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Summary of the storage experience of the logical Oracle ROWID

Windows2000Version5.1ServicePack1,CPUtype586 Oracle9iEnterpriseEditionRelease9.2.0.4.0-Production WiththePartitioning,OracleLabelSecurity,OLAPandOracleDataMiningoptions JServerRelease9.2.0.4.0-Production Windows2000Version5.1ServicePack1,CPUtype586 Instancename:test4 Redothreadmountedbythisinstance:1 Oracleprocessnumber:9 Windowsthreadid:3828,image:ORACLE.EXE ***2004-12-2300:17:53.361 ***SESSIONID:(8.82)2004-12-2300:17:53.301 Startdumpdatablockstsn:5file#:5

Understanding redo (11) truncate and select redo

by modifying the data dictionary, rather than deleting the data. Truncate reduces HWM, releases extent, and regenerate data_object_id. It is faster than delete because it does not need to delete data at all. redo only records the operation itself and does not have redo records with a large amount of data. Therefore, for the truncate operation, if we know the previous data_object_id and the space is not reused, we can still retrieve the data. Under what circumstances will select generate redo?

thinkphp First day of study

background logic code separation of ideas, disadvantages: efficiency than the first kind of low + third: MVC design, has been used, the advantages: is to force the user input, logic, output phase separation, maintenance cost reduction, but the implementation of low Efficiency. - the thinkphp Framework Introduction *Born in 06, the original name of Fsc,07 was renamed As: thinkphp, a Chinese development framework, the Chinese learning cycle will be r

1.thinkphp Framework Introduction

1.Thinkphp Family was first born in 2006 early, originally named fsc,2007 Year new year's Day renamed thinkphp, Self-developed framework with Chinese documentation and community2.Tinkphp Download: http://www.thinkphp.cn the latest Version of 5.0, currently used more is 3.2.3 version3. File directory:4. DeploymentFirst step: Create a Site DirectoryStep Two: Modify the configuration fileStep three: restart ApacheFourth: Modify the hosts file to bind th

The use of partitioning tools in Linux

information for printing the "ext2/ext3" file systemDUMPE2FS [-BFHIXV] [-O superblock=superblock] [-O blocksize=blocksize] Device-H: View Super Block information (grouping information), partition with group managementFile system detection and RepairOften occurs after the crash or abnormal shutdownMount for file system labeled "Dirty"Fsck:file System CheckFsck-t Fs_typeFsck. Fs_type[Email protected] ~]# fsck.fsck.btrfs fsck.ext2 fsck.ext4 fsck.minix fsck.vfat Fsck.cramfs fsck.ext3

Linux disk and File System Management (2) _ File system detection

File System Detection:File system Detection Tool fsck is required because the hardware or software may also cause the computer to crash or suddenly shut down due to a power supply, which results in a file system error. fsck Command Check and repair a Linux filesystemDetecting and repairing Linux file systemsGrammar:fsck [-LRSAVRTMNP] [-C [FD]] [-t fstype] [filesystem ...] [--] [Fs-specific-options]Fsck.type command:View the file systems supported by fsck[Email protected] test]# fsck[tab][tab]fsc

FSCK Tools--checking and repairing file systems on Linux systems

root filesystem small and compact (which is the correct approach). -R When using-A flag to check all file systems, skip the root filesystem (it may have been mounted as read/write). -T displays the title at startup. -V produces redundant output that contains all commands for the specific file system being executed. FS-specific-Options Fsck does not understand an option that is passed to a particular file system inspector. These options must be--The boot options and parameters will be passed to

Where to download the third party screenshot tool?

where to download the third party screenshot tool? Picpick 1, Picpick Picpick has a full screen, active window, designated areas, fixed areas, hand-painted area functions, support scrolling screen, screen color, support dual display, with whiteboard, screen ruler, rectangular coordinates or polar coordinates display and measurement, with powerful image editing and annotation function. Download Address: Picpick 2, Snipaste Snipaste Snipaste is a simple but powerful

Yum Update encountered dependency error resolution in Linux

package--> Resolve Dependencies CompleteError: Package: libbluray1-0.4.0-6.el7.x86_64 (@atrpms)Required:/usr/sbin/ldconfigDeleting: glibc-2.17-55.el7_0.1.x86_64 (@updates)Not foundUpdate, by: glibc-2.17-55.el7_0.3.x86_64 (Updates)Not foundYou can try to add the--skip-broken option to resolve the problemYou can try to execute: Rpm-va--nofiles--nodigestWill resemble the one shown above, just a few one or two packages, try uninstalling it to see [ROOT@FSC

Data block dump and RDBA conversion

-----------------------------------------------------------------Extent header:: spare1:0 spare2 : 0 #extents: 1 #blocks: 7 last map 0x00000000 #maps:0 offset:4128 highwater:: 0X004062BB ext#: 0 blk#: 1 ext size:7 #blocks in seg. HDR ' s freelists:1 #blocks below:1 mapblk 0x00000000 offset:0 unlocked Map Header:: Next 0x00000000 #extents: 1 obj#: 13 947 flag:0x40000000 Extent Map-----------------------------------------------------------------0x004062ba length:7 NFL = 1, NFB = 1 Typ = 1 NXF = 0

