昨天看到一个同事在通过PL/SQL Developer工具把文本数据往oracle表;有两个文本；一个有30万条记录；一个7万多条记录。
在导入到过程中；出现错误记录还需要点击确认。不过使用黑科技（屏幕精灵）自动点击。单一个7万多记录的文本需要10分钟左右的时间。
看到这种情况；我热心肠爆发；我帮你来提快导入速度。我想到两种方案；
1：oracle的sqlldr命令
2：oracle的外部表；
由于文本存在错误记录；就选择1.
文本格式如下：存在有76760条记录
[oracle@oracle234 ~]$ wc -l lottu.txt
76761 lottu.txt
[oracle@oracle234 ~]$ head lottu.txt
stat_user_stay_info.rowkey,stat_user_stay_info.appkey,stat_user_stay_info.phone_softversion,stat_user_stay_info.dim_type,stat_user_stay_info.dim_code,stat_user_stay_info.time_peroid,stat_user_stay_info.stat_date,stat_user_stay_info.indicator,stat_user_stay_info.stat_time,stat_user_stay_info.value
3a00997_7c34d20170108,307A5C626E6C2F6472636E6E6A2F736460656473,2.14.0,cpid,blf1298_12243_001,1,20170105,stay3day,20170109102339,1
3a00997_bf86b20170108,307A5C626E6C2F6472636E6E6A2F736460656473,2.13.0,cpid,blp1375_13621_001,1,20170105,stay3day,20170109102339,7
3a00e87_4b11a20170126,337A5C626E6C2F6472636E6E6A2F736460656473,1.4.0,cpid,all,1,20170123,stay3day,20170127095931,6
3a0129a_6575220170118,307A5C626E6C2F6460726E742F716D7472,all,cpid,bsf1389_10917_001,1,20170116,stay2day,20170119094145,1
3a0183b_5764a20170202,307A5C626E6C2F6472636E6E6A2F736460656473,1.91,cpid,blf1298_12523_001,1,20170128,stay5day,20170203094327,1
3a01b9b_54b4720170123,307A5C626E6C2F6472636E6E6A2F736460656473,2.13.0,cpid,blp1375_13641_001,1,20170122,stay1day,20170124102457,3
3a0230d_7464120170126,307A5C626E6C2F6460726E742F606F65736E686569646D716473,all,cpid,bsp1405_13363_001,1,20170122,stay4day,20170127100446,18
3a02bed_3ea3320170206,307A5C626E6C2F6472636E6E6A2F736460656473,2.15.0,cpid,blp1375_14217_001,1,20170130,stay7day,20170207135438,1
3a03fe3_4c5fe20170119,307A5C21626E6C2F6472776865646E21,all,cpid,bvf1328_10885_001,1,20170116,stay3day,20170120093733,1
导入表结果如下：
SQL> desc STAT_USER_STAY_INFO1;
Name Null? Type
----------------------------------------- -------- ----------------------------
JOBID VARCHAR2(64)
APPKEY NOT NULL VARCHAR2(200)
PHONE_SOFTVERSION NOT NULL VARCHAR2(32)
DIM_TYPE NOT NULL VARCHAR2(64)
DIM_CODE NOT NULL VARCHAR2(64)
TIME_PEROID NOT NULL VARCHAR2(4)
STAT_DATE NOT NULL VARCHAR2(500)
INDICATOR NOT NULL VARCHAR2(200)
STAT_TIME VARCHAR2(500)
VALUE NOT NULL NUMBER
执行sqlldr命令；但结果呢？只导入5万条记录；结果出乎意料。
sqlldr 'lottu/li0924' control=/home/oracle/stay_info.ctl log=/home/oracle/stay_info.log bad=/home/oracle/stay_info.bad
查看log文件;由于篇幅的问题;只取关键部分。
.......
Record 55076: Rejected - Error on table STAT_USER_STAY_INFO1, column DIM_CODE.
