Database Administrator

Expdp impdp Database Import and Export commands 1. Create a logical directory. This command does not create a real directory in the operating system. It is best to create a directory as an administrator such as system.Create directory dpdata1 as 'd:

Generate DEM using big data in AcGIS When DEM is generated in ArcGIS, the data sources used are usually some height points and contour lines. These height points and contour lines are dense and may contain tens of millions or even hundreds of

Query the size of a table with a lob field in the Oracle database.Note: Because the lob field has an independent lob segment for storage, for a table with a lob field, you cannot only query dba_segments.The following scripts are from:How to Compute

How to create and delete tablespaces in Oracle cainiao 1. When creating a temporary tablespace and creating a tablespace, dbf Files are generally stored in the directory where the datafile file is stored (typically under the folder named by instance

Restricted query and sorting display (Chapter Summary), Chapter Summary1. Standard data query syntax.SELECT [DISTINCT] * | column [AS] [alias], column [AS] [alias],...FROM table name [alias][WHERE condition (s)][Order by sorting field [ASC | DESC] [,

Generate DEM and acgisdem using big data in AcGIS When DEM is generated in ArcGIS, the data sources used are usually some height points and contour lines. These height points and contour lines are dense and may contain tens of millions or even

Subquery (Chapter Summary), subquery Chapter Summary1. Self-query refers to multiple small queries embedded in a complete query. According to different requirements, self-query can appear in any position of the query statement, but in FROM, WHERE

Export an empty table at oracle11g and at oracle11gDeferred_segment_creation Parameter This parameter indicates whether to create a segment immediately when an object (such as a table) is created without data at the beginning. The default value is

Create a sequence table in the data structure and a sequence of Data Structure Construction An ordered table refers to an array in which data elements continuously allocate addresses in the memory. Since the pointer cannot specify the length of the

Queries and supplements after database partitions and queries after database partitions -- View the partition and partition range. select * from sys. partitions where object_id = object_id ('secureusblog '); select * from sys. partition_range_values;

When case when encounters an empty string to 0, case empty stringNote: If the field is of the varchar type, quotation marks are required for the condition after when. SELECT (CASE 'marate_status' WHEN 0 then' married 'when 1 then' unmarried 'else'

MySQL Partitioning technology (I), mysql Partitioning technology 4: MySQL Partitioning technology (mysql 5.1 is used after version-> it is the technology that the maintenance personnel of the Oracle mysql Technical Team inserted into mysql as

Merge updates or inserts the same table. merge updates the table.For a business logic, you must first determine whether a record exists in the Database. If yes, update the record. If no record exists, insert the record.The practice before the

MySQL range partition (2), mysqlrange Partition MySQL range partitions are used most often. For details, see section 1. Example: Here is my personal learning Summary-> details --> if you have any questions, please come and talk about it.

One command one-click collection of oracle inspection information (including dbhc, awr reports), dbhcawr   The preliminary steps are as follows:   SQL> @ nb ------ Oracle Database health Check STRAT------ Starting Collect Data Information! ------

Mysql triggers and transaction operations, mysql trigger transactions Trigger syntax Create a trigger: Create trigger trigger_name trigger_time trigger_eventON tbl_name for each row trigger_stmt; Trigger_time is the time when the program is

Modify mysql-root password on mac-solve various permission problems, macmysql-root Official: http://dev.mysql.com/doc/refman/5.0/en/resetting-permissions.html#resetting-permissions-unix There is also a reference for mysql installation, with

Websphere installation and Enterprise Application Deployment [application cases] And websphere Application Cases Example of Websphere installation and Enterprise Application Deployment Environment Name Version Linux CentOS-5

Windows sqlplus/as sysdba report ora-12560 the ultimate solution, sqlplusora-12560Windows sqlplus/as sysdba report the ultimate solution of ora-12560Windows, sqlplus/as sysdba often report ORA-12560: TNS: protocol adapter error, solve this error,

C3P0 apparent deadlock, 1. After running c3p0 for a period of time, the following error is reported: W 07-26_00:58:27 ThreadPoolAsynchronousRunner.java 608 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@70929ab6 -- APPARENT