Anyone knows the meaning of the LOP_SET_FREE_SPACE etc?

Hi All,

I am trying to figure out what operations caused the log grown so large, I used below query:

SELECT Operation, Context, count(*) FROM 
       fn_dblog (NULL,NULL)
       group by Operation, Context
       order by count(*)  desc

but I am not too sure what the result means:

OperationContextCounts
LOP_SET_FREE_SPACELCX_PFS737061
LOP_SET_BITSLCX_PFS625844
LOP_INSERT_ROWSLCX_TEXT_MIX362692
LOP_DELETE_ROWSLCX_TEXT_MIX326513
LOP_REMOVE_VERSION_INFOLCX_REMOVE_VERSION_INFO312940
LOP_MODIFY_ROWLCX_TEXT_TREE220074
LOP_MODIFY_ROWLCX_TEXT_MIX86597
LOP_MODIFY_ROWLCX_PFS48589
LOP_SET_BITSLCX_DIFF_MAP44691
LOP_FORMAT_PAGELCX_TEXT_MIX43316
LOP_HOBT_DELTALCX_NULL43166
LOP_SET_BITSLCX_IAM5425
LOP_SET_BITSLCX_GAM5425
LOP_COUNT_DELTALCX_CLUSTERED3065
LOP_MODIFY_ROWLCX_CLUSTERED931
LOP_INSERT_ROWSLCX_TEXT_TREE724
LOP_BEGIN_XACTLCX_NULL723
LOP_COMMIT_XACTLCX_NULL722
LOP_DELETE_ROWSLCX_TEXT_TREE636
LOP_FILE_HDR_MODIFYLCX_FILE_HEADER590
LOP_LOCK_XACTLCX_NULL254
LOP_MODIFY_HEADERLCX_PFS221
LOP_MODIFY_COLUMNSLCX_CLUSTERED105
LOP_FORMAT_PAGELCX_TEXT_TREE88
LOP_INSERT_ROWSLCX_INDEX_LEAF44
LOP_XACT_CKPTLCX_BOOT_PAGE_CKPT34
LOP_BEGIN_CKPTLCX_NULL34
LOP_END_CKPTLCX_NULL34
LOP_DELETE_ROWSLCX_MARK_AS_GHOST33
LOP_XACT_CKPTLCX_NULL28
LOP_INSERT_ROWSLCX_CLUSTERED19
LOP_MODIFY_ROWLCX_BOOT_PAGE4
LOP_INSERT_ROWSLCX_HEAP3
LOP_INVALIDATE_CACHELCX_NULL3
LOP_PREP_XACTLCX_NULL2
LOP_EXPUNGE_ROWSLCX_CLUSTERED2
LOP_ABORT_XACTLCX_NULL1
LOP_EXPUNGE_ROWSLCX_INDEX_LEAF1
LOP_SHRINK_NOOPLCX_DIAGNOSTICS1