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MySQL deletes data in several cases and whether to free disk space:1, DROP table table_name immediately free disk space, whether it is InnoDB and MyISAM;2. TRUNCATE TABLE table_name immediately frees up disk space, both InnoDB and MyISAM. Truncate table is somewhat similar to the drop table and then creat, except that the CREATE table process is optimized, such as when the table structure file is already th

mysql-uxx-pxx--ssl-ca=/opt/mysql/ssl/ca-cert.pem--s Sl-cert=/opt/mysql/ssl/server-cert.pem--ssl-key=/opt/mysql/ssl/server-key.pem-e \"show slave status\G;\" | Grep-i Master_host "`; [Python]View PlainCopyprint? # get Master host name or IP address Db01= ' echo $db 01tmp | awk ' {print $} ' # Start cleaning up Binlog log information [Python]View PlainCopyprint? SSH $db "Mysql-uxxx-pxx--ssl-ca=/opt/mysql/ssl/ca-cert.pem--ssl-cert=/op T/mysql/ssl/server

space, there is no need to worry about their memory too little. If you use a lot of swap, you might want to consider adding physical memory. This is also the standard for Linux to see if the memory is adequate.In the case of an application server, the general only looks at the second line, +buffers/cache, which is too little memory for the application, and it is time to consider optimizing the program or adding memory.Example 2: Displaying memory usage information as a sumCommand:Free-tOutput:[

available under the simplified BSD license. Just drop it in your project and enjoy!Benchmarks, yay!So, the fun part of creating data structures was writing synthetic benchmarks and seeing how fast yours was versus other Exi Sting ones. For comparison, I used the Boost 1.55 lock-free queue, Intel's TBB 4.3 concurrent_queue , another linked-list based lock-free queue of My own (a na?ve design for reference),

by MMAP can be freed separately. of course, there are other benefits, there are disadvantages, and then specific, interested students can go to see the glibc inside the malloc code. 5, the process calls D=malloc (100K) after the memory space 5;6, after the process calls free (c), C corresponds to the virtual memory and physical memory released together. 7.After the process calls

, when I set its value to 1/2/3, the above situation will be normal error. After this test, we recommend that in the development process, it is best to set the Malloc_check_ to 0, wait until the release, the value is set to 0 increase speed. The following is the GLIBC MALLOC debugging related environment variables or tool description, is a good reference (GO) a) Malloc_check_gnu standard library (GLIBC) Dynamic memory can be debugged through the buil

memory is 16176KB, used memory is 3250004KB, which includes, the kernel (OS) uses +application (X, Oracle, etc) using the +buffers+cached.The third line refers to the application from the point of view, buffers/cached is equal to the availability of the application, because buffer/cached is to improve the performance of the file read, when the application needs to use memory, buffer/cached will be quickly recycled.So from the application's point of view, available memory = System

four.Difference: The used/free of the second line (MEM) differs from the third row (-/+ Buffers/cache) used/free. The difference between the two is that in terms of use,The first line is from the OS point of view, because for the os,buffers/cached are all belong to be used, so his available memory is 16176KB, used memory is 3250004KB, which includes, the kernel (OS) uses +application (X, Oracle, etc) using

. The reference tutorial for Java beginners is very good.Free Download: Think Java7. Data structures and algorithms with object-oriented Design Patterns in JavaThis book is very helpful for learning about the data structure of Java. The author is Bruno R. Preiss. You can read it online, or you can download the source code for the tutorial.Data structures and algorithms with object-oriented Design Patterns in JavaFree online tutorials: Data structures and algorithms with OOD Patterns in JavaOrigi

This is a creation in Article, where the information may have evolved or changed. Translate the original link reprint/reprint please indicate the source English original link published in 2014/06/07 function calls are not free A function call has three steps. Create a new stack frame and record the details of the caller. Save any register content that will be used by the called function to the stack. Computes the address of the called function and exe

= =) { // Close the Dialog true);The KeyCode value of the ESC key is 27, so you only need to find it in the KeyDown event. Once monitored, closes the dialog box and sets the focus back to the previous focus element.SummarizeIt is obvious from this article that creating a dialog box that can be easily accessed by screen readers and keyboard users does not require a lot of extra code. With just a few lines of code, what you bring to the user is no longer an endless frustration, but inc

