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Long Raw data types is not included from the CREATE TABLE AS syntax. This is documented from the Oracle 7.3 or 8.0 Server SQL Reference Guide AS subquery clause explanation with the CREATE TABLE syntax. The INSERT INTO statement results from the same error see example. Use export/import to workaround this limitation of long raw usage.
SQL create table test2 as select col1 from test1;
SQL alter table test2 add col2 long raw;
You may now export in one table test1 and import in the other table test2.
More and even more we are using locally managed tablespaces. They offer a great deal of benefits, why should we not take advantage of this new feature?
Some thoughts are needed if you decided to make use of Uniform Extent Allocation. With the uniform method, you specify a degree size after you create the tablespace, and all of extents for everyone objects created within that tablespace is going to be that size.
The uniform method also gives an enforcement mechanism, since you can t override the uniform extent sized locally managed tablespaces if you create a schema object like a table or perhaps an index.
The goal should be to allocate the maximum amount of disk space as really needed in addition to being really used. With the uniform extent allocation you are able to calculate and even estimate the volume of extents you would like to allocate. Gaps or unused disk space inside the tablespace really should be avoided.
Lets believe that we make a tablespace while using uniform extent sized 1 MByte and 10 extents. Remember that locally managed tablespaces use another 64 KBytes or perhaps the Header Bitmap:
Note that every calculations are made in KBytes which your chosen extent dimension is the multiple within your defined block size. The following statement creates this locally managed tablespace having a uniform extent dimensions of 1 MByte:
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1024K;
If you happen to be including a STORAGE clause after you create tables or indexes, Oracle will allocate the maximum amount of extents because you indicate to make use of. Table TAB1 will probably be allocated with one extent, table TAB2 too as you need a minimum of 100 KBytes. Table TAB3 will probably be created with two extents. This could be also done by defining an INITIAL worth of 2 MBytes.
SELECT segmentname, segmenttype, blocks, extents
SELECT tablespacename, bytes, blocks
That means from the tablespace UNITEST are nevertheless 1536 blocks available. How many extents are these blocks? This might be calculated by multiplying the quantity of available blocks from the block size and divided from the extent size:
extents could possibly be used to load the whole tablespace.
If you confirm the physical file size used in the tablespace UNITEST you are going to be surprised: Instead on the calculated 10304 KBytes 10551296 Bytes there is an disk file s sized 10555392 Bytes. Oracle allocates another block which may not be useful for object allocation. Some in the Oracle tools such as Tablespace Manger shows the overall number of blocks in accordance with the disk file size. In our example this are 2577 blocks, but usable are simply 2576 blocks minus 64 KBytes for header bitmap.
Each extent dimension is the multiple of one's defined block size.
The usable tablespace dimensions are the multiple of one's estimated quantity of extents.
KBytes for your header bitmap HB for the usable tablespace size.
The physical file size adds one block AB towards the defined tablespace size.
In Oracle8i BLOBs Binary Large Objects may be used instead of LONG RAWs to save binary unformatted data, like documents, images, car stereo. On the brand new BLOB data type many in the former LONG RAW restrictions will not be valid anymore or longer to 4GB is usually stored. This tip shows tips on how to migrate LONG RAW columns to BLOBs.
It may be worth to make a separate tablespace for that LOBs bigger contents to achieve performance. The tables containing LOB columns might be stored combined with other tables within a tablespace called tab within this sample. However the LOB columns referencing their data inside a separate tablespace called btab here.
A new table has to be created made up of the new BLOB column. Even if you'll be able to add a BLOB column with an existing table we can't migrate old LONG RAW data within it. The required SQL function TOLOB can be utilized in SELECT subqueries of INSERT statements only.
id NUMBER10 CONSTRAINT nnnewdocsid NOT NULL,
LOBs normally do not use rollback segments. To maintain read consistency Oracle creates new LOB page versions if a lob changes. PCTVERSION may be the percentage of most used LOB data space that could be occupied by old versions of LOB data pages. As soon as old versions of LOB data pages begin to occupy a lot more than the PCTVERSION quantity of used LOB space, Oracle efforts to reclaim the previous versions and reuse them. In other words, PCTVERSION may be the percent of used LOB data blocks which can be found for versioning old LOB data. The PCTVERSION might be set on the percentage of LOBs which might be occasionally updated. If LOBs are inserted once and afterwards usually read only, 0% works extremely well.