ORA-01400: cannot insert NULL into ("LOTTU"."STAT_USER_STAY_INFO1"."DIM_CODE") MAXIMUM ERROR COUNT EXCEEDED - Above statistics reflect partial run. Table STAT_USER_STAY_INFO1:
55025 Rows successfully loaded.
51 Rows not loaded due to data errors.
0 Rows not loaded because all WHEN clauses were failed.
0 Rows not loaded because all fields were null. Space allocated for bind array: 165120 bytes(64 rows)
Read buffer bytes: 1048576 Total logical records skipped: 0
Total logical records read: 55105
Total logical records rejected: 51
Total logical records discarded: 0 Run began on Fri Feb 24 10:51:02 2017
Run ended on Fri Feb 24 10:51:09 2017 Elapsed time was: 00:00:06.87
CPU time was: 00:00:00.46
日志提示；只导入了“55025 Rows successfully loaded. ”；加上拒绝的51条；这跟76761条记录远远不够。
日志记录是不会骗人的；进入表中查看确实是55025条记录
SQL> select count(*) from STAT_USER_STAY_INFO1; COUNT(*)
----------
55025
奇了怪；明明76761条记录；为什么oracle只认可5万条记录 。还有2万多条记录为什么不认可呢？
其实oracle给了提示；就在刚刚那个log文件中。只是我忽略这样一句话"MAXIMUM ERROR COUNT EXCEEDED - Above statistics reflect partial run."。
这个意思是说；超过最大所容限错误数。
既然说得这么清楚了；我们在看看sqlldr命令
[oracle@oracle234 ~]$ sqlldr
SQL*Loader: Release 11.2.0.1.0 - Production on Fri Feb 24 11:00:08 2017
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
Usage: SQLLDR keyword=value [,keyword=value,...]
Valid Keywords:
userid -- ORACLE username/password
control -- control file name
log -- log file name
bad -- bad file name
data -- data file name
discard -- discard file name
discardmax -- number of discards to allow (Default all)
skip -- number of logical records to skip (Default 0)
load -- number of logical records to load (Default all)
errors -- number of errors to allow (Default 50)
rows -- number of rows in conventional path bind array or between direct path data saves
(Default: Conventional path 64, Direct path all)
bindsize -- size of conventional path bind array in bytes (Default 256000)
silent -- suppress messages during run (header,feedback,errors,discards,partitions)
direct -- use direct path (Default FALSE)
parfile -- parameter file: name of file that contains parameter specifications
parallel -- do parallel load (Default FALSE)
file -- file to allocate extents from
skip_unusable_indexes -- disallow/allow unusable indexes or index partitions (Default FALSE)
skip_index_maintenance -- do not maintain indexes, mark affected indexes as unusable (Default FALSE)
commit_discontinued -- commit loaded rows when load is discontinued (Default FALSE)
readsize -- size of read buffer (Default 1048576)
external_table -- use external table for load; NOT_USED, GENERATE_ONLY, EXECUTE (Default NOT_USED)
columnarrayrows -- number of rows for direct path column array (Default 5000)
streamsize -- size of direct path stream buffer in bytes (Default 256000)
multithreading -- use multithreading in direct path
resumable -- enable or disable resumable for current session (Default FALSE)
resumable_name -- text string to help identify resumable statement
resumable_timeout -- wait time (in seconds) for RESUMABLE (Default 7200)
date_cache -- size (in entries) of date conversion cache (Default 1000)
no_index_errors -- abort load on any index errors (Default FALSE)
PLEASE NOTE: Command-line parameters may be specified either by
position or by keywords. An example of the former case is 'sqlldr
scott/tiger foo'; an example of the latter is 'sqlldr control=foo
userid=scott/tiger'. One may specify parameters by position before
but not after parameters specified by keywords. For example,
'sqlldr scott/tiger control=foo logfile=log' is allowed, but
'sqlldr scott/tiger control=foo log' is not, even though the
position of the parameter 'log' is correct.
其中有一行内容“ errors -- number of errors to allow (Default 50)”
所以说上面出现问题就不奇怪了。
最后将sqlldr命令加errors参数即可。
sqlldr 'lottu/li0924' control=/home/oracle/stay_info.ctl log=/home/oracle/stay_info.log bad=/home/oracle/stay_info.bad errors=1000
整个过程20秒处理完成。相比之下；我那同事果断选择这种方法。