Oracle

Event: The report interface database was suddenly unable to connect, resulting in an inability to count operations properly. Exception information: Io exception: Got minus one from a read call analysis: The database address and its configuration

Control filesEach database has a control file, which is a binary data file that records the physical structure of the database. Control file database An important parameter file, when writing data, the control file must be a usable state. The

Grammar:Case SelectorWhen Exp1 then Res1When Exp2 then Res2When Exp3 then Res3...[ELSE RESN]EndSql> Declare2 Mygrade char (1): = ' A ';3 res varchar2 (20);4 begin5 Res: =6 Case Mygrade7 when ' A ' and ' The mark is 90-100 '8 when ' B ' and ' The

Modified the user password, the next day came to find the user is locked, walking in the evening is also good.Alter profile DEFAULT limit failed_login_attempts UNLIMITED;Alter user xxxx account unlock;Ok!--1.--System parameter configuration connect

1. Configuring CDB instance parameters, affecting CDB and all PDBThe parameters for the CDB configuration routines are not as varied as those for non-CDB databases. The alter system command is used to set initialization parameters and to modify some

Enter OEL Click Skip Click Next Select default Select default Select OK In the Red box, select Create custom layout Click New Select Swap,size in file System Type now 4096 At mount

Follow the configuration of your machine Processor configuration Follow the configuration of your machine Memory for this virtual machine Network type Select I/O Controller type Select disk Type Select disk

Change the data in a table: 1, update a specific row;2. Update all rows.Note: When updating, be sure to add a where condition, otherwise update all row data in the table.Format: Update a specific line: Updates tableSet table_xxx= ' aaaaaa 'where

To import a package:Import java.sql.Connection;Import Java.sql.DriverManager;Import java.sql.PreparedStatement;Import Java.sql.ResultSet;Import java.sql.SQLException;Declaring variables:private static String Usernamr = "LSDB"; Database user name, in

Sqlplus is a very concise management tool developed by Oracle, and Sqlplus is the best and most core Oracle management tool. Sqlplus is simple and efficient, giving up flashy, anti-basics. Using Sqlplus, go to Sqlplus and do a simple operation to

Timestamp data types in Oracle Many people use very little, so even the simplest query returns the results will not be clear exactly what the time point.For example:2 July-January-08 12.04.35.877000 amWhat time is it? 12:04 noon, that is wrong, in

The 11g Rman duplicate personal feel is a lot more advanced than 10g, 10g needs to replicate on the basis of Rman backup, using Rman duplicate to create a database with identical data but dbid different. The 11g Rman duplicate can be implemented in

first, the unloading of the original databasethe database unloading is not much to say, talk about the process:1. Running Oracle Uninstall, uninstalling Oracle Products2. Delete all Oracle related items under regedit3. Restart the machine4. SC

Oracle Date-Time range queryField: String type (char), Length: 101=1'2011-06-01'2011-07-05';Between To_date (' 2011-06-01 ', ' yyyy-mm-dd ') and to_date (' 20110705 ', ' yyyymmdd ');Field: String type (char), Length: 20SELECT * from Testdatetime t

Oracle has its own Dblink function, which is to logically treat multiple Oracle databases as a single database, meaning that objects in another database can be manipulated in one database, for example, we create a new data database1, We need to

--20170322--1.0--Update the statistics of the tableBeginDbms_stats.set_table_stats (user, ' EMP ', numrows = 10000);EndBeginDbms_stats.set_table_stats (user, ' DEPT ', numrows = 10000);End--Re-view the statistics of the tableSelect

Speaking of HWM, we'll start with a brief discussion of Oracle's logical storage management. We know that Oracle has 4 granularity on logical storage: Table space, segments, extents, and blocks.  (1) Block: is the smallest storage unit, now the

Other reasons to not walk the index:1. Set up a composite index, but the query predicate does not use the first column of the combined index, there is an index SKIP scan concept here.2. Index on table column containing null value, when using SELECT

Original blogger: http://blog.csdn.net/tianlesoftware/article/details/4843600Applies To:Oracle server-enterprise edition-version:10.1.0.5.0This problem can occur on any platform.Symptoms:The issue is, the following error was

Database written interview question Bank (Oracle, MySQL, etc.)⊙"DB written interview 67" in Oracle, about table partitioning the following description is incorrect ()⊙"DB written interview 65" in Oracle, which table partitioning method suggests a