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PostgreSQL rocks, except when it blocks: Understanding locks

At Citus Data, we engineers take an active role in helping our customers scale out their Postgres database, be it for migrating an existing application or building a new applica...

goland 工具安装

软件下载地址 https://www.jb51.net/softs/595215.html http://jjbig.lvith.cn:8080/201801/tools/GoLand2017_jb51.rar 安装手册 http://www.3322.cc/soft/35994.html#xzdz IntelliJ IDEA 20...

04/07 17:31
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shell getopts template

!/bin/bash # ------------------------------------------------------------------ # [Author] Title # Description # ----------------------------------------------------------------...

02/21 23:10
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shell usage file

#!/bin/ksh #================================================================ # HEADER #================================================================ #% SYNOPSIS #+ ${SCRIPT_N...

02/21 23:08
8
浅谈Service Mesh体系中的Envoy

https://blog.csdn.net/yunqiinsight/article/details/81019255

01/16 09:17
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看图理解 rocksdb

它是一个高性能的Key-Value数据库。设计了完善的持久化机制,同时保证性能和安全性。能够良好的支持范围查询,因为K-V记录就是按照Key来排序的。 下图为写入的流程: 可以看到主要的三个组成...

2018/12/23 21:55
59
oracle dba sql

--@db_cache_size COLUMN size_for_estimate FORMAT 999,999,999,999 heading 'Cache Size (MB)' COLUMN buffers_for_estimate FORMAT 999,999,999 heading 'Buffers' COLUMN estd_physical_...

2018/12/03 17:13
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高效使用mysql

本文主要总结了工作中一些常用的操作及不合理的操作,在对慢查询进行优化时收集的一些有用的资料和信息,本文适合有MySQL基础的开发人员。 一、索引相关 1、索引基数 基数是数据列所包含的不...

2018/11/28 08:40
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ORA-38856 之 Rac 库恢复具体时间点至单实例

恢复步骤略 查看恢复的日志日志点 RMAN> list backup of archivelog time between "to_date('2018-11-10 00:00:01','yyyy-mm-dd hh24:mi:ss')" and "to_date('2018-11-13 23:59:59','yyyy-m...

2018/11/27 09:22
23
CentOS 7中Nginx1.9.5编译安装教程systemctl启动

先安装gcc 等 yum -y install gcc gcc-c++ wget 然后装一些库 yum -y install gcc wget automake autoconf libtool libxml2-devel libxslt-devel perl-devel perl-ExtUtils-Embed pcre-deve...

TiDB Executive Summary

一、重要文档 ● 【TiDB 中文文档】 https://pingcap.com/docs-cn ● 【FAQ】 https://pingcap.com/doc-FAQ-zh ● 【OPS】https://www.tidb.cc 二、TiDB 的技术原理 ● 【TiDB 技术内幕】 ○...

2018/10/27 20:34
58
linux systemd 使用

Systemd 使用手册 https://www.freedesktop.org/software/systemd/man/systemctl.html How to write startup script for systemd https://unix.stackexchange.com/questions/47695/how-to-wr...

2018/10/22 16:21
15
shell中$(( )) 与 $( ) 还有${ }的区别

$( ) 与 ` ` (反引号) 在 bash shell 中,$( ) 与 ` ` (反引号) 都是用来做命令替换用(command substitution)的。 所谓的命令替换与我们第五章学过的变量替换差不多,都是用来重组命令行: ...

2018/10/13 14:12
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oracle sniped session

What does 'SNIPED' status in v$session mean? When IDLE_TIME is set in the users' profiles or the default profile. This will kill the sessions in the database (status in v$sessio...

2018/10/12 08:55
23
oracle查看物理IO前十的表

SELECT TABLE_NAME,TOTAL_PHYS_IO FROM ( SELECT OWNER||'.'||OBJECT_NAME AS TABLE_NAME, SUM(VALUE) AS TOTAL_PHYS_IO FROM V$SEGMENT_STATISTICS WHERE OWNER!='SYS' AND OBJECT_TYPE='TA...

2018/10/03 08:54
35
oracle LOCAL=YES/NO on TNS Connections

Description OF LOCAL=YES on TNS Connections (Doc ID 158281.1) Problem Description ------------------- You see a number of processes on server as follows: oracleSID(DESCRIPTION=(...

2018/10/02 17:26
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oracle_DBA 管理之归档日志管理sql

查当天每小时的归档日志生成量 select logtime, count(*), round(sum(blocks * block_size) / 1024 / 1024) mbsize from (select trunc(first_time, 'hh') as logtime, a.BLOCKS, a.BLOCK_.....

2018/09/10 10:03
22
linux gz 文件内容替换

对于gz 比较大 直接解压有问题,直接替换后打包成压缩文件 gunzip < file.gz | sed -e 's/search_str/replace_str/g' | gzip -c > temp.gz mv temp.gz file.gz gunzip ur_file.gz | awk 's/u...

2018/09/08 21:25
170
rocksdb, raft and tidb

rocksDB https://www.percona.com/live/data-performance-conference-2016/sites/default/files/slides/RocksDB_Siying_Dong.pdf https://github.com/facebook/rocksdb/wiki/RocksDB-Basics ...

2018/08/31 15:40
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