or a transaction operation:
Problematic code:========================================================== ================================Try...
AdoConnection1.BeginTrans;
...
AdoConnection1.CommitTrans;ExceptAdoConnection1.RollbackTrans;End;========================================================== ==============================
Analysis: if an exception occurs in the code "adoconnection1.rollintrans" after "try", it will jump to AdoConnection1.RollbackTrans for execution. However, due to an err
') btime,
(End_time-begin_time) * 24*60*60 ttime,
Undoblks
From v $ undostat
Ii. query and monitor undo Information
View
Function
V $ undostat
Contains statistics on all undo tablespaces,It can be used to monitor and adjust the Undo tablespace. DBAs can use this view to estimate the size of the Undo tablespace,ORACLE uses it to automatically manage undo tablespaces
V $ rollstat
Contains information about the Undo segments of the Undo tablespace.
V
Generally, database users are granted the connect, resource, and DBA roles. Users with these permissions can perform operations conveniently but arbitrarily. It is common to create an object in the users tablespace. I think of a technical method. The procedure is as follows:
Step 1: create a user and handle Permissions
SQL> Conn/As sysdbaConnected.SQL> create user usr_xx identified by usr_xx default tablespace tbs_yy;
User Created.
SQL> grant connect, resource, DBA to usr_xx;
Grant succeeded.
S
in non-proportional (fixed width) fonts. Point transfer to span 120/point = Span
For example, 10 points = 120/10 = 12 angle twip "twip" is a measurement unit equal to 1/20 printer points. There are 1440 tashes in the unit of and inches, which are transmitted to the 567 tashes of a centimeter to twips20 * point = twips
For example, 10 lbs = 20*10 lbs = 200 TBS. Below are some common tables that may be converted.
Inches PICAS points pitch twips (1/6
size is fixed, oracle ignores the setting of the undo_retention parameter. If the undo space is insufficient, oracle may overwrite undo information that has not expired.
For an undo tablespace with the AUTOEXTEND option enabled, the database attempts to honor the minimum retention period specified by UNDO_RETENTION. when space is low, instead of overwriting unexpired undo information, the tablespace auto-extends. if the MAXSIZE clause is specified for an auto-extending undo tablespace, when th
'/u02/database/usbo/oradata/tbs_tmp.dbf' size 10 m autoextend on;
SQL> conn scott/tiger;
-- Create an object tb_tmp based on the new data fileSQL> create table tb_tmp tablespace tbs_tmp as select * from dba_objects;
SQL> col file_name format a60SQL> select file_id, file_name from dba_data_files where tablespace_name = 'tbs _ TMP ';
FILE_ID FILE_NAME----------------------------------------------------------------------6/u02/database/usbo/oradata/tbs_t
SQL _stmts), dbpartitionnum from sysibmadm. snapdb"
-- The number of statements added, deleted, and modified for each transaction
Db2 "select uid_ SQL _stmts, (commit_ SQL _stmts + rollback_ SQL _stmts), dbpartitionnum from sysibmadm. snapdb"
-- Number of rows returned by each transaction
Db2 "select row_selected, (commit_ SQL _effects + rollback_ SQL _effects), dbpartitionnum from sysibmadm. snapdb"
-- Number of rows returned for each transaction
Db2 "select rows_read, (commit_ SQL _cmdts + ro
In a project, if you want to obtain the IP address of the system, many people may think about how easy it is, but it is not as easy as it seems to be in multiple operating systems, the following shows how to obtain the IP address of the system.Java codePackage easyway. tbs. commons;Import java.net. InetAddress;Import java.net. NetworkInterface;Import java.net. SocketException;Import java.net. UnknownHostException;Import java. util. Enumeration;Import
Oracle undo Reading Notes, oracleundo
Two parameters related to undo:
Undo_tablespace
UNDO_MANAGEMENT = auto
After oracle 9i, we recommend that you use undo for automatic management;
Undo_retention
This parameter is used to ensure that the content in the undo rollback segment is not overwritten. However, this parameter must be considered together with the undo size setting (maxsize, unlimit.
Otherwise, it is meaningless.
When the undo tbs size is f
Use JavaScript scripts to determine whether the page is being opened.
1. Determine Based on User-Agent
// Js obtains the User-Agent window. navigator. userAgent if (window. navigator. userAgent. match (/MicroMessenger/I) = "micromessenger") // Php obtains the User-Agent echo $ _ SERVER ['HTTP _ USER_AGENT ']; if (strpos ($ _ SERVER ['HTTP _ USER_AGENT '], 'micromessenger') = true) // open the obtained User-Agent Mozilla/5.0 (Linux; u; Android 5.0.2; zh-cn; MI 2 S Build/LRX22G) AppleWebKit/533.1
-- ====================================
-- Backup and recovery of read-only tablespace
-- ====================================
I. Features of read-only tablespaces
Use read-only tablespace to avoid frequent backup of static data
When alter tablespace tbs read only is used, the data file will execute the Checkpoint Process (write all the contents of the dirty buffer to the disk ),
The current SCN number is marked, and the header of the data file stori
first and then read whether the other is OK. For example, if OK is removed, it is a problematic hard disk! Test another disk! Is to use exclusion to find! If it is a array box, the disk will be displayed! Now, Intel has a tool to show the health status of the hard drive on the current port. This is more intuitive !!!C. After you confirm that the disk is damaged, it will be automatically reorganized and repaired after the same hard disk is replaced. the time consumed is related to the hard disk
Description
Ever the maturing businessman, Farmer John realizes that he must manage his time was tively. he has n jobs conveniently numbered 1 .. N (1
N jobs, the time required for each job, and the deadline to be completed, ask when to start. Input
* Line 1: A single INTEGER: N
* Lines 2. n + 1: line I + 1 contains two space-separated integers: t_ I and s_ I output
* Line 1: the latest time farmer John can start working or-1 If Farmer John cannot finish all the jobs on time.
Question:
The star
micro-op is written in advance, my question is how this one-to-one ing relationship is implemented, because I have not seen the qemu-0.9 version beforeCode So I want to know how Hand coded. In addition, this article also mentions "When qemu first encountersA piece of target code, it translates it to host code ....... ", my question is, how does qemu process objective files on the target platform? For example, how does qemu analyze an elf file, how does it read instructions from it, and how does
Yahoo! Researchers used hadoop to complete the Jim Gray benchmark sorting, which contains many related benchmarks, each of which has its own rules. All sorting benchmarks are determined by measuring the sorting time of different records. Each record is 100 bytes. The first 10 bytes are keys, and the rest are numerical values. Minutesort compares the data size sorted within one minute, and graysort compares the sorting rate (TBS/minute) when sorting la
(0057494ad8732195794a7b32078424f92a5fce41),platform=Windows NT 6.1.7601 SP1 x86_64)"}}[Chromedriver] Chromedriver exited unexpectedly with code null, signal SIGTERM[Chromedriver] Changed state to 'stopped'[Chromedriver] Unable to automate Chrome version because it is too old for this version of Chromedriver.[Chromedriver] Please see 'https://github.com/appium/appium/blob/master/docs/en/advanced-concepts/chromedriver.md'[Chromedriver] Error: session not created exception: Chrome version must be
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