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8 8 600 8 9 608 8 ...... 11 624 8 12 632 8 13 640 8 14 1800 8 15 1808 8 16 768 128 17 896 128 18 1024 128 19 1152 128 20 1280 128 21 1408 128 56 7040 128 57 7168 128 58 rowsselected Dump data block information: Select object_id, Dbms_rowid.rowid_relative_fno (rowid) file #, Dbms_rowid.rowid_block_number (rowid) block # From ts_test Where rownum: Dump: # Alter systemdumpdatafile3blockmax 1 blockmin 6; Selectvaluefrom v $ diag_info; [Oracle @ felix ~]

tablespaces and you want to direct the database instance to use a particle undo tablespace.Undo_retention the undo_retention parameter is ignored for a fixed size undo tablespace. The database may overwrite unexpired undo information when tablespace space becomes low.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 tablespac

: permsize to the same size as-XX: maxpermsize.Almost every time eclipse gets stuck, it is caused by insufficient non-heap memory. The maximum and minimum values are adjusted to the same value because myeclipse is not allowed to change the memory size frequently.Note: XX: The sum of maxpermsize and xmx cannot exceed the memory size of your computer!Content in eclipse. ini in myeclipse7.0:----------------------------------------------------------------------StartupPlugins/org. Eclipse. Equinox. l

, 'yyyymm'),-1), 'yyyymm'), lag (incomes) over (order by months), 0) as prev_months, decode (lead (months) over (order by months), to_char (add_months (to_date (Months, 'yyyymm'), 1), 'yyyymm'), lead (incomes) over (order by months), 0) as next_months from (select months, sum (income) as incomes from a group by months) aa) aaagroup by months; Months max (incomes) max (prev_months) max (next_months) ---------- ------------ ---------------- -------------- 200801 4600 7500200802 7500 4600 400020080

Spark is especially suitable for multiple operations on specific data, such as mem-only and MEM disk. Mem-only: high efficiency, but high memory usage, high cost; mem Disk: After the memory is used up, it will automatically migrate to the disk, solving the problem of insufficient memory, it brings about the consumption of Data replacement. Common spark tuning workers include nman, jmeter, and jprofile. The following is an example of spark tuning: 1. Scenario: precise customer base Optimize the

name of GSM is: Global System for Mobile Communications. The Chinese language is the global mobile communication system, also known as "global communication". It is a European mobile communication technology standard and the second generation of mobile communication technology, the development goal is to allow users to use a mobile phone network standard across the world, so that users can use a mobile phone all over the world. Currently, China Mobile and China Unicom each have a GSM network, w

Tags: WAF configuration Digital China dcfw-1800-waf Web Application Security Gateway (WAF) is designed to address WEB Website security issues, and can identify and protect multiple Web Application Layer attacks in real time, for example, SQL injection, XSS, and illegal directory traversal. WAF devices are generally deployed at the front-end of web servers and are deployed with external firewalls. All traffic destined for the internal network must go t

cost. 　　Figure 1 system diagram　1.1 Introduction to The TC35I Module Currently, common GSM modules in China include waecome's wmo2, Ericsson's dm10/dm20 series, ZTE's zxgm18 series, and Siemens's TC35i. Among them, Siemens TC35i series modules are cost-effective and have domestic radio device access licenses. This design selects TC35I from Siemens. TC35I is an industrial GSM module that supports short messages in Chinese. It works in the egsm900 and GSM 180