Perspective Gmpls Technology

exchange the data stream as long as it sees the wavelength, time slot or the comparison of the band. Optical fiber is the most obvious and basic switching unit in optical communication networks. Wavelength and optical bands are also a very common switching unit. There is, of course, a time slot switching unit that continues to be the mainstream of optical network hosting services so far. In the optical communication network, the GMPLS is extended to the MPLS tag, so that the label can be labe

Summary of Oracle Transaction knowledge points

time will detect 1 open ITL, check the rollback segment header of the Transaction table discovery status is active, you need to construct 1 CR blocks;Clones the current block, undoing its most recent operation by rolling back the segment header and the rollback block;Buffer status can be viewed via x$bh.state0 Free No valid block image1 Xcur A current mode block, exclusive to this instance2 Scur A current mode block, shared with other instances3 CR A consistent read (stale) block image4 Read bu

DB2 recovering a case of sql0928n

Environment is AIX 6.1,db2 version 9.7.0.7First, see if the DB2 master process existsPs-ef|grep Db2sysIf there is no useDb2startOpen the database backup media as a cold standby data source, CD to the directory where the media is located:Cd/home/db2inst1/backupUse the redirect parameter to change the directory:1.>DB2 restore DB XXX from. Replace existing redirect without rolling forwardSQL1277W A redirected restore operation is being performed. Table space configuration can now is viewed and tabl

Prospect of multi-protocol Switching GMPLS

establishment of a tag exchange channel between all endpoints and the establishment of a request based on requirements. Data Streams of various data types on a link are rarely active, and a service only appears between several nodes, that is, the service is local, you can use this locality to establish a tag exchange channel based on requests to improve network scalability. GMLS establishes a tag exchange channel based on the request.These different label switching channels benefit from the typ

Solution to Ubuntu speaker silence

, separate surrounds (default) 3stack3-stack, shared surrounds Laptop2-channel only (FSC V2060, Samsung M50) Laptop-eapd2-channel with EAPD (ASUS A4.7) Laptop-automute 2-channel with EAPD and HP-automute (Lenovo N100) Ultra2-channel with EAPD (Samsung Ultra tablet PC) Samsung2-channel with EAPD (Samsung R65) Samsung-p502-channel with HP-automute (Samsung P50) There are a lot of models below. Try to select the model corresponding to your model. If it d

Comparison between multi-protocol GMPLS and MPLS

regarded as a virtual representation of the physical structure. Therefore, the label switching channel indicating the low-level synchronous optical network circuit (SONET) must be nested into the high-level synchronous optical network circuit 。 Similarly, a tag exchange channel running between optical switching cable interfaces (FSC) may contain a tag exchange channel running between switching function interfaces (LSC, the tag exchange channel runnin

Windows API read-write binary files

In fact, if you have studied C language, use stdio.h directly.The middle function is the simplest, that is, the use of fopen ("Xxxx.xxx", "RB"); and then call Fread/fwrite; Call Fclose when you close it.If you use CreateFile in the Windows Native API, you do not need to differentiate what binary is not binary, as long as the return value of this function is not invalid_handle_value, you can continue to use Readfile/writefile To read and write, and then use CloseHandle to close. This is directly

Cocos2d-x Study Notes (3) CCNode analysis, cocos2d-xccnode

the zooming coefficient of the X axis virtual void setScaleX (float fScaleX); virtual float getScaleX (); // set/obtain the zooming coefficient of the Y axis virtual void setScaleY (float fScaleY ); virtual float getScaleY (); // sets/gets the zoom coefficient virtual void setScale (float scale); virtual float getScale (); // sets the zoom coefficient virtual void setScale (float fSc AleX, float fScaleY); // sets/gets the node coordinate virtual void

Summary about the deletion of delayed blocks, old snapshots, and consistent reading

cannot find the corresponding block in the DB buffer immediately. The former is over 10% and is not recorded in the list, the latter has been written to the disk. If you read the database buffer again and modify the buffer, too much IO will affect the performance. What is the relationship between snapshot and old snapshot? Premise: This block has been used for other sessions (clean), or the block is being occupied (dirty ), ITL (itl, xid, flag, uda, scn \ f

Is DUAL a real table?

..] D6D042000000001000300020000000000200009[...............] D6D043000003DF200820CFC00070E8400018000[.=..............] D6D0440A41874A90023000100004CA900800C2F[.t....#..L../...] D6D0450002A11370001A000A513B6E300010100[7.*.............] D6D04600014FFFF1F831F9B00001F831F9B0001[................] D6D047000000000000000000000000000000000[................] Repeat503times D6D23F0000000002C00000058010100013F0601[.......,...X..?.] Blockheaderdump:0x00400822 ObjectidonBlock?Y

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