If CACHE is specified Oracle places LOB pages inside buffer cache for faster access. NOCACHE can be employed if you'll find occasionally no writes to stored LOBs and infrequently reads only. CACHE READ will work for busy read operations and infrequent writes.
Set CHUNK to the volume of blocks of LOB data that will likely be accessed at once. This reduces network roundtrip overheads. The INITIAL and NEXT storage parameters has to be greater than CHUNK DBBLOCKSIZE size. Use bigger CHUNKs when possible.
The default setting ENABLE STORAGE IN ROW stores LOBs lower than 4KB inside the table and greater LOBs are automatically moved out on the row. This would be the recommended setting. DISABLE STORAGE IN ROW can be accustomed to store all data outside of the rows. A lot of small LOBs in a table can decrease performance of table operations like full table scans or multi-row accesses.
Consider that CHUNK and ENABLE/DISABLE STORAGE IN ROW can't be altered after table creation.
INSERT INTO newdocs id, bdata
To copy the details is easy. The SQL function TOLOB can be accustomed to convert LONG RAW to BLOB. Its also possible to convert LONG to CLOB as appropriate. The main thing in the whole data migration is always to choose good storage parameter settings especially when a large number and enormous LOBs in space need to be stored.
One choice for secure communication between your Net8 client and server should be to tunnel the communication from the Secure Shell protocol.
Conceptually, it truely does work like this. First, you install an SSH client about the local machine in places you run your Net8 client. You makes use of the SSH client to find out an SSH connection for the remote host the spot that the Net8 server is running. You also utilize SSH client to determine a listen using a local port for Net8 requests.
Heres the cool part: after you fire up your Net8 client, it connects for the Net8 port on localhost - your machine - rather then connecting to port 143 on the remote server machine.
The SSH client then forwards everything it receives within the local Net8 port with the SSH session, or tunnel, towards the remote SSH daemon, which then forwards the data for the Net8 port within the remote host.
How does the SSH daemon about the receiving end follow simple proven steps with all this Net8 information coming in internet marketing? Well, the details is part in the port-forwarding arrangement you gave the daemon if you first thrilled the SSH session. For example, youd invoke SSH from the unix client machine such as this
Tfhe command have to be invoked as root because root privilege is necessary to set up port forwarding. The -f option tells SSH to run inside background after port forwarding may be established. -L localport:remotehost:remoteport specifies how the given port about the local client host is usually to be forwarded towards the given host and port within the remote side. In our example, we use port 5555 within the client and port 1521 within the database server 192.168.121. 32
The server port have to be whichever port listens for Net8 requests 1521 of many systems. Depending within the SSH client, youll either be prompted for the password to log in towards the SSHD 194.75.132.34 server when issuing the tunneling command, or youll need to initiate a login manually to ascertain the session, In all cases, youll have to work with SSH to log in towards the remote host before you are able to use it to launder your connection. The entire Net8 port-forwarding scenario is shown from the next figure.
We start with using lsof list open files, a plan that informs you which open files and network connections participate in which processes. to test for software listening at local TCP port 5555. There is none. We confirm this by looking to telnet to localhost at port 555 with no success.
At here, were sure theres no activity, say for example a listen or perhaps an open connection, on port 555 on our local machine. That port is okay make use of. Next, we put in place the port forwarding by issuing an SSH command. Remember that you ought to be root to setup port forwarding:
The tail - f/dev/null we tacked around the end with the SSH command is simply low-overhead command to hold the session open. We didnt want to help keep an actual shell session open and running within the background once we didnt require it, and we used the tail command instead. You can verify with ps - ef, that this command is actually running from the background and you also now have a lasting Net8 connection through two firewalls - - cool isnt it?
Next you must setup your configuration file, then look into the connection with tnsping and lastly connect with sqlplus.
Starting with Release 7.1 of Oracle, users also have access to an element called an inline view. An inline view is really a view inside a query. Using this feature, you'll be able to easily accomplish your task.