Kaspersky is free for life !~~ Don't go around looking for keys !~ Haha !~~ Don't forget to mention it! Don't forget to dig for water! The method is simple. First, close Kabbah (right-click the Kabbah symbol in the taskbar and choose to exit ~), Manually delete the following three registries: HKEY_LOCAL_MACHINE/software/kasperskylab/licstorageHKEY_LOCAL_MACHINE/software/Microsoft/cryptography/RNGHKEY_LO

should copy Identity.pub as default. The agent has no identities: When the ssh-agent is running and the ssh-add-l returns ' the agent has no identities ' (i.e no keys are added to the ssh-a Gent), the Ssh-copy-id would still copy the message "The agent has no identities" to the Remote-host ' s Authorized_keys entr Y. Duplicate entry in Authorized_keys: I Wish Ssh-copy-id validates duplicate entry on the Remote-host ' s authorized_keys. If you execute Ssh-copy-id multiple times on the loca

"--entitlements "${built_products_dir}/${wrapper_name}/${project_name}.xcent" "${ built_products_dir}/${wrapper_name}/"FiNote: Before Xcode5.0, figure one, followed by figure II4, if my program debugging good, how can I send someone to use it? The IPA file is normally output from Xcode's organizer, but we do not have a certificate so the output generates an error. We can only do this with a little trick. The code is first born as a release target, and then the output folder of the project is op

Method/StepVerify SSH remote login, not for the two machines without the secret processing, log in, is required to enter the passwordThe local system executes the SSH-KEYGEN-T RSA command, generating the key fileView the generated key file in the appropriate directory, where: Id_rsa is the private key file and Id_rsa.pub is the public key fileThe local machine executes commands such as: ssh-copy-id-i ~/.ssh/id_rsa.pub [email protected], transferring the public key file to the remote machine and

-lv_home 3.2G 70M 2.9G 3%/home/dev/sdd1 1008G 161G 797G 17%/var/cloudTo adjust the/DEV/SDD1, only 1% of the space is reserved:# tune2fs-m 1/DEV/SDD1TUNE2FS 1.41.12 (17-may-2010) Setting reserved blocks percentage to 1% (2684381 blocks)After adjusting to view the freed hard disk space, found that more 838-797=41GB space:# Df-hfilesystem Size used Avail use% mounted on/dev/mapper/vg_cloud22-lv_root 32G 1.1G 30G 4%/tmpfs

| Msg_type | Msg_text |+-----------------------+----------+----------+----------+| David_test.members | Optimize | Status | OK |+-----------------------+----------+----------+----------+1 row in Set (40.02 sec)+--------------------+----------+----------+----------+| Table | Op | Msg_type | Msg_text |+--------------------+----------+----------+----------+| David_test.test_site | Optimize | Status | OK |+--------------------+----------+----------+----------+1 row in Set (40.31 sec)+--------------

Info.plist.NsbluetoothperipheralusagedescriptionAccess BluetoothNscalendarsusagedescriptionVisit calendarNscamerausagedescriptionCameraNsphotolibraryusagedescriptionAlbumNscontactsusagedescriptionContactsNslocationalwaysusagedescriptionAlways access locationNslocationusagedescriptionPositionNslocationwheninuseusagedescriptionAccess location during useNsmicrophoneusagedescriptionMicrophoneNsapplemusicusagedescriptionAccessing the Media LibraryNshealthshareusagedescriptionAccess to health sharing

After the files in Linux are deleted, the space is not released because in the Linux system, deleting files via RM or File Manager will be unlinked from the directory structure of the filesystem (unlink). However, if the file is open (there is a process in use), The process will still be able to read the file, and disk space is always occupied.Workaround:1, first DF-LH check the disk usage status2. Locate the partition where the deleted file is located, eg.opt partition3. View all files that hav

is not necessarily a lock (public key), but if any one lock, the corresponding key (private key) is opened, The server can be controlled by that person. So, as long as you know the root password of the server, and put the root of the public key on the above, you can use the private key corresponding to the public key "open" server, and then log in as root, even if the root password is nowModified!---------------------------------------------------------------------------------------Method II, i