1. 故障说明
某个二级系统的历史库经常告警文件系统满，检查数据库alert里主要是如下错误
Mon Feb 20 06:33:02 2017 Errors in file /oracle/diag/rdbms/xxxxxx/xxxxxx2/trace/xxxxxx2_ora_6449.trc (incident=1059057): ORA-00600: , : [ktugnb:clschk_kcbnew_14], [0], [1306], [4], [], [], [], [], [], [], [], [] Use ADRCI or Support Workbench to package the incident. See Note 411.1 at My Oracle Support for error and packaging details. Mon Feb 20 06:35:19 2017 Sweep [inc][1059057]: completed
每个trc文件都比较大，将近360M
$ ls -l /oracle/diag/rdbms/xxxxxx/xxxxxx2/trace/xxxxxx2_ora_6449.trc -rw-r----- 1 oracle oinstall 368950753 Feb 20 06:35 /oracle/diag/rdbms/xxxxxx/xxxxxx2/trace/xxxxxx2_ora_6449.trc
2. 检查trc文件
观察trc文件，没有发现processstate dump、systemstate dump或进程的error stack。
*** 2017-02-20 06:33:02.164 *** SESSION ID:(8679.41051) 2017-02-20 06:33:02.164 *** CLIENT ID:() 2017-02-20 06:33:02.164 *** SERVICE NAME:(xxxxxx_intf) 2017-02-20 06:33:02.164 *** MODULE NAME:(oracle@bssyc01 (TNS V1-V3)) 2017-02-20 06:33:02.164 *** ACTION NAME:() 2017-02-20 06:33:02.164 DDE: Problem Key 'ORA 600 [ktugnb:clschk_kcbnew_14]' was flood controlled (0x6) (incident: 1059057) ORA-00600: 内部错误代码, 参数: [ktugnb:clschk_kcbnew_14], [0], [1306], [4], [], [], [], [], [], [], [], [] BH (0x867ac8bd8) file#: 512 rdba: 0x80219ac8 (512/2202312) class: 7 ba: 0x866eae000 set: 53 pool: 3 bsz: 8192 bsi: 0 sflg: 1 pwc: 0,25 dbwrid: 1 obj: -1 objn: 0 tsn: 5 afn: 512 hint: f hash: [0xf1068a9c0,0xf1068a9c0] lru: [0x4a7ad7ee8,0x9c77c9b28] lru-flags: on_auxiliary_list ckptq: [NULL] fileq: [NULL] objq: [0x4d7926ad0,0x3175b7a70] objaq: [0x1c7ac36e0,0x9c77c9b60] st: SCURRENT md: NULL fpin: 'ktewh90: kteopshrink' tch: 1 atm: 2469056213,3134031615 flags: affinity_lock LRBA: [0x0.0.0] LSCN: [0x0.0] HSCN: [0xffff.ffffffff] HSUB: [65535]
在trc中搜索”DUMP REDO”和”END OF REDO DUMP”，发现整个trc文件完全就是在做dump redo
DUMP REDO Opcodes *.* DBAs (file#, block#): (512, 2202312) . SCNs: scn: 0x0000.00000000 thru scn: 0xffff.ffffffff **NOTE: Only Dumping Redo less then 12 hours** Times: 02/19/2017 18:33:02 thru eternity Initial buffer sizes: read 1024K, overflow 832K, change 805K Thread 1 low checkpoint scn: 0x0d51.155eb5c2 Thread 2 low checkpoint scn: 0x0d51.646e7a48 Thread 3 low checkpoint scn: 0x0d51.5ea2aca1 Thread 4 low checkpoint scn: 0x0d51.020d3a8b
3.诊断数据文件、数据块和数据字典
从以上信息来看，感觉不像是坏块造成的问题。使用dbv确认下
检查rdba: 0x80219ac8 (512/2202312)，问题数据块是file 512，block 2202312
