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Uncommitted dependency (dirty read) One transaction is modifying data Before the transaction is done, a second transaction reads the modified data This is considered a dirty read because the original transaction could roll back the data, but the second transaction still treats the data as valid Inconsistent analysis (non-repeatable read) This is similar to a dirty read except there are multiple reads of a row, and the data is changing each time the row is read A second transaction accesses the same row several times and reads different data each time due to modifications from other transactions Phantom reads A phantom read occurs when a delete is performed by one transaction against a range of rows being read by another transaction The first read shows it exists, but due to a deletion, subsequent reads show it is no longer there a phantom Or, the first read shows the row does not exist, but subsequent reads show the row is there Lost Updates Last one who saves, wins If two transactions are allowed to modify the same row at the same time (though on different columns), then the second transaction will overwrite the first one

With a better understanding of the concurrency side effects, we can now explore the transaction isolation levels a little better These are not restricted to Microsoft s SQL Server, but instead are part of the SQL-99 standard

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Figure 1 8. Adding a new member to an object Yipes, 1440 calories! On second thoughts, I d like to remove that from iceCream. To do so, pass the "Peanut Butter Cup" member to the delete operator, which as its name implies deletes a member from an object. Consequently, when we query iceCream["Peanut Butter Cup"] following its demolition, JavaScript returns undefined to convey no value. We can t glue undefined to a string, though. So, JavaScript converts it to "undefined" first. var iceCream = { "Chocolate Fudge Brownie": 4 * 260, "Half Baked": 4 * 270, "New York Super Fudge Chunk": 4 * 300, "Coffee Heath Bar Crunch": 4 * 280, "Cherry Garcia": 4 * 240, "Mud Pie": 4 * 270, "Milk & Cookies": 4 * 270, "Cinnamon Buns": 4 * 290, "Chocolate Chip Cookie Dough": 4 * 270, "Mission to Marzipan": 4 * 260 }; iceCream["Peanut Butter Cup"] = 4 * 360; delete iceCream["Peanut Butter Cup"]; iceCream["Peanut Butter Cup"] + " calories per pint"; // "undefined calories per pint"

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Read Committed (Default)

Naming iceCream members with strings enabled us to use whitespace, which is forbidden for identifiers. But we could have gone with camel case identifiers like so: var iceCream = { chocolateFudgeBrownie: 4 * 260, halfBaked: 4 * 270, newYorkSuperFudgeChunk: 4 * 300, coffeeHeathBarCrunch: 4 * 280, cherryGarcia: 4 * 240, mudPie: 4 * 270, milkCookies: 4 * 270, cinnamonBuns: 4 * 290, chocolateChipCookieDough: 4 * 270, missionToMarzipan: 4 * 260 }; Having done so, we can now query members with the . operator followed by an identifier. Try doing so in Firebug by entering and running the following sample, verifying your work with Figure 1 9. var iceCream = { chocolateFudgeBrownie: 4 * 260, halfBaked: 4 * 270, newYorkSuperFudgeChunk: 4 * 300, coffeeHeathBarCrunch: 4 * 280, cherryGarcia: 4 * 240, mudPie: 4 * 270, milkCookies: 4 * 270, cinnamonBuns: 4 * 290, chocolateChipCookieDough: 4 * 270, missionToMarzipan: 4 * 260 }; iceCream.newYorkSuperFudgeChunk + " calories per pint"; // "1200 calories per pint"

This is the default if a transaction isolation level is not specified in SQL Server 2005 Read Committed specifies that statements cannot read data that has been modified but not committed Nonrepeatable reads or phantom reads are possible with the Read Committed transaction isolation level since data can be changed by other transactions between individual statements within the current transaction A new feature in SQL Server 2005 is the READ_COMMITTED_SNAPSHOT option This option slightly modifies the behavior of the Read Committed transaction isolation level

To update the value of a member or to add a new member, you would use the = operator, same as before. Let s add a bostonCreamPie member to iceCream. Then query its value, verifying our work with Figure 1 10: var iceCream = { chocolateFudgeBrownie: 4 * 260, halfBaked: 4 * 270, newYorkSuperFudgeChunk: 4 * 300, coffeeHeathBarCrunch: 4 * 280, cherryGarcia: 4 * 240, mudPie: 4 * 270, milkCookies: 4 * 270, cinnamonBuns: 4 * 290, chocolateChipCookieDough: 4 * 270, missionToMarzipan: 4 * 260 }; iceCream.bostonCreamPie = 4 * 250; iceCream.bostonCreamPie + " calories per pint"; // "1000 calories per pint"

If READ_COMMITTED_SNAPSHOT is set to OFF, shared locks prevent other transactions from modifying rows while the current transaction is running a read operation This is the default in SQL Server

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If the READ_COMMITTED_SNAPSHOT option is ON, then row versioning is used to provide a transactionally consistent snapshot of data as it existed when first queried While the read still views the original unchanged data, locks are not used to protect the data from updates

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