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http://www.docin.com/p-242937090.html列存储因同一类型数据在一列使得压缩更加容易，压缩比更高，数据+索引大小也比原始数据的大小小很多。 传统数据库中因为数据的预先处理，物化视图，以及基于行的索引，数据膨胀到原始数据的 3~6倍基本都很常见。 IQ向表中增加或加载一列数据如同传统关系数据库中增...

ln -s  /dev/raw/raw24  /data01/iqdm/data/iq_dmprj_01.iq  create  dbspace  dmprj  using PATH  '/data01/iqdm/data/iq_dmprj_01.iq' ;  create ls policy  iqdm_dmprj_logical_server_policy dqp_enabled=0 login_redirection=onredirecti...

Shared-nothing multiplex is a multiplex storage architecture for massively parallel processing of big data, wherein primary data is stored on a set of direct-attached storage (DAS) devices spread across a set of servers, rather than on a shared storage area network (SAN).A traditional SA...

SAP IQ 16 SP101.   设置core file size vi    /etc/security/limits.conf ,  加入*　　soft   core   unlimited *　　hard   core   unlimited 备注：     测试发现，其实设置   *   ha...

9. 第二个节点已经down掉，我们删除其中的事务日志log文件，运行如下语句从协调节点同步catalog db. dbbackup -y -d -c "uid=dba;pwd=sql;links=tcpip{10.x.2.2;port=10000};eng=iqdm_s01"  /data01/iqdm设置日志路径： dblog -r -t   iqdm.log   iqdm.db10. 在协调节点查看集群状态，sp_iq...

iqdm.iqmsg ---------------- I. 09/07 14:48:05. 0000000006    O/S Err#: 0, ErrID: 2094 (s_readexception); SQLCode: -1009044, SQLState: 'QSA44', Severity: 23I. 09/07 14:48:05. 0000000006 [20065]: An IO error was encountered while reading a database page in INVALID_DBSPACE DBSpac...

Keywords "sp_mpxprocesstlvlog exception", "cannot maintain catalog sync"    因为将1T Size的文件恢复到新的主机，新主机上的raw device每个LUN为1.5T, 导致500G的空间不能被合理使用， 我们采用加入一个 1.5T 的RAW DEVICE, 然后将原来的文件read only , 然后通过 sp_iqemptyfile 方式转移数...

import csv def txt2csv(inputfile,outputfile):    datacsv = open(outputfile,'w')    csvwriter = csv.writer(datacsv,dialect=("excel"))    mainfileH = open(inputfile,'rb')    for line in mainfileH.readlines():           p...

练习例子：#!usrbinpython# Filename wqmodule.py def avg(a,b=1,c=2):   print (a+b+c)/3 #!/usr/bin/python# Filename: wqmodule_demo.py import  wqmodule print 'demo - avg is ', wqmodule.avg(10)执行  python  wqmodule_demo.py 会返回:demo - avg is 4...

Oracle 11.2.0.4 RAC . oracle@dsp901@>$cd binoracle@dsp901@>$ls -al oracle-rwsr-s--x. 1 oracle oinstall 240399167 Dec 14 13:06 oracleoracle@dsp901@>$oracle@dsp901@>$srvctl stop database -d wqtstc oracle@dsp901@>$pwd/oracle/db/11.2.0.4/binoracle@dsp901@>$ls -l oracle-rwsr-s--x. 1 ...

ORA-27090 - Unable to Reserve Kernel Resources for Asynchronous Disk I/O (文档 ID 579108.1)SOLUTIONThe "aio-max-nr" kernel limit should be adjusted according to Oracle recommendations which are available in this document: Oracle Validated Configuration:http://linux.oracle.com/pls/apex/f?p...

在主库上查询同步情况： select dest_id,dest_name,error from v$archive_dest where dest_id=2 ; 发现报错  ORA-12528: TNS:listener: all appropriate instances are blocking new connections  方法一：配置数据库的监听为静态参数步骤：在ORACLE_HOME/network/admin 下面检查是否有listener.ora参数...