What kind of operations is doing when DML statement is executing

i want to know what kind of operations are doing where dml sql statement is executeing - undo and redo log, index renewing, transaction log, audit log - is there some operations that i do not know ?

Intially sql goes to library cache, where it checks for syntax and sematics, once it pass throw, it generates a 16 digit hash code for that sql( for the first time this can be treated as 'HARD PARSING' and and the same sql given for 2nd time it wont do the entire process, just uses the existing #code, this is called as 'SOFT PARSING") and finally this goes to DDC where object existence and privileges are checked, once it passed all these it gets the file#,block# to fetech the blocks form datafile, and those will be fetched to database buffer cache and then to client system in such a format that we can usderstood.
Hope this makes sense to you!
tx- Harry

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