Row Exclusive mode, no commitBefore inserting the same record will not react, because after a 3 lock will wait for the last 3 lock, weYou must release the previous to continue working.Level 4 Lock is S lockThe corresponding SQL is: Create Index, Lock xxx in Share mode5 level lock is SRX lockThe corresponding SQL has: Lock xxx in Share Row Exclusive mode, update when there is a primary foreign KEY constraint/delete ...; A lock of 4, 5 may be generated.Level 6 lock is x lockThe corresponding SQL
The ORACLE tutorial is about space management of Oracle databases. In Oracle databases, DBAs can observe tables or views to understand the usage of the current space and make possible adjustments.I. Free Space for tablespaceBy observing the free space of a table space, you can determine whether the space allocated to a tablespace is too much or not. See the following statementsIt can be seen that only 0.19% of the allocated space in the tablespace RBS
. SQL in a database to obtain the following fsfi value:Tablespace_name fsfi-------------------------------------Rbs 74.06.System 100.00Temp22.82Tools 75.79Users' 100.00User_tools 100.00Ydcx_data 47.34Ydcx_idx 57.19Ydjf_data 33.80Ydjf_idx 75.55
---- Calculate the fsfi value of the database and use it as a comparable parameter. In a tablespace with sufficient free space and with a fsfi value greater than 30, the problem of free space is rare. When a spa
extended extent, you can send it to the DBA's pager. the readers can use the specific program to make full use of their imagination.
Mail sample:
Disk usage statistics for SZBMS at 01/10/00/08:30:01 AM Filesystem 512-blocks Used Available Capacity Mounted on /dev/rz16a 2321998 118050 1971748 6% / /proc 0 0 0 100% /proc /dev/rz16g 98520854 29853320 58815448 34% /usr /dev/rz1g 6090794 533640 4948074 10% /disk1 /dev/rz3g 4057676 1254588 2397320 35% /disk2 /dev/rz4c 34500632 27540166 35104
Fragmentation Index) value to intuitively reflect:
FSFI = 100 * SQRT (max (extent)/sum (extents) * 1/SQRT (count (extents )))
It can be seen that the maximum or value of FSFI is 100 (an ambitious single data table space ). With the increase of category, the FSFI value will land slowly, and the FSFI value will land quickly with the decrease of the maximum range.
The following script can be used to calculate the FSFI value:
Rem FSFI Value Compute
Rem fsfi. SQL
Column FSFI format 999,99
Select tab
RBS52323942435980083216343859231.235909
RBS1.610E+091.606E+093104768.19289495
RBSJF3.220E+092.716E+0950435686415.662396
SFGLTS2.146E+091.228E+0991815936042.776014
SFSJTS2.146E+091.526E+0962009344028.889457
SYSTEM5232394245992448046331494488.547407
TEMP52323942429491252294451299.943637
TOOLS1572864012582912314572820
USERS73400328192733184099.888393
rowsselected.
It can be seen that only 0.19% of the allocated space in the tablespace
to the tablespace.
