Oracle

Take advantage of the system global area SGA:The SGA is the heart of the Oracle database. The user's process sends transactions to this memory area and reads the hit data here as a cache for acceleration purposes. The correct SGA size is critical to

when you add a record, HWM slowly moves up, but when you delete a record, HWM does not move down. Therefore, deleting large amounts of data with the delete from command can cause performance problems caused by HWM. The most straightforward way to

Byte[] Xx=encoding.default.getbytes ("12121232");Insert DatabaseString sqlstr = "Update Sys_tab t set T.big_logo =:big_logo,t.small_logo=:small_logo where Id=:id";Oracleparameter[] ParameterValue = {New OracleParameter (": Big_logo", Oracletype.blob)

/** * Value by page number (starting from Current_page page, page_size per page) * @param key * @param params * @param current_page * @param page_size * @retur n */public pagination getpaginationbypage (String key, Object params,int

The Oracle garbled problem is usually caused by inconsistencies in the Oracle character set settings and operating system character set settings, which have to mention two operating system environment variables, LANG and Nls_langLang is a set of

Stored procedures within Oracle are returned by a cursor to the result setDataTable dt =NewDataTable (); Oracleparameter[] Paras=Neworacleparameter[5]; paras[0] =NewOracleParameter ("P_starttime", Oracletype.char); paras[0]. Value =StartTime; paras[1

1 Creating a Stored procedureCreate or replace procedure Job_proc isBeginInsert into YY (Yid) values (sysdate);End2 Create JobDECLAREJOB Binary_integer; --Task IDV_begin DATE; --Start timeV_interval VARCHAR2 (50); --Time

Oracle.ManagedDataAccess.dllEven for 64-bit systems, register a 32-bit version.#if INTERACTIVE#[email protected] "C:\oracle\odp.net\managed\common\Oracle.ManagedDataAccess.dll"#endifOpen Oracle.ManagedDataAccess.ClientOpen

Select Sys_guid () from dual;-->78ae331adb2b4ce7ab598b1317b39d58But the function has the following problem: 1 . The return type is raw 2 . No- (dash) delimiter 3 . Capitalization of letters returnedTo make the resulting UUID conform to the RFC

Create a temporary table spaceCREATE Temporary 'C:\oracle\product\10.1.0\oradata\orcl\test_temp01.dbf'on NEXT 32M MAXSIZE 2048MEXTENT MANAGEMENT LOCAL;Create a user table spaceCREATE'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\TEST_DATA01. DBF'onNEXT 3

If Oracle is a later version of 11g, the default created instance uses the automatic Memory Management (AMM) feature, which is incompatible with hugepage.You need to disable AMM before you set up hugepage. Set the initialization parameters

Use of the Oracle 10g Wmsys.wm_concat Row-and-column conversion function:First let's take a look at this magical function wm_concat (column name), which separates the column values by the "," number, and displays them as a line, and then the example

Table information:1 SELECTTabcols.column_name as"Field",2Tabcols.data_type|| '(' ||Tabcols.data_length|| ')' as"Type",3Cons.constraint_type as"Key",4Tabcols.nullable as"Null",5Colcomments.comments as"Comment"6 fromUser_tab_cols Tabcols7 Inner

When doing the SQL tuning, sometimes need to add an index, test the performance improvement has no help group, if this table is very large, build index will be very troublesome, this scene virtual index will be the debut. Here's an experiment:Sql>

An error occurred while inserting a datagram string into the CLOB attribute of the Oracle database. Insert an article (1000 ~ 2000. Stream processing is not used on the Internet. This is like a Bug. You only need to extend the inserted data to

How does Oraclecloudcontrol12c modify the sysman password? Oracle Cloud Control 12c was deployed on a virtual machine a few days ago, and the login password was forgotten. The main reason is that Oracle-related Software provides stronger security

How to update a patch (RollingPatch) in the OracleRAC Environment) The Oracle RAC database environment has many similarities and differences with the single-instance database environment. You can use opatch to update database patches. However,

From ORA-27300, ORA-27301 to ORA-00064Recently, due to the increase in the number of sessions, you need to adjust the session, that is, to adjust the process parameter. Look at is a relatively simple problem, but encountered a ORA-27300, ORA-27301.

Application of Oracle virtual Index When performing SQL optimization, you may need to add an index to test whether it can help improve the performance. If the table is very large at this time, it will be very troublesome to create an index, in this

Oracle11Gdirectpathread is very beautiful and hurtful.Direct path read In 11g, full table scan may use direct path read to bypass the buffer cache. Such full table scan is physical read. In 10 Gbit/s, it is read through gc buffer, so there is no