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Comparison of concurrency control (LOCK) between DB2 and Oracle Comparison of concurrency control (LOCK) between DB2 and Oracle 1 Introduction The minimal recovery and transaction units in relational databases (DB2, Oracle, Sybase, Informix, and

Oracle12c has a new feature that can archive data in the database, hide infrequently accessed data from the application, and set it to inactive. Of course, it can also be performed at the session level. Oracle 12c has a new feature that can archive

View the oracle database table lock example mdash; fault locating 1. Open a session session1 (actually, establish a connection with the database, you can use third-party software View the oracle database table lock example mdash; fault locating 1.

We have previously verified the defect of using the skewonly parameter to collect histograms in 10 GB and fixed it in 11 GB. The histogram is becoming more and more important in large data volumes. If not, the execution plan is likely to be

I have used ORACLE9i, oracle8 for a long time. I wrote out the issues that need attention in JSP for your reference only.I. How to deal with large types of Clob and BLOBCLOB can be used to store enlarged text data and store up to 4 GB of data, which

Single record function in SQL 1. ASCII returns the decimal number corresponding to the specified character; SQLselectascii (A) A, ascii (a) a, ascii (0) zero, ascii () spacefromdual; The AAZEROSPACE------------------------------------659748322.CHR

OracleFGA fine-grained Audit If you want to audit the table, it is a good choice to use FGA for a certain period of time, persons and DML statements. SQL> select * from v $ version;Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-64bit

Here we have added a list of oracle functions that are helpful to ORACLE beginners. If you need them, you can check them out. Here we have added a list of oracle functions that are helpful to ORACLE beginners. If you need them, you can check them

Adding notnull fields to Oracle11g is faster than 10g-New Features Adding a not null field before 11g is very slow, and it is very fast after 11g. We will first perform a test and then explore the principle. SQL> select * from v $ version;BANNER ----

The website provides the remove_constants function to check the SQL running status in the shared pool. The solution is to change the query condition value to a common tag, for example, select * fr. The website provides the remove_constants function

The partition index is a global partition index and a local partition index, and a global non-partition index (that is, a common index) is added. A total of three types of indexes are added. The organizational structure and application scenarios of

Today is. I was planning to mix the direction key index and other indexes into other index logs, but I still feel that this part is too important. Record the arrow key index notes here. What is a direction key index? The direction key index is also

Oracle analysis function ntile With such A requirement, the scores of the course are divided into four levels to provide A, B, C, and D Performance for students. Drop table course purge; create table course (id number, grade number); insert into

Oracle analysis function PERCENTILE_CONT Query the salaries of people with the salary distribution of 25%, 50%, and 75% in each department. percent_rank () is the relative position in the ranking. Create table EMP (empno number (4) not null, ENAME

Example of an external data experiment (5) modifying the column value on the primary key, the update operation will be split into two statements to continue the external data experiment (4) verify that the updata and delete operations result in

Differences between temporary tables in Oracle and temporary tables in SQL Server compared with the process of creating temporary tables in Oracle databases and the differences between temporary tables in SQL Server are the main content of this

I. general usage of Materialized views are a special physical table. Materialized views are relative to normal views. A common view is a virtual table, which has many application limitations. Oracle converts any View query to a view SQL statement

1. Verify installation and check whether there are missing packages # version of the required packages for uname-r or cat/proc/version2.6.9-34.EL or 2.6.18-8The program file is saved in the/opt/data directory.Linux 5: [root @ localhost ~] # Rpm-qa |

1. First, use RMAN for a backup (which must be backed up once) rmantargetbackupdatabase; orbackupdatabaseroot; backuppluggabledatabasepdb; 2. Create a test user in pdb and authorize the user; createusertestidentifiedbyr 1. first, use RMAN for a

Note: Create Table test03, switch logs, create table test04, switch logs, delete all data files, restore all backup data files, and do not need to restore control files; the archive log of test03 is not lost, and the archive log of test04 is lost.