SQL> set linesize 180 SQL> column owner format a15 SQL> column segment_type format a20 SQL> column segment_name format a30 SQL> column PARTITION_NAME format a30 SQL> column tablespace_name format a20 SQL> select owner, segment_type, segment_name, PARTITION_NAME, tablespace_name 2 from dba_extents 3 where file_id = 512 and 2202312 between block_id and block_id+blocks-1; OWNER SEGMENT_TYPE SEGMENT_NAME PARTITION_NAME TABLESPACE_NAME ------ ------------ ----------------------- -------------- -------------------- SYS TYPE2 UNDO _SYSSMU645_3190730853$ UNDOTBS2
检查dba_extents，是个UNDO回滚段上的块。
SQL> column name format a60 SQL> set linesize 180 SQL> select name, bytes/1024/1024 from v$datafile where file# = 512; NAME BYTES/1024/1024 ------------------------------------------------------------ --------------- /oradata05/xxxxxx/undotbs021.dbf 30720
dbv检查文件
$ dbv file=/oradata05/xxxxxx/undotbs021.dbf blocksize=8192 DBVERIFY: Release 11.2.0.4.0 - Production on Mon Feb 20 08:54:56 2017 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. DBVERIFY - Verification starting : FILE = /oradata05/xxxxxx/undotbs021.dbf DBVERIFY - Verification complete Total Pages Examined : 3932160 Total Pages Processed (Data) : 0 Total Pages Failing (Data) : 0 Total Pages Processed (Index): 0 Total Pages Failing (Index): 0 Total Pages Processed (Other): 3932159 Total Pages Processed (Seg) : 26 Total Pages Failing (Seg) : 0 Total Pages Empty : 1 Total Pages Marked Corrupt : 0 Total Pages Influx : 0 Total Pages Encrypted : 0 Highest block SCN : 1946904664 (3409.1946904664)
dbv没有发现问题，hcheck2也没有发现严重的数据字典问题。
SQL> @hcheck2.sql Package created. No errors. Package body created. No errors. HCheck Version 8i-11/2.00 Problem: Table with Dropped Func Index - Bug:1805146 / Note:148740.1 Table=SOLYG.OO_ROLE_BAK Table=SOLYG.BIN$RqXkSWYTvMHgUyJ25IRlug==$0 Problem: SEG$ bad LISTS/GROUPS (==1) - See Tar:2470806.1 May be Ok for LOBSEGMENT/SECUREFILE in release 11gR1+ Bad SEG$ lists/groups : TS#=1 RFILE#=2 BLK#=26585 TYPE#=8 Lists=2 Groups=1 Bad SEG$ lists/groups : TS#=1 RFILE#=2 BLK#=26769 TYPE#=8 Lists=2 Groups=1 Bad SEG$ lists/groups : TS#=1 RFILE#=2 BLK#=26841 TYPE#=8 Lists=2 Groups=1 Bad SEG$ lists/groups : TS#=1 RFILE#=2 BLK#=28177 TYPE#=8 Lists=2 Groups=1 Bad SEG$ lists/groups : TS#=1 RFILE#=2 BLK#=28217 TYPE#=8 Lists=2 Groups=1 Bad SEG$ lists/groups : TS#=1 RFILE#=2 BLK#=30985 TYPE#=8 Lists=2 Groups=1 Warning: Poor Storage Clauses (see Note:50380.1) Segment Next Exts Pct MaxExtents TABLE PARTITION INTFNJ.C2B_CHARGE_INFO_DOM 4194304 3726 0 2147483645 LOB PARTITION INTFNJ.SYS_LOB0000116925C00002$$ 4194304 23032 0 2147483645 TYPE2 UNDO SYS._SYSSMU938_4231872312$ 65536 3238 0 32765 TYPE2 UNDO SYS._SYSSMU937_4041523993$ 65536 3062 0 32765 TYPE2 UNDO SYS._SYSSMU936_1221781582$ 65536 3332 0 