Row cache lock aquired for more than 1 hour

Hi could some please let me know what is ROW CACHE LOCK, and at what situations does this happen. And also what does dc_histogram_defs enqueue means, what happening internally??
I am facing with a problem in our d/b(11g r1) with a code running more that 1 hr, but nothing is happening in our objects actually, only info i can see is ROW CACHE LOCK for more that 3000 seconds:
select p1text,p1,p2text,p2,p3text,p3 from v$session where event = 'row cache lock' and sid=37
P1TEXT     P1     P2TEXT     P2     P3TEXT     P3
cache id     16     mode     0     request     3
select type,parameter,count,usage,gets,getmisses,scans,scanmisses,flushes,dlm_requests from v$rowcache where cache#=16
TYPE     PARAMETER     COUNT     USAGE     GETS     GETMISSES     SCANS     SCANMISSES     FLUSHES     DLM_REQUESTS
PARENT     dc_histogram_defs     4,497     4,497     12,426,122     1,446,845     0     0     210,040     1,706,801
SUBORDINATE     dc_histogram_data     1,965     1,965     8,995,128     500,660     0     0     91,463     0
SUBORDINATE     dc_histogram_data     297     297     3,500,090     46,371     0     0     6,591     0

hi,
could you take a look at this topic
row cache lock
regards,

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                                                                                                                       25 INDEX RANGE SCAN INDEX PO.PO_APPROVED_SUPPLIER_LIST_N1 Cost: 1 Cardinality: 1                                                   
                                                                                                             29 TABLE ACCESS BY INDEX ROWID TABLE PO.PO_VENDORS Cost: 1 Bytes: 34 Cardinality: 1                                                             
                                                                                                                  28 INDEX UNIQUE SCAN INDEX (UNIQUE) PO.PO_VENDORS_U1 Cost: 0 Cardinality: 1                                                        
                                                                                                        32 TABLE ACCESS BY INDEX ROWID TABLE BOM.CST_ITEM_COSTS Cost: 3 Bytes: 19 Cardinality: 1                                                                  
                                                                                                             31 INDEX RANGE SCAN INDEX (UNIQUE) BOM.CST_ITEM_COSTS_U1 Cost: 2 Cardinality: 1                                                             
                                                                                                   35 TABLE ACCESS BY INDEX ROWID TABLE BOM.CST_COST_TYPES Cost: 1 Bytes: 17 Cardinality: 1                                                                       
                                                                                                        34 INDEX UNIQUE SCAN INDEX (UNIQUE) BOM.CST_COST_TYPES_U1 Cost: 0 Cardinality: 1                                                                  
                                                                                              37 INDEX UNIQUE SCAN INDEX (UNIQUE) BOM.CST_COST_TYPES_U1 Cost: 0 Bytes: 4 Cardinality: 1                                                                            
                                                                                         40 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_SYSTEM_ITEMS_B Cost: 2 Bytes: 15 Cardinality: 1                                                                                 
                                                                                              39 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_B_U1 Cost: 1 Cardinality: 1                                                                            
                                                                                    42 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_TL_U1 Cost: 1 Bytes: 13 Cardinality: 1                                                                                      
                                                                               44 INDEX RANGE SCAN INDEX (UNIQUE) INV.MTL_ITEM_CATEGORIES_U1 Cost: 2 Bytes: 17 Cardinality: 1                                                                                           
                                                                     47 INDEX RANGE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_B_U1 Cost: 2 Bytes: 30 Cardinality: 3                                                                                                     
                                                                49 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_PARAMETERS_U1 Cost: 0 Bytes: 4 Cardinality: 1                                                                                                          
                                                           52 TABLE ACCESS BY INDEX ROWID TABLE HR.HR_ALL_ORGANIZATION_UNITS Cost: 1 Bytes: 6 Cardinality: 1                                                                                                               
                                                                51 INDEX UNIQUE SCAN INDEX (UNIQUE) HR.HR_ORGANIZATION_UNITS_PK Cost: 0 Cardinality: 1                                                                                                          
                                                      54 INDEX UNIQUE SCAN INDEX (UNIQUE) HR.HR_ALL_ORGANIZATION_UNTS_TL_PK Cost: 0 Bytes: 7 Cardinality: 1                                                                                                                    
                                                 56 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_PARAMETERS_U1 Cost: 0 Bytes: 4 Cardinality: 1                                                                                                                         
                                            59 TABLE ACCESS BY INDEX ROWID TABLE HR.HR_ORGANIZATION_INFORMATION Cost: 2 Bytes: 25 Cardinality: 1                                                                                                                              