Every row within the report need to have access to the complete sum of sal. You can simply divide sum sal by that total, and youll possess a number to display the percentage from the total.
column percentage format 99.9
select deptno, sumsal, sumsal/totsal100 PERCENTAGE
from emp, select sumsal totsal from emp
With Oracle8i Release 2 8.1.6 far better, you'll be able to calculate percentages by using the brand new analytic functions at the same time. The query utilising an analytic function might look this way:
column percentage format 99.9
select deptno, sumsal, ratiotoreportsumsal over100 PERCENTAGE
The query produces the identical answer nevertheless it does so better, as it does not should make two passes over the information to arrive at a better solution. Because the analytic functions are built-in, queries which use them will find the response more rapidly as opposed to pure SQL-based approach.
It is often difficult to list all privileges and roles used on a specific user in a select, since a privilege could be assigned to a job, which often can be sent to another role, which in turn could be assigned to a new role, which could be granted an individual. The following view lists all of one's roles, all from the roles granted to prospects roles, and so forth:
START WITH grantee uid OR grantee 1 sa, u2
GRANT SELECT ON userrolehierarchy TO PUBLIC;
That view is based around the existing data dictionary view, if you produce the new view as SYS, it is going to show the currently logged-in users their roles and all with the roles granted to prospects roles, and so forth. Youll find this view to be very fast.
To get all within your table privileges, you must do this:
SELECT DISTINCT privilege, owner, tablename
WHERE grantee IN SELECT FROM userrolehierarchy;
And for getting all of the system privileges, you must do this:
where grantee in decide upon userrolehierarchy;
During a migration it usually is important, that nobody can connect to your database. You may have two opportunity to achieve this
An exclusive table lock would be the most restrictive mode of table lock, allowing the transaction to hold lock exclusive write access on the table. An exclusive table lock is acquired for any table as follows:
SQL GRANT ALL ON emp TO PUBLIC;
Only one transaction can acquire an exclusive table lock for the table. An exclusive table lock permits other transactions and then query the table.
An exclusive table lock held using a transaction prohibits other transactions from performing almost any DML statement or placing almost any lock within the table.
Oracle releases all locks acquired from the statements inside of a transaction whenever you either commit or roll back the transaction. Oracle also releases locks acquired after the savepoint when rolling back towards the savepoint. However, only transactions not waiting for that previously locked resources can buy locks for the now available resources. Waiting transactions continue to wait until following the original transaction commits or rolls back completely.
You may utilize RESTRICTED SESSION system privilege to modify the database in single user mode for migrations.
Qllows only users with RESTRICTED SESSION system privilege to go online to Oracle. Existing sessions are certainly not terminated.
reverses the effect in the ENABLE RESTRICTED SESSION clause, allowing all users with CREATE SESSION system privilege to go online to Oracle. This will be the default.
You can make use of this clause no matter whether your instance has got the database dismounted or mounted, open or closed.
In an initial step prior to migration, you shutdown the database an start it again to be sure that most users are disconnected. Now revoke the RESTRICTED SESSION system privilege from most users, it privilege is commonly not used.
svrmgr SHUTDOWN IMMEDIATE;
svrmgr SPOOL revokerestrictedsession;
svrmgr ;
svrmgr ALTER SYSTEM ENABLE RESTRICTED SESSION;
As user SYS you'll be able to now perform the migration. If an ordinary user attempts to connect, he's going to get these error messge:
After the migration not to to forget, to disable the RESTRICTED SESSION system privilege
svrmgr ALTER SYSTEM DISABLE RESTRICTED SESSION;
This tip comes from the Oracle Magazine, it shows the usage on the DBMSOBFUSCATIONTOOLKIT.
The DBMSOBFUSCATIONTOOLKIT could be the DES encryption package. This package shipped with Oracle8i Release 2 and later on. It provides first-time field-level encryption from the database. The trick to presenting this package is always to make sure everything is usually a multiple of eight. Both the key and also the input data have to have a length divisible by eight the key have to be exactly 8 bytes long.
lstring VARCHAR225: hello world;
divisible by eight the key should be exactly 8 bytes long.
ldata: RPADlstring, TRUNCLENGTHlstring/818, CHR0;
LINElstring before encrypt: lstring;
DBMSOBFUSCATIONTOOLKIT. DESENCRYPT
encryptedstring lstring;
LINElstring ENCRYPTED: lstring;
DBMSOBFUSCATIONTOOLKIT. DESDECRYPT
LINElstring DECRYPT: LDATA;
PL/SQL procedure successfully completed.