32765 TYPE2 UNDO SYS._SYSSMU935_3146848768$ 65536 3291 0 32765 TYPE2 UNDO SYS._SYSSMU934_1866944110$ 65536 4227 0 32765 TYPE2 UNDO SYS._SYSSMU933_1024713810$ 65536 4878 0 32765 TYPE2 UNDO SYS._SYSSMU931_2810395666$ 65536 4111 0 32765 TYPE2 UNDO SYS._SYSSMU930_3908463496$ 65536 4142 0 32765 TYPE2 UNDO SYS._SYSSMU929_1585153536$ 65536 4979 0 32765 TYPE2 UNDO SYS._SYSSMU927_3170835708$ 65536 4637 0 32765 TYPE2 UNDO SYS._SYSSMU926_3723058367$ 65536 3177 0 32765 TYPE2 UNDO SYS._SYSSMU925_3291508999$ 65536 3051 0 32765 TYPE2 UNDO SYS._SYSSMU924_1596601559$ 65536 3134 0 32765 TYPE2 UNDO SYS._SYSSMU923_1667892740$ 65536 3774 0 32765 TYPE2 UNDO SYS._SYSSMU922_1849719633$ 65536 4779 0 32765 TYPE2 UNDO SYS._SYSSMU921_2192954016$ 65536 4139 0 32765 TYPE2 UNDO SYS._SYSSMU920_2725127985$ 65536 4223 0 32765 TYPE2 UNDO SYS._SYSSMU918_3573760439$ 65536 3244 0 32765 TYPE2 UNDO SYS._SYSSMU917_3379111523$ 65536 3287 0 32765 TYPE2 UNDO SYS._SYSSMU916_3515060890$ 65536 3749 0 32765 TYPE2 UNDO SYS._SYSSMU915_101131120$ 65536 3220 0 32765 TYPE2 UNDO SYS._SYSSMU907_1775234225$ 65536 3328 0 32765 TYPE2 UNDO SYS._SYSSMU906_3848693682$ 65536 3031 0 32765 TYPE2 UNDO SYS._SYSSMU905_1886865273$ 65536 3145 0 32765 TYPE2 UNDO SYS._SYSSMU904_3470903090$ 65536 3464 0 32765 TYPE2 UNDO SYS._SYSSMU903_1952562153$ 65536 4682 0 32765 TYPE2 UNDO SYS._SYSSMU902_2058577437$ 65536 4498 0 32765 TYPE2 UNDO SYS._SYSSMU901_2344113227$ 65536 4819 0 32765 TYPE2 UNDO SYS._SYSSMU900_3528337659$ 65536 4191 0 32765 TYPE2 UNDO SYS._SYSSMU899_846588242$ 65536 3831 0 32765 TYPE2 UNDO SYS._SYSSMU898_704708852$ 65536 4559 0 32765 TYPE2 UNDO SYS._SYSSMU897_3636130941$ 65536 4840 0 32765 TYPE2 UNDO SYS._SYSSMU895_204505663$ 65536 3215 0 32765 TYPE2 UNDO SYS._SYSSMU894_197081962$ 65536 3527 0 32765 TYPE2 UNDO SYS._SYSSMU893_2125226544$ 65536 3374 0 32765 TYPE2 UNDO SYS._SYSSMU892_1153541173$ 65536 4263 0 32765 TYPE2 UNDO SYS._SYSSMU891_2342709071$ 65536 4485 0 32765 TYPE2 UNDO SYS._SYSSMU890_1583891555$ 65536 4946 0 32765 TYPE2 UNDO SYS._SYSSMU889_2632768257$ 65536 4176 0 32765 TYPE2 UNDO SYS._SYSSMU888_3906323271$ 65536 3155 0 32765 TYPE2 UNDO SYS._SYSSMU883_1996112263$ 65536 3222 0 32765 TYPE2 UNDO SYS._SYSSMU876_949884757$ 65536 3090 0 32765 TYPE2 UNDO SYS._SYSSMU875_294084533$ 65536 3037 0 32765 TYPE2 UNDO SYS._SYSSMU874_2807643372$ 65536 3324 0 32765 TYPE2 UNDO SYS._SYSSMU873_2664038720$ 65536 3407 0 32765 TYPE2 UNDO SYS._SYSSMU872_2621922310$ 65536 4513 0 32765 TYPE2 UNDO SYS._SYSSMU871_440471646$ 65536 4816 0 32765 TYPE2 UNDO SYS._SYSSMU870_3435505414$ 65536 4564 0 32765 TYPE2 UNDO