                                                 58 INDEX RANGE SCAN INDEX HR.HR_ORGANIZATION_INFORMATIO_FK2 Cost: 1 Cardinality: 1                                                                                                                         
                                       62 TABLE ACCESS BY INDEX ROWID TABLE HR.HR_ORGANIZATION_INFORMATION Cost: 1 Bytes: 26 Cardinality: 1                                                                                                                                   
                                            61 INDEX RANGE SCAN INDEX HR.HR_ORGANIZATION_INFORMATIO_FK2 Cost: 1 Cardinality: 1                                                                                                                              
                                  64 INDEX FULL SCAN INDEX (UNIQUE) GL.GL_SETS_OF_BOOKS_U2 Cost: 1 Bytes: 4 Cardinality: 1                                                                                                                                        
                             66 INDEX RANGE SCAN INDEX (UNIQUE) APPLSYS.FND_LOOKUP_VALUES_U1 Cost: 2 Bytes: 36 Cardinality: 1                                                                                                                                             
                        68 TABLE ACCESS FULL TABLE APPLSYS.FND_PRODUCT_GROUPS Cost: 5 Bytes: 2 Cardinality: 1                                                                                                                                                  
                   138 NESTED LOOPS Cost: 278 Bytes: 459 Cardinality: 1                                                                                                                                                       
                        136 NESTED LOOPS Cost: 277 Bytes: 449 Cardinality: 1                                                                                                                                                  
                             134 NESTED LOOPS Cost: 277 Bytes: 445 Cardinality: 1                                                                                                                                             
                                  132 NESTED LOOPS Cost: 277 Bytes: 441 Cardinality: 1                                                                                                                                        
                                       129 NESTED LOOPS Cost: 275 Bytes: 415 Cardinality: 1                                                                                                                                   
                                            127 NESTED LOOPS Cost: 275 Bytes: 408 Cardinality: 1                                                                                                                              
                                                 124 NESTED LOOPS Cost: 274 Bytes: 402 Cardinality: 1                                                                                                                         
                                                      122 NESTED LOOPS Cost: 273 Bytes: 398 Cardinality: 1                                                                                                                    
                                                           120 MERGE JOIN CARTESIAN Cost: 268 Bytes: 373 Cardinality: 1                                                                                                               
                                                                117 FILTER                                                                                                          
                                                                     116 NESTED LOOPS OUTER Cost: 263 Bytes: 371 Cardinality: 1                                                                                                     
                                                                          114 NESTED LOOPS Cost: 261 Bytes: 354 Cardinality: 1                                                                                                
                                                                               112 NESTED LOOPS OUTER Cost: 260 Bytes: 341 Cardinality: 1                                                                                           
                                                                                    110 NESTED LOOPS Cost: 258 Bytes: 305 Cardinality: 1                                                                                      
                                                                                         107 NESTED LOOPS Cost: 256 Bytes: 290 Cardinality: 1                                                                                 
                                                                                              105 NESTED LOOPS Cost: 256 Bytes: 286 Cardinality: 1                                                                            
                                                                                                   102 NESTED LOOPS Cost: 255 Bytes: 269 Cardinality: 1                                                                       
                                                                                                        99 NESTED LOOPS Cost: 252 Bytes: 250 Cardinality: 1                                                                  
                                                                                                             97 NESTED LOOPS Cost: 251 Bytes: 237 Cardinality: 1                                                             
                                                                                                                  95 NESTED LOOPS Cost: 250 Bytes: 215 Cardinality: 1                                                        
                                                                                                                       93 NESTED LOOPS Cost: 249 Bytes: 193 Cardinality: 1                                                   
