问题描述：
客户发现数据库上所有表的LOAD操作都很慢，即使只有一行数据，也需要一分多钟。
load from S40_F_LN_LNP_TEST.ixf of ixf REPLACE INTO ODS.S40_F_LN_LNP_TEST NONRECOVERABLE
SQL3109N The utility is beginning to load data from file
"/home/db2inst1/S40_F_LN_LNP_TEST.ixf".
SQL3500W The utility is beginning the "LOAD" phase at time "01/14/2016
10:55:14.580838".
SQL3150N The H record in the PC/IXF file has product "DB2 02.00",
date
"20160114", and time "105044".
SQL3153N The T record in the PC/IXF file has name
"S40_F_LN_LNP_TEST.ixf",
qualifier "", and source " ".
SQL3519W Begin Load Consistency Point. Input record count = "0".
SQL3520W Load Consistency Point was successful.
SQL3110N The utility has completed processing. "96" rows were read
from the
input file.
SQL3519W Begin Load Consistency Point. Input record count = "96".
SQL3520W Load Consistency Point was successful.
SQL3515W The utility has finished the "LOAD" phase at time "01/14/2016
10:55:14.719068".
Number of rows read = 96
Number of rows skipped = 0
Number of rows loaded = 96
Number of rows rejected = 0
Number of rows deleted = 0
Number of rows committed = 96
real 1m32.16s
user 0m0.02s
sys 0m0.01s
问题诊断：
在LOAD完成之前，收集了两次如下数据：
db2pd -stack all db2pd -eve >> db2pd.eve db2 "list utilities show detail" >> list.uti
1.）
db2pd -uti & db2 list utilites 均显示没有正在进行的load操作
2.）
诊断日志也显示，从load开始到load结束也只用了不到1S的时间 2016-01-14-11.02.58.024481+480 I205449A470 LEVEL: Warning PID : 13566098 TID : 47797 PROC : db2sysc 0 INSTANCE: db2inst1 NODE : 000 DB : AWPDB APPHDL : 0-34671 APPID: *LOCAL.db2inst1.160318130448 AUTHID : DB2INST1 EDUID : 47797 EDUNAME: db2agent (AWPDB) 0 FUNCTION: DB2 UDB, database utilities, sqluvtld_route_in, probe:839 DATA #1 : <preformatted> Starting LOAD operation (S) (3) (R). 2016-01-14-11.02.58.509794+480 I205920A498 LEVEL: Warning PID : 13566098 TID : 57577 PROC : db2sysc 0 INSTANCE: db2inst1 NODE : 000 DB : AWPDB APPHDL : 0-34671 APPID: *LOCAL.db2inst1.160318130448 AUTHID : DB2INST1 EDUID : 57577 EDUNAME: db2lrid 0 FUNCTION: DB2 UDB, database utilities, DIAG_NOTE, probe:0 DATA #1 : String, 81 bytes LOADID: 47797.2016-01-14-11.02.58.024466.0 (6;256) Load CPU parallelism is: 15, 0 2016-01-14-11.02.58.514353+480 I206419A565 LEVEL: Warning PID : 13566098 TID : 985 PROC : db2sysc 0 INSTANCE: db2inst1 NODE : 000 DB : AWPDB APPHDL : 0-34671 APPID: *LOCAL.db2inst1.160318130448 AUTHID : DB2INST1 EDUID : 985 EDUNAME: db2lfrm0 0 FUNCTION: DB2 UDB, database utilities, sqlulPrintPhaseMsg, probe:314 DATA #1 : String, 136 bytes LOADID: 47797.2016-01-14-11.02.58.024466.0 (6;256) Starting LOAD phase at 01/14/2016 11:02:58.514111. Table ODS .S40_F_LN_LNP_TEST 2016-01-14-11.02.58.677115+480 I206985A532 LEVEL: Warning PID : 13566098 TID : 57577 PROC : db2sysc 0 INSTANCE: db2inst1 NODE : 000 DB : AWPDB APPHDL : 0-34671 APPID: *LOCAL.db2inst1.160318130448 AUTHID : DB2INST1 EDUID : 57577 EDUNAME: db2lrid 0 FUNCTION: DB2 UDB, database utilities, sqlulPrintPhaseMsg, probe:314 DATA #1 : String, 104 bytes LOADID: 47797.2016-01-14-11.02.58.024466.0 (6;256) Completed LOAD phase at 01/14/2016 11:02:58.676938.