SYS._SYSSMU869_3019833272$ 65536 4180 0 32765 TYPE2 UNDO SYS._SYSSMU868_4001372436$ 65536 3968 0 32765 TYPE2 UNDO SYS._SYSSMU866_2707579196$ 65536 4903 0 32765 TYPE2 UNDO SYS._SYSSMU865_3679288437$ 65536 3958 0 32765 TYPE2 UNDO SYS._SYSSMU864_582271685$ 65536 3409 0 32765 TYPE2 UNDO SYS._SYSSMU863_2321844127$ 65536 3719 0 32765 TYPE2 UNDO SYS._SYSSMU862_100644828$ 65536 3573 0 32765 TYPE2 UNDO SYS._SYSSMU861_3830381120$ 65536 4041 0 32765 TYPE2 UNDO SYS._SYSSMU860_3635191058$ 65536 4768 0 32765 TYPE2 UNDO SYS._SYSSMU859_2027211846$ 65536 4877 0 32765 TYPE2 UNDO SYS._SYSSMU858_249968420$ 65536 4148 0 32765 TYPE2 UNDO SYS._SYSSMU854_3544022160$ 65536 3940 0 32765 TYPE2 UNDO SYS._SYSSMU853_1746844385$ 65536 3382 0 32765 TYPE2 UNDO SYS._SYSSMU852_92342363$ 65536 3226 0 32765 TYPE2 UNDO SYS._SYSSMU845_1221568229$ 65536 3417 0 32765 TYPE2 UNDO SYS._SYSSMU843_2443249245$ 65536 3230 0 32765 TYPE2 UNDO SYS._SYSSMU842_2906526353$ 65536 3347 0 32765 TYPE2 UNDO SYS._SYSSMU841_3016203828$ 65536 4519 0 32765 TYPE2 UNDO SYS._SYSSMU840_4062347684$ 65536 4373 0 32765 TYPE2 UNDO SYS._SYSSMU839_1542798956$ 65536 4641 0 32765 TYPE2 UNDO SYS._SYSSMU838_1208375665$ 65536 4122 0 32765 TYPE2 UNDO SYS._SYSSMU837_1081106272$ 65536 4024 0 32765 TYPE2 UNDO SYS._SYSSMU836_2314529135$ 65536 5026 0 32765 TYPE2 UNDO SYS._SYSSMU835_311786953$ 65536 4848 0 32765 TYPE2 UNDO SYS._SYSSMU834_1141185982$ 65536 4920 0 32765 TYPE2 UNDO SYS._SYSSMU833_2086282319$ 65536 3356 0 32765 TYPE2 UNDO SYS._SYSSMU832_586346200$ 65536 3488 0 32765 TYPE2 UNDO SYS._SYSSMU831_2644752394$ 65536 3396 0 32765 TYPE2 UNDO SYS._SYSSMU830_2010129040$ 65536 4298 0 32765 TYPE2 UNDO SYS._SYSSMU721_2968429371$ 65536 3253 0 32765 TYPE2 UNDO SYS._SYSSMU720_1314530767$ 65536 3072 0 32765 TYPE2 UNDO SYS._SYSSMU718_146005813$ 65536 3487 0 32765 TYPE2 UNDO SYS._SYSSMU717_140527621$ 65536 3036 0 32765 TYPE2 UNDO SYS._SYSSMU822_652240805$ 65536 3504 0 32765 TYPE2 UNDO SYS._SYSSMU821_3664988286$ 65536 3226 0 32765 TYPE2 UNDO SYS._SYSSMU963_3916926274$ 65536 4749 0 32765 TYPE2 UNDO SYS._SYSSMU960_1546696045$ 65536 4961 0 32765 TYPE2 UNDO SYS._SYSSMU958_3373097762$ 65536 4751 0 32765 TYPE2 UNDO SYS._SYSSMU957_779883595$ 65536 3351 0 32765 TYPE2 UNDO SYS._SYSSMU955_1107697981$ 65536 3344 0 32765 TYPE2 UNDO SYS._SYSSMU951_2172604146$ 65536 4278 0 32765 TYPE2 UNDO SYS._SYSSMU812_1492684160$ 65536 3107 0 32765 TYPE2 UNDO SYS._SYSSMU690_1242221439$ 65536 3268 0 32765 TYPE2 UNDO SYS._SYSSMU687_3405220771$ 65536 3297 0 32765 TYPE2 UNDO SYS._SYSSMU686_4019061268$ 65536 4494 0 32765 TYPE2 UNDO SYS._SYSSMU685_845122282$ 