                                                                                                                            90 NESTED LOOPS Cost: 245 Bytes: 294 Cardinality: 2                                              
                                                                                                                                 87 HASH JOIN Cost: 230 Bytes: 387 Cardinality: 3                                         
                                                                                                                                      85 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_CATEGORIES_B Cost: 41 Bytes: 92 Cardinality: 4                                    
                                                                                                                                           84 NESTED LOOPS Cost: 90 Bytes: 95 Cardinality: 1                               
                                                                                                                                                82 NESTED LOOPS Cost: 49 Bytes: 72 Cardinality: 1                          
                                                                                                                                                     79 NESTED LOOPS Cost: 8 Bytes: 41 Cardinality: 1                     
                                                                                                                                                          77 NESTED LOOPS Cost: 3 Bytes: 30 Cardinality: 1                
                                                                                                                                                               74 NESTED LOOPS Cost: 2 Bytes: 22 Cardinality: 1           
                                                                                                                                                                    71 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_CATEGORY_SETS_B Cost: 1 Bytes: 11 Cardinality: 1      
                                                                                                                                                                         70 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_CATEGORY_SETS_B_U1 Cost: 0 Cardinality: 1
                                                                                                                                                                    73 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_CATEGORY_SETS_B Cost: 1 Bytes: 11 Cardinality: 1      
                                                                                                                                                                         72 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_CATEGORY_SETS_B_U1 Cost: 0 Cardinality: 1
                                                                                                                                                               76 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_DEFAULT_CATEGORY_SETS Cost: 1 Bytes: 8 Cardinality: 1           
                                                                                                                                                                    75 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_DEFAULT_CATEGORY_SETS_U1 Cost: 0 Cardinality: 1      
                                                                                                                                                          78 TABLE ACCESS FULL TABLE PO.PO_ASL_STATUSES Cost: 5 Bytes: 11 Cardinality: 1                
                                                                                                                                                     81 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_CATEGORIES_B Cost: 41 Bytes: 93 Cardinality: 3                     
                                                                                                                                                          80 INDEX RANGE SCAN INDEX INV.MTL__CATEGORIES_B_N2 Cost: 3 Cardinality: 1,426                
                                                                                                                                                83 INDEX RANGE SCAN INDEX INV.MTL__CATEGORIES_B_N2 Cost: 3 Cardinality: 1,426                          
                                                                                                                                      86 TABLE ACCESS FULL TABLE PO.PO_VENDORS Cost: 139 Bytes: 15,980 Cardinality: 470                                    
                                                                                                                                 89 TABLE ACCESS BY INDEX ROWID TABLE PO.PO_APPROVED_SUPPLIER_LIST Cost: 13 Bytes: 18 Cardinality: 1                                         
                                                                                                                                      88 INDEX RANGE SCAN INDEX PO.PO_APPROVED_SUPPLIER_LIST_N3 Cost: 1 Cardinality: 64                                    
                                                                                                                            92 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_SYSTEM_ITEMS_B Cost: 2 Bytes: 46 Cardinality: 1                                              
                                                                                                                                 91 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_B_U1 Cost: 1 Cardinality: 1                                         
                                                                                                                       94 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_ITEM_CATEGORIES_U1 Cost: 1 Bytes: 22 Cardinality: 1                                                   
                                                                                                                  96 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_ITEM_CATEGORIES_U1 Cost: 1 Bytes: 22 Cardinality: 1                                                        