You must protect and preserve your magickey 8 bytes of knowledge that is employed to encrypt/decrypt the information. If it becomes compromised, important computer data is vulnerable.
The OPEN FOR clause allows to develop dynamic SQL with variable table-, or column names that return multirow result sets. Lets keep an eye on at OPEN FOR and multirow queries which has a concrete example. Create the subsequent tables:
SQL create table emp10 as choose between emp where deptno 10;
SQL create table emp20 as choose between emp where deptno 20;
SQL create table emp30 as choose from emp where deptno 30;
TYPE refCur IS REF CURSOR;
EXIT WHEN empcv%NOTFOUND;
The first step in a very dynamic multirow query is usually to define the cursor variable that could point on the result set inside the System Global Area. We declare the cursor variable as an example of a REF CURSOR type, and then we must take into account the question of whether to create it strong or weak. A REF CURSOR is strong when it is strongly typed, this means the TYPE statement has a RETURN clause defining what structure is allowable volume of items and datatypes for data fetched by using a cursor variable according to this TYPE.
With dynamic SQL, however, you happen to be not allowed to utilize strong REF CURSORs. At compile time, the query associated with all the REF CURSOR is simply string, therefore the PL/SQL engine cannot validate which the querys SELECT list is consistent while using record structure within the REF CURSORs RETURN clause.
Once that's done, we declare a record we can use to retrieve individual rows from any in the three tables the 3 tables have exactly the same structure, and we can %ROWTYPE the record against any with the tables.
We must use dynamic SQL, since we're also constructing the name with the table each and every time we run this system. But dynamic SQL doesnt require any more within the way of special code than we have just described. We can make use of the familiar explicit-cursor syntax unchanged for my cursor-variable-based code, because following lines demonstrate:
This tip originates from Anirban Das, a Senior IA from Vernon Hills, IL. We have improved the SQL statement in most points, so WHERE clauses will likely be correctly executed.
In SQLPlus, it is often tricky to read the results of your SELECT FROM table statement ever since the output could wrap across multiple lines. For example, the regular output of SELECT FROM dbausers can be:
The results aren't clearly readable.
Implementing this SQL script, the output can be:
This formats the final results to 1 row per screen together with the length of information in square braces. It also allows optional WHERE clause and ORDER BY.
Sometimes, the DBA has to log in to a users account for making a change, like to grant a privilege using a users table to an alternative user, but, might not exactly know what users password is, or, may need to generate changes to some set of users from your script, but, doesnt would like to include their passwords from the script itself. Oracle has an undocumented identified by values clause within the alter user command that can be used by this purpose. Since the dbausers table has the encoded password per user, this value can be familiar with generate an alter user command to reset a gamers password back in its original value. Then, from user system or some other DBA user, you may alter a persons password into a known value including whatever, log in to the users account using connect userid/whatever, increase the risk for changes which are needed, connect back on the system account, and run the generated alter user command that will put the original password back.
The following SQL generates your password strength change script to line all users to some known password whatever, and, another script setting all users back in their original passwords. This will be used as part of another script to come up with the password change scripts, run, sign in and make changes which might be needed, and immediately run to get the passwords back. Note how the users wont be able to signing in during that time, since their passwords aren't valid while you're running the script.
select alter user username identified by whatever;
alter user SYS identified by whatever;
alter user SYSTEM identified by whatever;
alter user DES identified by whatever;
alter user ELAN identified by whatever;
alter user SYS identified by values 5638228DAF52805F;
alter user SYSTEM identified by values D4DF7931AB130E37;
alter user DES identified by values ABFEC5AC2274E54D;
alter user ELAN identified by values B53CE8493EC6FB92;
Using the package UTLHTTP, it is possible to access any HTML page from SQL
JDBC can be a set of classes and interfaces printed in Java permitting other Java programs for you SQL statements into a relational database management system.
JDBC KPRB driver default connection for Java Stored Procedures and Database JSPs.