65536 4977 0 32765 TYPE2 UNDO SYS._SYSSMU684_2042847591$ 65536 4691 0 32765 TYPE2 UNDO SYS._SYSSMU683_2817064289$ 65536 3893 0 32765 TYPE2 UNDO SYS._SYSSMU682_2533401056$ 65536 4007 0 32765 TYPE2 UNDO SYS._SYSSMU681_537367350$ 65536 5087 0 32765 TYPE2 UNDO SYS._SYSSMU680_3618789411$ 65536 4015 0 32765 TYPE2 UNDO SYS._SYSSMU679_3277798746$ 65536 4744 0 32765 TYPE2 UNDO SYS._SYSSMU678_1939303496$ 65536 3391 0 32765 TYPE2 UNDO SYS._SYSSMU677_1907565566$ 65536 3499 0 32765 TYPE2 UNDO SYS._SYSSMU676_1984137816$ 65536 3353 0 32765 TYPE2 UNDO SYS._SYSSMU675_841928499$ 65536 4034 0 32765 TYPE2 UNDO SYS._SYSSMU674_699725039$ 65536 4803 0 32765 TYPE2 UNDO SYS._SYSSMU673_2645343810$ 65536 4603 0 32765 TYPE2 UNDO SYS._SYSSMU672_2893885477$ 65536 4370 0 32765 TYPE2 UNDO SYS._SYSSMU671_3006873959$ 65536 3030 0 32765 TYPE2 UNDO SYS._SYSSMU670_1339746259$ 65536 3063 0 32765 TYPE2 UNDO SYS._SYSSMU669_3144845453$ 65536 3068 0 32765 TYPE2 UNDO SYS._SYSSMU667_2631341139$ 65536 3033 0 32765 TYPE2 UNDO SYS._SYSSMU666_2940587554$ 65536 3139 0 32765 TYPE2 UNDO SYS._SYSSMU659_1372182011$ 65536 3531 0 32765 TYPE2 UNDO SYS._SYSSMU647_3348747292$ 65536 3573 0 32765 TYPE2 UNDO SYS._SYSSMU646_419876432$ 65536 3554 0 32765 TYPE2 UNDO SYS._SYSSMU591_1053474162$ 65536 4882 0 32765 TYPE2 UNDO SYS._SYSSMU590_2952548938$ 65536 4266 0 32765 TYPE2 UNDO SYS._SYSSMU589_1059150673$ 65536 3989 0 32765 TYPE2 UNDO SYS._SYSSMU588_791066902$ 65536 4580 0 32765 TYPE2 UNDO SYS._SYSSMU587_1206424187$ 65536 5118 0 32765 TYPE2 UNDO SYS._SYSSMU586_2893738863$ 65536 4866 0 32765 TYPE2 UNDO SYS._SYSSMU585_3395283430$ 65536 3411 0 32765 TYPE2 UNDO SYS._SYSSMU584_3523634783$ 65536 3493 0 32765 TYPE2 UNDO SYS._SYSSMU583_1423446262$ 65536 3437 0 32765 TYPE2 UNDO SYS._SYSSMU582_2795545658$ 65536 4213 0 32765 TYPE2 UNDO SYS._SYSSMU581_1508811407$ 65536 4940 0 32765 TYPE2 UNDO SYS._SYSSMU580_980330471$ 65536 4731 0 32765 TYPE2 UNDO SYS._SYSSMU579_809160346$ 65536 3678 0 32765 TYPE2 UNDO SYS._SYSSMU578_801780972$ 65536 3065 0 32765 TYPE2 UNDO SYS._SYSSMU577_1297071939$ 65536 3091 0 32765 TYPE2 UNDO SYS._SYSSMU576_1788000116$ 65536 3248 0 32765 TYPE2 UNDO SYS._SYSSMU575_898229308$ 65536 3466 0 32765 TYPE2 UNDO SYS._SYSSMU574_408284076$ 65536 3461 0 32765 TYPE2 UNDO SYS._SYSSMU573_2591816604$ 65536 3065 0 32765 TYPE2 UNDO SYS._SYSSMU980_2221437149$ 65536 3004 0 32765 TYPE2 UNDO SYS._SYSSMU946_503850718$ 65536 3283 0 32765 TYPE2 UNDO SYS._SYSSMU827_3112501852$ 65536 4028 0 32765 TYPE2 UNDO SYS._SYSSMU20_3674116211$ 65536 3050 0 32765 TYPE2 UNDO SYS._SYSSMU17_1385764193$ 65536 3806 0 