                                                                                                             98 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_TL_U1 Cost: 1 Bytes: 13 Cardinality: 1                                                             
                                                                                                        101 TABLE ACCESS BY INDEX ROWID TABLE BOM.CST_ITEM_COSTS Cost: 3 Bytes: 19 Cardinality: 1                                                                  
                                                                                                             100 INDEX RANGE SCAN INDEX (UNIQUE) BOM.CST_ITEM_COSTS_U1 Cost: 2 Cardinality: 1                                                             
                                                                                                   104 TABLE ACCESS BY INDEX ROWID TABLE BOM.CST_COST_TYPES Cost: 1 Bytes: 17 Cardinality: 1                                                                       
                                                                                                        103 INDEX UNIQUE SCAN INDEX (UNIQUE) BOM.CST_COST_TYPES_U1 Cost: 0 Cardinality: 1                                                                  
                                                                                              106 INDEX UNIQUE SCAN INDEX (UNIQUE) BOM.CST_COST_TYPES_U1 Cost: 0 Bytes: 4 Cardinality: 1                                                                            
                                                                                         109 TABLE ACCESS BY INDEX ROWID TABLE INV.MTL_SYSTEM_ITEMS_B Cost: 2 Bytes: 15 Cardinality: 1                                                                                 
                                                                                              108 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_B_U1 Cost: 1 Cardinality: 1                                                                            
                                                                                    111 INDEX RANGE SCAN INDEX (UNIQUE) APPLSYS.FND_LOOKUP_VALUES_U1 Cost: 2 Bytes: 36 Cardinality: 1                                                                                      
                                                                               113 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_TL_U1 Cost: 1 Bytes: 13 Cardinality: 1                                                                                           
                                                                          115 INDEX RANGE SCAN INDEX (UNIQUE) INV.MTL_ITEM_CATEGORIES_U1 Cost: 2 Bytes: 17 Cardinality: 1                                                                                                
                                                                119 BUFFER SORT Cost: 266 Bytes: 2 Cardinality: 1                                                                                                          
                                                                     118 TABLE ACCESS FULL TABLE APPLSYS.FND_PRODUCT_GROUPS Cost: 5 Bytes: 2 Cardinality: 1                                                                                                     
                                                           121 TABLE ACCESS FULL TABLE HR.HR_ORGANIZATION_INFORMATION Cost: 5 Bytes: 25 Cardinality: 1                                                                                                               
                                                      123 INDEX FULL SCAN INDEX (UNIQUE) GL.GL_SETS_OF_BOOKS_U2 Cost: 1 Bytes: 4 Cardinality: 1                                                                                                                    
                                                 126 TABLE ACCESS BY INDEX ROWID TABLE HR.HR_ALL_ORGANIZATION_UNITS Cost: 1 Bytes: 6 Cardinality: 1                                                                                                                         
                                                      125 INDEX UNIQUE SCAN INDEX (UNIQUE) HR.HR_ORGANIZATION_UNITS_PK Cost: 0 Cardinality: 1                                                                                                                    
                                            128 INDEX UNIQUE SCAN INDEX (UNIQUE) HR.HR_ALL_ORGANIZATION_UNTS_TL_PK Cost: 0 Bytes: 7 Cardinality: 1                                                                                                                              
                                       131 TABLE ACCESS BY INDEX ROWID TABLE HR.HR_ORGANIZATION_INFORMATION Cost: 2 Bytes: 26 Cardinality: 1                                                                                                                                   
                                            130 INDEX RANGE SCAN INDEX HR.HR_ORGANIZATION_INFORMATIO_FK2 Cost: 1 Cardinality: 1                                                                                                                              
                                  133 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_PARAMETERS_U1 Cost: 0 Bytes: 4 Cardinality: 1                                                                                                                                        
                             135 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_PARAMETERS_U1 Cost: 0 Bytes: 4 Cardinality: 1                                                                                                                                             
                        137 INDEX UNIQUE SCAN INDEX (UNIQUE) INV.MTL_SYSTEM_ITEMS_B_U1 Cost: 1 Bytes: 10 Cardinality: 1                                                                                                                                                  
    Regards,
    Siva.

    Welcome to the forums !
    Pl post details of OS, database and EBS versions.
    Pl see these threads on how to post a tuning request -
    HOW TO: Post a SQL statement tuning request - template posting
    When your query takes too long ...
    HTH
    Srini

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