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database
Oracle Database 12c 因為有 multitenant container database (CDB) 及 pluggable databases (PDBs) 的功能，所以在建立帳號時，就必需要指定。不然會有錯誤訊息：ORA-65096: invalid common user or role name [oracle@oradb12clinux ~]$ echo $ORACLE_SID orcl [oracle@oradb12clinux ~]$ sqlplus / as sysdba SQL> show con_name CON_NAME —————————— CDB$ROOT SQL> create user abcd identified by
database
https://docs.oracle.com/cd/B28359_01/server.111/b28310/diag001.htm#ADMIN11258 The V$DIAG_INFO view lists all important ADR locations for the current Oracle Database instance. SELECT * FROM V$DIAG_INFO; INST_ID NAME VALUE ------- --------------------- ------------------------------------------------------------- 1 Diag Enabled TRUE 1 ADR Base /u01/oracle
Hardware
https://www.youtube.com/watch?v=Tdlhe00DfGE
Hardware
Let’s say you purchase a couple of 300s on the Ebay and someone forgot to reset config but you can’t get in as all default passwords got changed. Here’s what we need to do: 1. Connect to the serial console port of the switch (make sure to
file system
I've been using btrfs since 2012, and while as of 2014, it's far from done, it's gone a long way in that time. I thought I'd post some tips and scripts from things I've learned through my own use and
Monitor
This title introduce how to configure as title description. 1. grafana_5.0.4_amd64.deb which install at Ubuntu xenial server which IP 172.22.4.101 default login account admin, password admin 2. At ubuntu server , run apt-get install influxdb 3. We plan to monitor IOMC server that
Monitor
How to install netdata bash <(curl -Ss https://my-netdata.io/kickstart-static64.sh) Edit netdata.conf at /opt/netdata/etc/netdata [global] # glibc malloc arena max for plugins = 1 hostname = R720-H17-51 history = 3996 update every = 1 config directory = /opt/netdata/etc/netdata log directory = /opt/netdata/var/log/netdata web
file system
https://wiki.archlinux.org/index.php/Sparse_file This article contains information regarding sparse files, their creation, maintenance, and expansion. Contents [hide] * 1Sparse Files * 1.1What is a sparse file? * 1.2Advantages * 1.3Disadvantages * 2Creating sparse files * 2.1Making existing files sparse * 2.2Formatting the file with a filesystem * 2.
backup
Problem How to configure multiple data streams to backup data using NetBackup 7.1? Solution 1. Increase number of option "Maximum jobs per client" in master server 's host preperties –>globle attributes; 2.Increase number of option "Maximum concurrent write drives" in storage unit&
Buffer
http://crazyvlan.blogspot.tw/2010/11/dell-md3000i-slow-write-speed-cache.html I stumbled across a problem earlier this year with PowerVault MD3000i SAN array and didn't find a specific resolution for this storage, so I though I write about it here so you can solve it easier. When you buy the
Benchmark
Tuning Xen for Performance Contents [hide] * 1Tuning your Xen installation: recommended settings * 1.1Storage options * 1.2Memory * 1.3Dom0 vCPUs * 2Tuning your Xen installation: advanced settings * 2.1HAP vs. shadow * 2.2PV vs PV on HVM * 2.3vCPU Pinning for guests * 2.4vCPU Soft Affinity for guests * 2.5TCP Small
backup
1. On NBU Java Console to search all of backup id on catalog then select all and expire backup id 2. cd /usr/openv/netbackup/bin/admincmd ; ././nbdelete -allvolumes -force