Database Administrator

The VM for Linux prefers system cache over application memory. What does this mean? The best way I can explain is by example. Imagine you have 32 GB of RAM MySQL is set to take 20 GB of RAM for a process based buffer and up to 6 M for the varous

Oracle 9.04 is installed on Ubuntu Server 10.2 today. When it is installed to 80%, the all_no_orcl error occurs.Open the log file as prompted and find the following error:Information: Creating/opt/oracle/lib/liborasdkbase. so.10.2 Information:

MySQL triggers are basically described in every Mysql tutorial, but I found that the tutorials are about how to process data from other tables. When writing a trigger in MySQL to operate the column data of this table, the writing method is different

Log_archive_dest_n allows you to set the archive location, which can be a remote location or a local location. You can configure 10 locations. For example, you can set it to point to the backup node server, it helps to ensure the security of

After Oracle successfully acquires Sun, it will have two ides: NetBeans and JDeveloper. In the long run, Oracle is likely to support only one of them. Which one should it be? Adam Bien, a professional consultant, lecturer, and software architect,

When PL/SQL is used for import, an error occurs: IMP-00032: the SQL statement exceeds the buffer length. IMP-00008: the exported file contains unrecognized statements. At first, I thought it was because the Large_Pool settings of the database

Although few users use the MySQL client in Linux to maintain data, there are now more MySQL client management software, and toad for mysql free is a well-known one. however, users who are familiar with using sqlplus to manage Oracle in UNIX still

After upgrading Ubuntu 9.10 and detecting MySQL startup failure, the following error message is written to the record file: Shell code Mysqld: error while loading shared libraries: libstdc ++. so.5: cannot open shared object file: No such file or

Welcome to phpMyAdmin 2.7.0-pl1 PhpMyAdmin tries to connect to the MySQL server, but the server rejects the connection. Check the host, user name, and password in config. inc. php and confirm that the information is consistent with the information

-- Found that those SQL statements run a lot of PARSE Select SQL _text, parse_cils, executions from v $ sqlarea order by parse_cils desc; -- Overall PARSE of SYS Select name, value from v $ sysstat where name like 'parse count % '; -- CPU space and

I am wondering how to assign values to Blob objects. Image bb = Bitmap. FromFile (@ "f: \ abc. Gif"); // define the Image positionSystem. IO. MemoryStream MS = new System. IO. MemoryStream ();Bb. Save (MS, System. Drawing. Imaging. ImageFormat. Gif)

1. Index in SQL Server An index is a disk structure associated with a table or view, which can accelerate the speed of retrieving rows from a table or view. An index contains keys generated by one or more columns in a table or view. These keys are

Some small functions in OracleRequirement: A. A string in the database table may contain"+"Example: ORC+001 It may not include"+"B. If the string contains"+", Then"+"Character example: ORC+001ORCC. If the string does not contain"+", The string is

Today I saw a little questions about ocp, I did a small experiment, encountered two errors of ORA-02097 and ORA-00837; Question: Q484. You set the following parameters in the parameter fileand restarted the database: MEMORY_MAX_TARGET =

In some cases, for example, the listener. ora of the standby database needs to be configured for static registration when data guard is used. 1. listener. ora: [Oracle @ bys001 admin] $ cat listener. ora# Listener. ora Network Configuration File:/u01

In the shutdown status, the database only has the PLSExtProc service and is in an unknown state. The database is in the nomount status and has SID, SIDXDB, SID_XPT, and PLSExtProc services. The SID, SIDXDB, and SID_XPT services are in the

Usage: Require_once ("backdata. class. php ");$ Link = @ mysql_connect ("localhost", "Database Name", "password") or die ('could not connect to server .');Mysql_query ("use cms", $ link );Mysql_query ("set names utf8", $ link ); $ Dbbck = new

Configure the database environment, goldengate users, and install goldengate. For details, refer to the configuration required to complete two-way Oracle-Oracle replication without using the Data Pump: -- Here I only configure to synchronize the

I. Shared pool function: cache the execution plan of SQL statements and SQL statementsSQL statement execution Step 3: parsing (parse) ------ execute (exec) ------ get data (fetch) Composition of the shared pool:Three regions: free, librarycache, and

The word "filter" is confusing. a subnode, two subnodes, and three subnodes can be mounted at the next level .... Apply a subnode to filter data. For example, after a full table is scanned, the data that does not meet the conditions is