Select tablespace_name,
Count (*) chunks,
Max (bytes/1024/1024) max_chunk
From dba_free_space
Group by tablespace_name;
The preceding SQL statement lists the idle blocks of each tablespace in the database, as shown below:
TABLESPACE_NAME CHUNKS MAX_CHUNK
----------------------------------------
INDX 1 57.9921875
RBS 3 490.992188
RMAN_TS 1 16.515625
SYSTEM 1 207.296875
TEMP 20 70.8046875
TOOLS 1 11.8359375
USERS 67 71.3671875
The CH
skills2. Training3. Team Building4. Basic rules5. Centralized Office6. Awards and recognition
1. Team Performance evaluation Report
Team management
1. Team Performance evaluation Report
1. Observation and Conversation2. Project performance evaluation3. List of issues4. Conflict management
1. Change Requests2. Project management Plan (update)
Iii. important points of knowledge1. Develop a human resources plan1.1.OBSOrganization breakdown structure (OBS)
standard.4. Corrective error correction.5, quality control process.1. Select the object you want to control.2. Determine the criteria and requirements for the objects to be controlled.3. Develop the implementation plan and determine the assurance measures.4. Implementation plan.5. Follow up the project implementation, check, monitor, and compare the inspection results with the plan or standard.6. Identify and analyze deviations.7. Take corresponding countermeasures according to the deviation.Se
() , Activity Network Diagram, also known as Arrow bar graph method, vector line diagram method, is the application of Network Diagram in quality management4 , quality management process;(1) , establish the quality standard system(2) , quality control of project implementation(3) , the actual and the standard control(4) , corrective error correction5 , quality control process. (1) , select the control object(2) , determining criteria or targets for control objects(3) , develop the implementation
)))return 0.0; the DoubleL=Dist_line (Line (P1,P2)); the DoubleA=dis (p1); - Doubleb=dis (p2); - DoubleC=dis (P1,P2); the if(aR) { the returnFabs (P1*P2)/2.0*F; the } the if(a>=rb>=rl>=R) { - Doubleang=Get_angle (P1,P2); the returnFabs ((ang/(2.0)) * (R*R)) *F; the } the if(a>=rb>=rl0|| Get_cos (b,a,c) 0)){94 Doubleang=Get_angle (P1,P2); the returnFabs ((ang/(2.0)) * (R*R)) *F; the } the if(a>=rb>=rl0get_cos (B,A
Apple XCode:Advantages: (1) You can automatically create a category chart.(2) automatically provides undo, redo, and save functions without writing any coding.Disadvantage: A plugin may become invalid after updating the version.OpenprojOpenproj is a free and open source application that works perfectly on UNIX, Linux, Windows or Mac systems. It's a replacement for all Microsoft Project desktop applications, and you can even open a local project file. The scheme has features such as cost accounti
collects 10 best free and open source project management tool, hoped to be helpful to you!OpenprojOpenproj is a free and open source application that works perfectly on UNIX, Linux, Windows or Mac systems. It's a replacement for all Microsoft Project desktop applications, and you can even open a local project file. The scheme has features such as cost accounting, network diagrams (PERT charts), Gantt charts, RBS, and WBS charts.GanttprojectThis is an
------- ---- ------- --------------- 179 1 94 Oct 03 11:26 179 1 95 Oct 03 11:26 14.2. Report
The REPORT command can also query the recovery directory, but the REPORT command syntax can be used to build instructions for more useful information. The REPORT command output can be saved to the Message Log File, however, MSGLOG or LOG must be specified when the connection is restored.
You can list files that cannot be recovered in all databases:
RMAN> report unrecoverable database;
Show all data fi
corresponding mark "RRB" of the SET command register. Receiving more messages in limit 0 will lead to a new reception interruption. Therefore, you cannot read all valid messages in limit 0 within one interruption period. After the receiving buffer is released, SJAl000 checks whether there are more packets in the receiving buffer status (RBS) in the Status Register. All valid messages are read cyclically.
5 conclusionIn this system, SJAl000 is used as
identified globallyGrant permission to role_name;
2. UsersCreate a user:Create user user_nameProfile "default"Identified by "password"Default tablespace tablespace_nameTemporary tablespace temp_tablespace_nameAccount unlockModify user:Alter user user_name
Iii. Data Storage1. tablespaceCreate tablespace tablespace_nameLogging datafile 'd: \ ORACLE \ ORADATA \ ORASTUDY \ TEST. ora 'size 5 MDefault storage (initial 10 k next 10 k pctincrease 20)
Alter tablespace tablespace_name default storage (in
them in detail later. Generally, our discussions are based on Relational Models.
2. tablespace and filesRegardless of the relational structure or oo structure, Oracle databases store their data in files. The database structure provides logical ing of data files, allowing separate storage of different types of data. These logical partitions are called tablespaces.
A table space is the logical division of a database. Each database has at least one table space (called a system table space ). To fa
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.