Database Administrator

The redo path is incorrect today, and the standby uard database cannot be open: ORA-01275: The add logfile operation is not allowed when backup file management is automatically performed Let's take a look at the following: Let's take a look at the

Add recordInsert into Table Name (field name, field name) VALUES (value, value );Delete recordDelete from table name WHERE condition (distinct Al can be left blank)Modify recordUPDATE table name SET field = value, field = value WHERE ConditionQuery

Use MongoDB in C ++: Add Field{$ Set: {"field": 1 }})Delete Field{$ Unset: {"field": 1 }}) Query elements in an array{"Keyword": {$ all: ["location", "other"]} Add array elements (repeated elements are not added){"$ AddToSet": {"keyword": {"$

There are many methods to implement the High-reliability MySQL solution. Using the built-in replication function of MySQL is the simplest one.The internal replication function of MySQL is implemented between two or more servers by setting the master-

When I got off work, the company's database was suddenly blocked. A buf table could not extract more than 20 million data and changed the program. The effect was not obvious. Since Oracle was restarted once before, I still want to restart oracle

Updatable materialized view description1. updatable materialized views must belong to a materialized view group.2. the updatable materialized view is always based on a single table, although multiple tables can be referenced in a subquery.3.

After running SQL statements in Linux sqlplus, you can use the up and down keys to find out the historical commands. Follow the steps below to set 1. Download rlwrap from 2. Install rlwrap [Root @ localhost] # tar-zxvf rlwrap-0.30.tar.gz[Root @

For RAC, the most important thing is to understand the internal principles and architecture. Installation is not very difficult. Both troubleshooting and maintenance are inseparable from the architecture and Internal principles. Cluster category 1.

1. To enable Python to operate the Oracle database, first install the cx_Oracle package. You can obtain the installation package through the following address:[Plain] Http://cx-oracle.sourceforge.net/ 2. You also need some class libraries of

In the previous test environment, the device symbols were directly used to map the binding method. In this case, the hard disk was added due to insufficient space, as a result, the new hard disk occupies the original ocr/dev/sdb, which will cause

Corrupt non-current online logs 1. Start the database, encountered a ORA-00312 or ORA-00313 error, suchORA-00313: open failed for members of log group 1 of thread 1ORA-00312: online log 1 thread 1: 'd: \ Oracle \ ORADATA \ TEST \ REDO01.LOG'Here we

# Create a userCreate user username identified by password;User: username and password: password # User authorizationGrant connect, resource to username;The User username is authorized to connect to the database and access resources. Automatically

Preface:Local Machine installation error alwaysUnsolvedIn the middle of the page, hope that the passing man will give you some advice. The error is as follows:1. the following error is prompted for scons all:/Usr/local/include/pcrecpp. h: 493:

Oracle's grid controller can be used to centrally manage oracle databases and middleware. It is very useful. It can also simplify the management of rac and dg on the grid controller. Tang sir has a famous saying: "rac with no grid controller is

Html code Android 2.3.3 Eclipse Version: 3.7.0 LogCat LogCat error message: 02-13 13:29:32.830: WARN/ActivityManager (62): Launch timeout has expired, giving up wake lock! 02-13 13:29:33.381: DEBUG/dalvikvm (17173): GC_CONCURRENT freed 771 K,

1. alter diskgroup dg_test add/drop disk is an asynchronous operation, and the Oracle background performs the REBALANCE operation. 2. When the ASMLIB discovery mark disk is located on multiple paths, only the first device is found by default. This

Symptom: mysql crashes when mysqldump exports data or accesses a table or data.The log is as follows:InnoDB: Database page upload uption on disk or a failedInnoDB: file read of page 26400.InnoDB: You may have to recover from a backup.120217 15:45:53

The Oracle Database modifies the index tablespace, including modifying the table tablespace, modifying the index tablespace, and modifying the tablespace with the CLOB field.Alter table space syntax1. Modify the table tablespace. Alter table

The PostgreSQL Project released the latest versions 9.1.3, 9.0.7, 8.4.11, and 8.3.18. These versions contain many bug fixes, some of which are security-related, users who use the pg_dump tool, SSL certificate, or trigger with security definer should

The ORA-12154: TNS: failed to parse the specified connection identifier at plsql login. The above situation may be caused by a problem with plsql preferences. In plsql (Simplified Chinese Version)Tools → preferences → connection → Oracle main