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技术团队博客

HugePage-大页空间深度解析

内存标准页大小是4k，对于内存使用较多，访问内存又比较分散的场景，4k的页大小会导致页表（每个进程一个，用于索引内存物理地址）很大，cpu高速缓存又很小，会导致大量的页表项无法被高速
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MySQL执行计划初探

执行计划收集DAO_OBJECTS t1 , DAO_OBJECTS t2 WHERE deptno= t1.object_id AND t1.object_name=t2.object_name ;+----+-------------+-------+------+--------------
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为什么Python的64位安装包文件名是amd64

### Python安装包命名有很多学员经常会问一个问题，为什么Python的Windows安装包中，64位版本的文件名里是amd64，而不是Intel64或x64？例如：python-3.6.8-amd64.exe在这里，给大家讲一
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ORA-00025: failed to allocate string

ORA-00025: failed to allocate string
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Zookeeper安装与配置

## 上传安装介质```sql[root@bosenrui ~]# ll /usr/local/zookeeper-3.4.8.tar.gz -rw-r--r-- 1 root root 22261552 Jun 14 2016 /usr/local/zookeeper-3.4.8.tar.gz```##
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Kafka的安装与配置

## 安装Scala### 上传介质```sql[root@bosenrui ~]# cd /usr/local/[root@bosenrui local]# lltotal 123152-rw-r--r-- 1 root root 2442 Jan 25 02:04 1-rw-r--r--
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Azkaban安装实录

## 创建目录```sql[root@bosenrui ~]# mkdir /usr/local/azkaban```## 上传介质```sql[root@bosenrui ~]# cd /usr/local/azkaban/[root@bosenrui azkaban]# lltotal 22612-
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Flume安装使用实录

## 上传介质```sql[root@bosenrui local]# lltotal 51392-rw-r--r-- 1 root root 2442 Jan 25 02:04 1-rw-r--r-- 1 root root 52550402 Mar 29 2017 apache-flume
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Sqoop安装与使用实录

## 上传介质```sql[root@bosenrui ~]# cd /usr/local/[root@bosenrui local]# lltotal 17652-rw-r--r-- 1 root root 2442 Jan 25 02:04 1drwxr-xr-x. 2 root root
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Hbase安装实录

## 上传介质```sql[root@bosenrui ~]# cd /usr/local/[root@bosenrui local]# lltotal 102264-rw-r--r-- 1 root root 2442 Jan 25 02:04 1drwxr-xr-x. 2 root root
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Hive 安装配置实录

## 安装MySQL```sql[root@bosenrui ~]# rpm -e mysql-libs-5.1.73-3.el6_5.x86_64 --nodeps[root@bosenrui ~]# rpm -ivh MySQL-*warning: MySQL-client-5.6.29-1.linux_gli
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Hadoop安装配置实录

本文介绍了如何搭建Hadoop运行环境,并提供安装软件,虚拟机环境,视频的下载与观看.
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ORA-00024: logins from more than one process not allowed in single-process mode问题的原因和处理方法

ORA-00024: logins from more than one process not allowed in single-process modeCause: Trying to login more than once from different processes for ORACLE started
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ORA-00023: session references process private memory;问题的原因和处理方法

ORA-00023: session references process private memory; cannot detach sessionCause: An attempt was made to detach the current session when it contains references
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ORA-00022: invalid session ID; access denied问题的原因和解决方法

ORA-00022: invalid session ID; access deniedCause: Either the session specified does not exist or the caller does not have the privilege to access it.Action: Sp
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ORA-00021: session attached to some other process; cannot switch session问题的原因及处理方法

ORA-00021: session attached to some other process; cannot switch sessionCause: The user session is currently used by others.Action: Do not switch to a session a
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ORA-00020: maximum number of processes (string) exceeded问题的原因和处理方法

ORA-00020: maximum number of processes (string) exceededCause: All process state objects are in use.Action: Increase the value of the PROCESSES initialization p
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ORA-00019: maximum number of session licenses exceeded问题的原因和处理方法

ORA-00019: maximum number of session licenses exceededCause: All licenses are in use.Action: Increase the value of the LICENSE MAX SESSIONS initialization param
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ORA-00018: maximum number of sessions exceeded问题的原因和处理方法

ORA-00018: maximum number of sessions exceededCause: All session state objects are in use.Action: Increase the value of the SESSIONS initialization parameter.OR
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ORA-00017: session requested to set trace event问题的原因和处理办法

ORA-00017: session requested to set trace eventCause: The current session was requested to set a trace event by another session.Action: This is used internally;
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ORA-00001: unique constraint (string.string) violated问题的原因与处理办法

ORA-00001: unique constraint (string.string) violatedCause: An UPDATE or INSERT statement attempted to insert a duplicate key. For Trusted Oracle configured in
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Oracle隐含参数速查

Oracle隐含参数速查
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Oracle 脚本-查看失效对象信息

select owner , 2 object_name , 3 object_type 4 from dba_objects 5 where status ='INVALID' 6 order by 1,2,3 ;OWNER OBJEC
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Oracle 脚本-查看日志文件写平均等待事时间

```sqlSQL> select total_waits, 2 time_waited, 3 average_wait, 4 time_waited / total_waits as avg_time 5 from v$system_eve
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Oracle 脚本-查看平均每秒事务数

```sqlSQL> select (select sum(to_number(value, 99999999999)) 2 from v$sysstat 3 where name in ( 'user rollbacks','user commits') )/ 4
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