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Handling Governor Limits through Trigger

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by June 1, 2012 Triggers
1. Bulkify your code:
Bad Code
trigger accTrggr on Account (before insert, before update) {
//This only handles the first record in the Trigger.new collection
//But if more than one Account initiated this trigger, those additional records
//will not be processed
Account acct

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= Trigger.new[0];

acct.Description = acct.Name “:” acct.BillingState;
}
Correct Code
trigger accTrggr on Account (before insert, before update) {
List accountNames = new List{};
//Loop through all records in the Trigger.new collection
for(Account a: Trigger.new) {
//Concatenate the Name and billingState into the Description field a.Description = a.Name “:” a.BillingState;
}}
2. Avoid SOQL Queries inside FOR Loops
Move SOQL queries outside FOR loop
Bad Code
trigger accountTestTrggr on Account (before insert, before update) {
for(Account a: Trigger.new) {
List contacts = [select id, salutation, firstname, lastname, email from Contact where accountId = :a.Id];
for(Contact c: contacts){
c.Description=c.salutation ” ” c.firstName ” ” c.lastname;
update c;
} } }
Good Code
trigger accountTestTrggr on Account (before insert, before update) {
List accountsWithContacts = [select id, name, (select id, salutation, description, firstname, lastname, email from Contacts) from Account where Id IN :Trigger.newMap.keySet()];
List contactsToUpdate = new List{};
for(Account a: accountsWithContacts){
for(Contact c: a.Contacts){
c.Description=c.salutation ” ” c.firstName ” ” c.lastname; contactsToUpdate.add(c);
} }
update contactsToUpdate;
}
3. Bulkify your Helper Methods
4. Using Collections, Streamlining Queries, and Efficient For Loops
Bad Code
trigger accountTrigger on Account (before delete, before insert, before update) {
//This code inefficiently queries the Opportunity object in two seperate queries
List opptysClosedLost = [select id, name, closedate, stagename from Opportunity where accountId IN :Trigger.newMap.keySet() and StageName=”Closed – Lost”];
List opptysClosedWon = [select id, name, closedate, stagename from Opportunity where accountId IN :Trigger.newMap.keySet() and StageName=”Closed – Won”];
for(Account a : Trigger.new){
//This code inefficiently has two inner FOR loops
//Redundantly processes the List of Opportunity Lost
for(Opportunity o: opptysClosedLost){
if(o.accountid == a.id)
System.debug(“Do more logic here…”); }
//Redundantly processes the List of Opportunity Won
for(Opportunity o: opptysClosedWon){
if(o.accountid == a.id) System.debug(“Do more logic here…”); } } }
Good Code
trigger accountTrigger on online casino Account (before delete, before insert, before update) {
/*This code queries all related Closed Lost & Closed Won oppor in a single query. */
List accountWithOpptys = [select id, name, (select id, name, closedate, stagename from Opportunities where accountId IN :Trigger.newMap.keySet() and (StageName=”Closed – Lost” or StageName = “Closed – Won”)) from Account where Id IN :Trigger.newMap.keySet()];
//Loop through Accounts only once
for(Account a : accountWithOpptys){
//Loop through related Opportunities only once
for(Opportunity o: a.Opportunities){
if(o.StageName == “Closed – Won”){
System.debug(“Opportunity Closed Won…do some more logic here…”);
}else if(o.StageName ==”Closed – Lost”){
System.debug(“Opportunity Closed Lost…do some more logic here…”);
} } } }
5. Streamlining Multiple Triggers on the Same Object
  • Many Triggers for a single Object
  • Order of execution cant be defined
  • All Triggers executing in a single transaction will SHARE the governor limits.
  • Add appropriate conditions for trigger executions
  • Handling of Governor Limits across all the triggers
  • If possible, join the triggers
6. Querying Large Data Sets
Bad Code
//A runtime exception is thrown if this query returns 1001 or more records.
Account [] accts = [SELECT id FROM account];
Good Code
// Use this format for efficiency if you are executing DML statements
// within the for loop
for (List accts : [SELECT id, name FROM account WHERE name LIKE “Acme”]) {
// Your code here
update accts;
}
7. Other Best Practices
  • Use of the Limits Apex Methods to Avoid Hitting Governor Limits
  • Limits.getLimitQueries()
  • Limits.getLimitDmlRows()
  • Enable Apex Governor Limit Warning Emails
  • Write Test Methods to Verify Large Datasets
  • Avoid Hardcoding IDs
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