Recently we looked across some of the most common behaviors that our community of 25,000 users looked for in their logs with a particular focus on web server logs. In fact our research identified the top 15 web server tags and alerts created by our c…

Table of Contents Analyze MySQL PerformanceTuningSlow queries and Slowlog Brought to you by Rick James Analyze MySQL Performance When asked to analyze the performance of a MySQL server, there are two main tasks (tuning and slowlog) I like to start wi…

错误描述:请求“System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089”类型的权限已失败. 解决办法:在配置文件web.config中<trust></trust>节点,把<trust level="WSS_Minimal" originUrl=""…

最近在做一些OM Mapping的准备工作,新学了一招. 如果要将System.Data.Dbtype转换为System.Data.SqlDbType,以前以为要写Switch Case语句.其实有很简单的方法:         private System.Data.SqlDbType ConvertToSqlDbType(System.Data.DbType pSourceType)        {            SqlParameter paraConver = new SqlP…

.NET for Spark可用于处理成批数据.实时流.机器学习和ad-hoc查询.在这篇博客文章中,我们将探讨如何使用.NET for Spark执行一个非常流行的大数据任务,即日志分析. 1 什么是日志分析? 日志分析的目标是从这些日志中获得有关工具或服务的活动和性能的有意义的见解.NET for Spark使我们能够快速高效地分析从兆字节到千兆字节的日志数据! 在这篇文章中,我们将分析一组Apache日志条目,这些条目表示用户如何与web服务器上的内容交互.您可以在这里查看Apache日志…

OBLIVIATE redesigned ORAM for SGX filesystem operations for confuse access patterns to protect user privacy. Why All existing SGX filesystems are vulnerable to system call snooping, page fault, or cache based side-channel attacks. How Run isolated fi…

new DataRow 的方式: DataTable pDataTable = new DataTable(); DataRow pRow = new DataRow(); 正确的方式: DataRow pRow=pDataTable.newRow();…

WHAT'S IN THIS CHAPTER?n Code contractsn Tracingn Event loggingn Performance monitoringWROX.COM CODE DOWNLOADS FOR THIS CHAPTERThe wrox.com code downloads for this chapter are found at www.wrox.com/go/procsharp on the Download Code tab. The code for…

SQL Server 使用ErrorLog记录SQL Server启动和运行过程中的信息,具体信息参考:<SQLSERVER errorlog讲解>.通常来说,ErrorLog是指SQL Server Error Log,其实,SQL Server存在另外一种类型,SQL Server Agent ErrorLog,用于记录Agent的运行信息. 默认情况下,SQL Server 保存 7 个 ErrorLog 文件,分别命名为: ErrorLog,ErrorLog.n(n=1,2,3,4,5…

 GoldenGate配置(二)之双向复制配置 环境: Item Source System Target System Platform Red Hat Enterprise Linux Server release 5.4 Red Hat Enterprise Linux Server release 5.4 Hostname gc1 gc2 Database Oracle 10.2.0.1 Oracle 11.2.0.1 Character Set ZHS16GBK ZHS16GBK OR…

一.Goldengate双向复制配置 1.1.在进行如下配置之前,先在源数据库source system(原来的目标数据库)端 添加辅助的redolog配置: SQL>alter database add supplemental log data; SQL>alter system switch logfile; SQL>alter database force logging; 1.2.在原Source和原Target分别用scott用户创建一张emp_ogg表 SQL> cr…

Item Source System Target System Platform OEL5.4 OEL5.4 Hostname gc1 oraclelinux54.cuug.net Database Oracle 10.2.0.5 Oracle 11.2.0.3 Character Set Zhs16gbk Zhs16gbk ORACLE_SID PROD TDB112 Listener Name/Port LISTENER/1521 LISTENER/1521 Goldengate User…

博文结构图如下: 一.环境描述以及注意事项 1.1 环境简介 IP 系统 Oracle版本 OGG版本 源端 172.16.10.16/36 RHEL6.5 oracle11204 12.1 目标端 172.16.10.154 RHEL6.5 oracle11204 12.1 同步用户为:hr. 1.2 OGG网络带宽规划 GoldenGate数据同步所需的网络带宽是目前各种技术中最低的,复制全库数据时,通常GoldenGate队列文件大小与数据库日志大小的比例为1:4,GoldenGate网络…