32765 TYPE2 UNDO SYS._SYSSMU16_3958334682$ 65536 3256 0 32765 TYPE2 UNDO SYS._SYSSMU15_3859920528$ 65536 3146 0 32765 TYPE2 UNDO SYS._SYSSMU969_2483651133$ 65536 3258 0 32765 TYPE2 UNDO SYS._SYSSMU966_4067110509$ 65536 3124 0 32765 TYPE2 UNDO SYS._SYSSMU965_4068933998$ 65536 4542 0 32765 TYPE2 UNDO SYS._SYSSMU964_1651538853$ 65536 4224 0 32765 TYPE2 UNDO SYS._SYSSMU962_1063866871$ 65536 4064 0 32765 TYPE2 UNDO SYS._SYSSMU961_4285108305$ 65536 4063 0 32765 TYPE2 UNDO SYS._SYSSMU956_3136563893$ 65536 3531 0 32765 TYPE2 UNDO SYS._SYSSMU954_4228453703$ 65536 4143 0 32765 TYPE2 UNDO SYS._SYSSMU953_1501298653$ 65536 4687 0 32765 TYPE2 UNDO SYS._SYSSMU952_3671889491$ 65536 4720 0 32765 TYPE2 UNDO SYS._SYSSMU950_2880314546$ 65536 3336 0 32765 TYPE2 UNDO SYS._SYSSMU949_237801430$ 65536 3203 0 32765 TYPE2 UNDO SYS._SYSSMU979_3314667799$ 65536 3027 0 32765 TYPE2 UNDO SYS._SYSSMU978_1744451194$ 65536 3924 0 32765 TYPE2 UNDO SYS._SYSSMU977_3800545299$ 65536 3369 0 32765 TYPE2 UNDO SYS._SYSSMU945_3508247264$ 65536 3152 0 32765 Found 8 potential problems and 159 warnings Contact Oracle Support with the output to check if the above needs attention or not PL/SQL procedure successfully completed.
4.Bug 23328319
从0x80219ac8的BH转储来看，问题可能发生在”st: SCURRENT md: NULL fpin: ‘ktewh90: kteopshrink'”，可能是在做shrink操作。
BH (0x867ac8bd8) file#: 512 rdba: 0x80219ac8 (512/2202312) class: 7 ba: 0x866eae000 set: 53 pool: 3 bsz: 8192 bsi: 0 sflg: 1 pwc: 0,25 dbwrid: 1 obj: -1 objn: 0 tsn: 5 afn: 512 hint: f hash: [0xf1068a9c0,0xf1068a9c0] lru: [0x4a7ad7ee8,0x9c77c9b28] lru-flags: on_auxiliary_list ckptq: [NULL] fileq: [NULL] objq: [0x4d7926ad0,0x3175b7a70] objaq: [0x1c7ac36e0,0x9c77c9b60] st: SCURRENT md: NULL fpin: 'ktewh90: kteopshrink' tch: 1 atm: 2469056213,3134031615 flags: affinity_lock LRBA: [0x0.0.0] LSCN: [0x0.0] HSCN: [0xffff.ffffffff] HSUB: [65535]
在MOS上搜索”ktewh90: kteopshrink”，发现了如下几个BUG：
Bug 25208060 : ORA-00600 [KTUGNB:CLSCHK_KCBNEW_14]
Bug 18521169 : ORA-600[KTUGNB:CLSCHK_KCBNEW_14]
Bug 23328319 : ORA-600 KTUGNB:CLSCHK_KCBNEW_14
这些BUG，暂时没有workround和fix
5.建议
既然没有解决这个bug的办法，只有想其它办法了：
SQL> alter system set events '10555 trace name context forever, level 1'; SQL> alter system set events '10736 trace name context forever, level 2';
因为从lru-flags: on_auxiliary_list看，可能问题发生在buffer cache的辅助链上。
SQL> alter system flush buffer_cache;
从同事的信息来看，这个问题他前面已经看到了，刷buffer_cache无法解决问题。
设置了10555和10736这两个Event后，trc的生成大小从360M降到几十K，大大缓解了/oracle文件系统的压力。
从每次ORA-00600 [ktugnb:clschk_kcbnew_14]涉及的数据块来看，基本都是UNDO数据块，新建UNDO表空间切换，再看情况。
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