我们只是想弄明白是怎么回事为什么会这样。我们有一个全天刷新实体化视图的作业。每次MV刷新时，也会生成跟踪文件。
下面是一个示例跟踪文件。这个文件中有什么有用的信息？为什么MV刷新会不断产生这些问题？

Trace file /opt/app/oracle/diag/rdbms/ni00/NI00/trace/NI00_ora_1172699.trc
Oracle Database 12c Standard Edition Release 12.2.0.1.0 - 64bit Production
Build label:    RDBMS_12.2.0.1.0_LINUX.X64_170125
ORACLE_HOME:    /opt/app/oracle/product/12.2.0/dbhome_1
System name:    Linux
Node name:      db1.com
Release:        5.4.17-2136.316.7.el8uek.x86_64
Version:        #2 SMP Mon Jan 23 18:37:18 PST 2023
Machine:        x86_64
Instance name: NI00
Redo thread mounted by this instance: 1
Oracle process number: 441
Unix process pid: 1172699, image: oracle@db1.com (TNS V1-V3)

*** 2023-05-15T08:46:12.761019-05:00
*** SESSION ID:(8962.49880) 2023-05-15T08:46:12.761031-05:00
*** CLIENT ID:() 2023-05-15T08:46:12.761035-05:00
*** SERVICE NAME:(SYS$USERS) 2023-05-15T08:46:12.761038-05:00
*** MODULE NAME:(SQL*Plus) 2023-05-15T08:46:12.761042-05:00
*** ACTION NAME:() 2023-05-15T08:46:12.761045-05:00
*** CLIENT DRIVER:(SQL*PLUS) 2023-05-15T08:46:12.761047-05:00
 
Hctx: MV[0] = TEMPLATE43_MV num_steps = 0 
Hctx: TBL[0] = TEMPLATE43_DATA  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[1] = DAILY_RANK  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[2] = RANK_TYPES  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[3] = INDUSTRY_SECTION_DATA_SP500  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[4] = STOCK_DATA  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[5] = YESOP_EARNINGS_SURPRISES  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[6] = ZERN_SURPHIST  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[7] = ZERN_SURPHIST  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[8] = NFM_YESOP_INTRA  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[9] = COMP_NAME_AP  (ins, del, up, dl) = (0 0 0 0)
Hctx: TBL[10] = UBER_MASTER_MV  (ins, del, up, dl) = (0 0 0 0)

除了MV刷新完成的事实之外，这真的告诉我们什么信息。为什么每次刷新都会生成一个？我们是不是该把它关掉？
非常感谢您的一些见解。