Oracles JDBC Thin driver uses Java sockets to get in touch directly to Oracle. It provides its TCP/IP version of Oracles Net8 SQLNet protocol. Because it is 100% Java, this driver is platform independent and will also run from the Web Browser applets.
Oracles JDBC OCI drivers uses Oracle OCI Oracle Call Interface to have interaction with an Oracle database. You must work with a JDBC OCI driver appropriate for a Oracle client installation. The OCI driver works through SQLNet or Net8.
JDBC OCI7 works having an Oracle7 client.
JDBC OCI8 works having an Oracle8 client.
Either of such client versions can access Oracle7 or Oracle8 servers.
The JDBC OCI drivers permit you to call the OCI straight from Java, thereby providing an increased degree of compatibility having a specific Version of Oracle. Because they use native methods, they can be platform specific.
Oracles JDBC KBPR driver is mainly employed for writing Java stored procedures, triggers and database JSPs. It uses the default/current database session and therefore requires no additional database username, password or URL.
All three drivers support exactly the same syntax and APIs. Oracle needs three drivers to compliment different deployment options. Looking at source code, they're going to only differ inside the way you connect to your database. Remember, you must make use of a JDBC version that the version of one's Java Development Kit.
How can you connect together with the JDBC Thin Driver?
The the JDBC thin driver affords the only way gain access to Oracle from your Web applets. It is smaller and faster compared to OCI drivers, and doesnt need a pre-installed version on the JDBC drivers.
machine:port:SID, userid, password
Statement stmt ;
select BANNER from SYS.VVERSION
1;//Print col 1
How can you connect with all the JDBC OCI Driver?
One have to have Net8 SQLNet installed and dealing before attempting to utilize one from the OCI drivers.
or oci7 Service, userid, password
Statement stmt ;
select BANNER from SYS.VVERSION
1;//Print col 1
How do you connect while using JDBC KPRB Driver?
One can acquire a handle for the default or current connection KPRB driver by calling the technique. Please note you don't need to specify a database URL, username or password as you're already connected to your database session. Remember to not close the default connection. Closing the default connection might throw very in future releases of Oracle.
Statement stmt ;
select BANNER from SYS.VVERSION
1;//Print col 1
Dead database connections may be detected and killed by SQLNet in case you specify the TIMEn parameter with your file usually in TNSADMIN. This parameter will instruct SQLNet to send out a probe from the network towards the client every n minutes, if your client doesnt respond, it will probably be killed.
NOTE: This parameter is just useful around the database server side, specifying it on the client workstation should have no effect.
You are listed multiple address entries for the single connection alias from the file. This means that you'll be able to connect to some database, regardless of whether some kind of physical failover occurred. Look on the following example:
Suppose Host1 is down, then every new NET8 connection using service ORA1 will automatically login to Host2. However, there exists one restriction, the SID must be exactly the same on both machines. This feature offers guaranteed login for application servers and to the Oracle Parallel Server.
Where to make use of Stored Outlines?
The SQL statements in a very hybrid system have to have an execution plan that's appropriately tailored to the type of system configuration you're using. When running the statements in the day inside the OLTP configuration they need to work with a different execution plan compared to they would use when running at night inside the DSS configuration. This may be achieved by creating two different stored outlines per SQL statement. The outlines are classified by categories. You can name one category OLTP as well as the other DSS. Each category has the different execution paths.
How to produce the Stored Outline?
To ensure that precisely the same tuning execution plan is used each time a particular totally recompiled, you must develop a stored outline for this. The stored outline is created with all the CREATE OUTLINE command. When creating anyone stored outline to your SQL statement with all the CREATE OUTLINE command allowing the outline an identity which is later employed to identify which outline to make use of during the statements execution.
FROM SELECT empno, ename, hiredate
How to utilize Stored Outlines?
The statement inside the stored outline must match the text in the SQL statement being executed. This is completed by using the strategy for comparing cursors inside the shared pool.
