- Add more error handling cases to these triggers or the solution to make it strong
- Validate your data regularly or create an alert to check counts of main and intermediate tables
- You can optimize the trigger code and use your own logic to insert/update/delete
Table of contents
SQL Server DBA, Developer with good experience in SQL Server administration, development, performance tuning, monitoring, high availability and disaster recovery technologies
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