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I am using Java SDK of app-engine.
I am using Master-slave datastore.
I have only two tables, each having 30 columns and none of them has size greater than 20 bytes.
After entering 300 rows in each table, it shows Datastore write operations 0.03 Millions out of 0.05 Millions.
I have checked the tables. They contain 300 entries only. There is no infinite loop kind of bug in my code.
Would someone please help me to point me out where I might be going wrong?
Thanks,
Amrish.
As noted in the previous answer, those write totals include your index writes.
All entity properties have associated default indexes (unless the property is configured to be unindexed), even if you have not defined any custom indexes.
See http://code.google.com/appengine/articles/indexselection.html for more detail, and http://code.google.com/appengine/docs/billing.html#Billable_Resource_Unit_Cost for more specifics on write costs.
For example, a new entity ‘put’ is:
2 Writes + 2 Writes per indexed property value (these are for the default indexes for that property) + 1 Write per composite index value (for any relevant custom indexes that you have defined).