Stored outlines count on hints used because of the optimizer because of its execution plans. Stored outlines utilize the cost-based optimizer. Their query text must match just the text on the stored outline SQL statement. The USESTOREDOUTLINES parameter could be set for the instance or session levels, but will probably be of no use in the event the stored outline hasn't yet been created. The parameter identifies a stored outline for use when executing a SQL statement. If the parameter is scheduled to TRUE, DEFAULT category outlines are being used. If the parameter is set to some category name, that categories outlines are being used. This parameter is set while using the ALTER SESSION or ALTER SYSTEM command. The ALTER OUTLINE SQL command can be utilized to change the class of an outline, rename a plan, or rebuild a plan.
ALTER SESSION SET USESTOREDOUTLINES TRUE;
Where can I discover the created Stored Outlines?
All stored outlines are stored inside OUTLN schema and might be transferred easily while using the Export/Import utility. The OUTLN schema is automatically created using the database.
The OL OUTLN schema table has the outline name, statement text, category, along with the creation date. The OLHINTS OUTLN schema table provides the hints with the outlines inside OL table. This information can be viewed from the DBAOUTLINES and DBAOUTLINEHINTS data dictionary views.
SELECT name, used FROM USEROUTLINES;
Suppose you intend to retrieve and sort information about the 4 recently hired employees within a very efficient way. This could be achieved employing an inline view joined with ORDER BY and ROWNUM.
An in-line view, which is a characteristic of a Top-N SQL query, can be a subquery. This type of subquery differs from your regular subquery by containing an ORDER BY clause that is not allowed in the regular subquery. The ROWNUM condition, which can be an enhanced sorting mechanism, can be used inside outer query to accomplish the Top-N SQL query.
We must retrieve and sort information for the 4 lately hired employees through the following list marked in blue color.
The first approach is always to used the next query, which doesn't select the Top-4 rows!
SELECT empno, ename, hiredate
The solution is always to use an inline view through an ORDER BY as well as a ROWNUM condition, inside outer query to accomplish the Top-N SQL query.
FROM SELECT empno, ename, hiredate
The aim of this query is usually to retrieve and sort information for the 4 not too long ago hired employees. This is often a Top-N SQL query which can be more efficient than a typical query because Oracle stores at most only 5 rows as your data is retrieved in the table avoiding sorting all in the rows from the table at a time. The WHERE clause contains ROWNUM 5 which prevents sorting on greater than 5 rows in the past - - cool isnt it?
Internet portals are now implementing document management systems as part in the offered services for their portal. We have been inspired to review Oracle Internet File System iFS as a way to enable iFS for that portal. This article is founded on iFS version 1.0.8.3.
iFS is, since it's name suggests, personal files system for your internet. It allows users to keep content with a central location, through different interfaces such as a web browser, the Microsoft Windows Explorer or perhaps an ftp client. All content is kept in an Oracle 8i Release 2-3 database, completely transparent for your end user.
The objects stored into iFS could possibly get organised in a virtual folder structure and protected by access control lists ACL which allow fine grained access control. Versioning on the content is also supported.
Using Oracle interMedia optional you possibly can do full text searches with the content trapped in iFS. For example, one search will allow to find all electronic mails, Microsoft Word documents and Microsoft Excel Spreadsheets which contain the keyword Akadia.
Protocol servers are utilized to interact with iFS. You can hook up to them using standard clients, for example Eudora email or even the Microsoft Windows Explorer; iFS clients which get shipped together with the product, including the web interface; or perhaps a custom written client.
The SMTP protocol server allows to work with iFS to provide emails.
They will get saved in iFS.
Through the IMAP protocol server, you possibly can connect any email client that understands IMAP to iFS. The emails are stored centrally inside the database.
Using the HTTP protocol server, it is possible to access iFS using your browser. The standard web server that gets shipped with iFS is Suns Java Web Server. iFS is certified with JRun from Allaire, this allows to perform it with a lot of other web servers like Apache or Netscape.
The FTP protocol server is an additional way to save or retrieve files from iFS.
Using SMB, an iFS mount point might get mapped being a network drive in Microsoft Windows Explorer, services or products other network share. This allows to utilize iFS just like a normal disk drive in Microsoft Windows, programs might get run directly off iFS.
iFS could possibly get customised in various ways. The following describe the points of access.
Whenever content articles are stored into iFS, the presence of an appropriate parser is checked. If there is certainly one, the submissions are not just saved in its binary format, even so the parser is invoked. A parser could, for instance, extract some metadata out from the content and store it separately. An XML parser gets shipped while using product. Using it, objects like users or groups could possibly get created automatically when uploading a file which has its description.