本文介绍的日志不是事务日志,而是SQL Server 日志和代理的错误日志,按照主体把错误日志分为SQL Server.SQL Server Agent.Database Mail,以及 Windows NT.SQL Server使用日志记录数据库引擎启动和运行过程中产生的信息,这些信息可以分为三个级别,分别是:信息(Information),警告(Warning)和错误(Error),SQL Server日志会按照消息发生的时间记录这三类消息.SQL Server日志记录SQL Server…

linux下安装12c 重启linux之后,dbca PDB/CDB使用 SQL> select instance_name from v$instance; INSTANCE_NAME ------------------------------------------------ GORCL SQL> alter pluggable database p_orcl open; Pluggable database altered. SQL> alter session set con…

注意:在进行如下配置之前,先在源数据库(原来的目标数据库)端添加辅助的redolog配置:      1.SQL> alter database add supplemental log data;             SQL> alter system switch logfile;        2.alter database force logging;                否则启动extract进程会失败,使用view report eora_2查看详细信息时会显示如下…

第1章...... GoldenGate概述 1.1         GoldenGate技术原理 1.2         GoldenGate可靠的复制 1.3         GoldenGate支持操作系统和数据库类型 第2章...... 安装GoldenGate 2.1          安装GoldenGate环境 2.2          分别在源数据库,目标数据库安装GoldenGate 2.2.1       下载GoldenGate 2.2.2       解压 2.2.3  …

目录 1. 前言 2. List 2.1 fail-safe fail-fast知多少 2.1.1 Fail-fast Iterator 2.1.2 Fail-fast 的原理 2.1.3 Fail-safe Iterator 2.2 Iterator to list的三种方法 2.2.1 使用while 2.2.2 使用ForEachRemaining 2.2.3 使用stream 2.3 asList和ArrayList不得不说的故事 2.3.1 创建ArrayList 2.3.2 Unsu…

http://engineering.linkedin.com/distributed-systems/log-what-every-software-engineer-should-know-about-real-time-datas-unifying 主要的思想, 将所有的系统都可以看作两部分,真正的数据log系统和各种各样的query engine 所有的一致性由log系统来保证,其他各种query engine不需要考虑一致性,安全性,只需要不停的从log系统来同步数据,如果数据丢失或c…

主库查询最小scn 信息: SQL> col current_scn for 999999999999999 SQL>  SELECT CURRENT_SCN FROM V$DATABASE;    select min(fhscn) from x$kcvfh;    select min(f.fhscn) from x$kcvfh f, v$datafile d       where f.hxfil =d.file#         and d.enabled != 'READ ONLY'…

I’m going to go over some methods to import data from text files into SQL Server today. The particular file I went out and grabbed is comma delimited and with a few qualifiers in it. It is a typical file you may get and a request made to import or ju…

Cross-domain security for data vault is described. At least one database is accessible from a plurality of network domains, each network domain having a domain security level. The at least one database includes at least one partitioned data table tha…

ABSTRACT Recent technological advancement have led to a deluge of data from distinctive domains (e.g., health care and scientific sensors, user-generated data, Internet and financial companies, and supply chain systems) over the past two decades. The…

Introduction This chapter will present an implementation recipe for an enterprise log storage and a search and analysis solution based on the Storm processor. Log data processing isn't necessarily a problem that needs solving again; it is, however, a…

Sometimes, we should recover one or more rows data which is deleted carelessly by users, but it is not necessary to recover the whole db and the flashback does not recovery the data because it's timeout. For this moment, we should mine the log file t…

Writing Data You may want to jump right in and start throwing data into your TSD, but to really take advantage of OpenTSDB's power and flexibility, you may want to pause and think about your naming schema. After you've done that, you can procede to p…

https://github.com/onurakpolat/awesome-bigdata A curated list of awesome big data frameworks, resources and other awesomeness. Inspired by awesome-php, awesome-python, awesome-ruby, hadoopecosystemtable & big-data. Your contributions are always welco…

Transferring Data Without Draining the Battery GET STARTED DEPENDENCIES AND PREREQUISITES Android 2.0 (API Level 5) or higher YOU SHOULD ALSO READ Optimizing Battery Life In this class you will learn to minimize the battery life impact of downloads a…

deep api integration makes getting value from your big data easy 深度api集成使你大数据訪问更加easy Elasticsearch is quickly becoming the de facto search and analytics solution that organizations are using to provide real-time insights into their Hadoop data. Elas…

LogManager LogManager会管理broker上所有的logs(在一个log目录下),一个topic的一个partition对应于一个log(一个log子目录)首先loadLogs会加载每个partition所对应的log对象, 然后提供createLog,getLog,deleteLog之类的管理接口并且会创建些后台线程来进行,cleanup,flush,checkpoint生成之类的工作 /** * The entry point to the kafka log manage…