3.）那么剩下的一分多钟时间它在做什么呢？为什么迟迟没有返回，于是查看stack，stack显示它正在写历史文件
shows it's writing to history file. 13566098.47797.000.stack.txt <StackTrace> -------Frame------ ------Function + Offset------ 0x0900000000029F60 lseek64 + 0x20 0x090000000C6B62B8 lseek64@glue7B0 + 0x98 0x090000000ACD3A0C sqloseek + 0x128 0x090000000D0039C0 sqluhReadEntry__F12SQLO_FHANDLEP11SQLUH_ENTRYP14SQLUH_WORKAREAPcN34PUiC1 9SQLUH_ENTRY_VERSION + 0x154 0x090000000D0037BC sqluhUpdate + 0xCCC 0x090000000CC39ABC sqluCommitLoadEntryInHistoryFile__FP8sqeAgentP17SQLU_LOAD_HF_INFO + 0xF4 0x090000000CC316B0 sqlu_process_pending_operation__FP8sqeAgentiPcP9SQLP_LSN8P12SQLP_PENLIST PUiP15SQLD_RECOV_INFO + 0x1024 0x090000000CC7BBA0 sqlptppl__FP8sqeAgent + 0x490 0x090000000CC7B660 sqlptppl__FP8sqeAgent@glue15F6 + 0x74 0x090000000ACF4274 sqlpxcm1__FP8sqeAgentP15SQLXA_CALL_INFOi + 0x224 0x090000000E6BD8A4 sqlrrcom_dps__FP8sqlrr_cbiT2P15SQLXA_CALL_INFO + 0x16C 0x090000000E5F27BC sqlrrcom__FP8sqlrr_cbiT2 + 0x1C8 0x090000000E5F341C sqlrr_commit__FP14db2UCinterface + 0xD8 0x090000000CC8FAA8 sqluv_commit__FP8sqeAgentPiP5sqlcai + 0x450 0x090000000D093440 sqlu_register_table_load__FP26sqluCLoadRequestDescriptorP24sqlusCLoadMPP CoordinatorP15sql_static_dataPb + 0x27C 0x090000000D0AB8F8 sqluvtld_route_in__FP12SQLE_DB2RA_T + 0x889C 0x090000000D0CE118 sqluvtld_route_in__FP12SQLE_DB2RA_T@glue17E3 + 0x74 0x090000000B10632C sqlesrvr__FP14db2UCinterface + 0x4F4 0x090000000E3FB6E8 sqleMappingFnServer__FP5sqldaP5sqlca + 0x1A4 0x090000000E3FAFE8 sqlerKnownProcedure__FiPcPiP5sqldaT4P13sqlerFmpTableP8sqeAgentP5sqlca + 0x308 0x090000000E3F8C48 sqlerCallDL__FP14db2UCinterfaceP9UCstpInfo + 0x51C 0x090000000E3F92B8 .sqljs_ddm_excsqlstt.fdpr.clone.215__FP14db2UCinterfaceP13sqljDDMObject + 0xE4 0x090000000E5F92BC sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UCinterfac e + 0xFC 0x090000000E5F971C .sqljsParse.fdpr.clone.77__FP13sqljsDrdaAsCbP14db2UCinterfaceP8sqeAgentb + 0x240 0x090000000E5E1D44 @63@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0xAA8 0x090000000E3D6658 @63@sqljsDriveRequests__FP8sqeAgentP14db2UCconHandle + 0xA0 0x090000000E3D62CC @63@sqljsDrdaAsInnerDriver__FP18SQLCC_INITSTRUCT_Tb + 0x260 0x090000000E3D5D94 sqljsDrdaAsDriver__FP18SQLCC_INITSTRUCT_T + 0x1EC 0x090000000E4B43D8 RunEDU__8sqeAgentFv + 0x298 0x090000000E4A9D58 EDUDriver__9sqzEDUObjFv + 0xE4 0x090000000E4B1CFC sqloEDUEntry + 0x260 </StackTrace>
问题解决：
prune history文件之后，问题得到解决