A renderer formats the output. Using a renderer, it's possible to reconstruct data in its original format that has been parsed when stored into iFS or allow it to be look very different. Renderers might be seen because the opposite of the parser.
Agents are server side Java programs utilized to automate an action. They can react on any event within iFS. For example, a project manager could easily get emailed whenever certainly one of his staff updates the timesheet. Agents may be triggered time-based, event-based or both.
With Overrides, you'll be able to re-define the functionality of iFS. This is rather complex and dangerous.
The iFS document hierarchy will not likely fit all application needs. Using custom classes, the hierarchy might get extended. Custom attributes could possibly get added to existing document classes using XML.
Custom Java Server Pages JSP might get written and registered to serve a particular document type display its contents, or you'll be able to write a custom application using JSPs.
The iFS Java API can get utilized to write custom applications as well as to enhance, change or customise the behaviour from the components described above. A custom application may be the mix of several or all strategies to customise iFS as described above.
iFS is rather resource intensive. The requirements for both software and hardware are described below. Oracle recommends to setup a two-tier configuration having a database server as well as an application server. iFS is obtainable on Sun Solaris Version 2.6 with patch 107733 or newer and Microsoft Windows NT 4.0 from the time from the writing want to know ,. The required database release is Oracle8i, Release 2 8.1.6, it takes the JDBC:OCI Driver for Java 1.1 to hook up to it. For a two-tier configuration, Oracle Administrator Client is necessary, too.
For the evaluation, the entire software has become installed and configured for the offices of Akadia AG. The version used is 1.0.8.3 on Sun Solaris. Due to limited system availability, the evaluation was carried out within a single tier environment. Both the database along with the application server was installed on exactly the same machine. Both the CPU and memory minimum requirements are not met.
First coming from all, a whole new database while using the NLS character set US7ACII of version 8.1.6 had to have created. The installation of JServer important for interMedia was very tedious, since the memory requirements are really high. After installing interMedia, iFS 1.0.8.0 along with the patchset 1.0.8.3 was installed. This is really a very easy as well as simple task.
iFS is configured by using a graphical configuration assistant or by editing the written text configuration files. Only minimal configuration needs to get iFS running.
The HTTP protocol server plus the shipped web client are already tested extensively. The application is incredibly robust and is useful even with large files realize that only the Sun Java Web Server was tested - it will not allow for scalability. A 20MB upload lasted approximately 2 minutes via LAN, database not tuned. The FTP protocol server also worked without problems, but had not been tested extensively. Other interfaces were out in the scope of those tests.
One in the most powerful SQL features is usually unknown - CASE Expressions in SQL Queries. An expression is often a combination of more than one values, operators, and SQL functions that evaluate with a value. An expression generally assumes the datatype of the company's components.
CASE expressions enable you to use ELSE logic in SQL statements while not having to invoke procedures. The syntax is:
Oracle searches for your first THEN pair for the purpose condition is valid.
If Oracle finds this type of pair, then this result in the CASE expression is expr1.
If Oracle will not find this kind of pair,
If an ELSE clause is specified, the result with the CASE expression is expr2.
If no ELSE clause is specified, the result in the CASE expression in null.
At least one occurrence of expr1 or expr2 need to be non-null.
The maximum quantity of arguments in the CASE expression is 255, each THEN pair counts as two arguments. To avoid exceeding the limit of 128 choices, you'll be able to nest CASE expressions. That is expr1 can itself be described as a CASE expression.
The following statement finds the normal salary coming from all employees from the EMP table. If an employees salary is under 2000, the CASE expression uses 2000 instead.
In it, we employ a subquery within the CASE expression block. If the subquery finds an entry the CASE expression evaluates to just one, else to 0 and that is stored in userstate.
We think, that such constructs might be very powerful - without to programming PL/SQL.
If you have to create an index with a large and busy table which cannot suffer any downtime, then you may build this index without interrupting the provision of this table.
will produce the index without interrupting the availability in the table.
Note, that NO downtime has experience when rebuilding an index online. All DML operations may continue the whole time. This operation conditions partitioned, nonpartitioned, and index-organized tables with B-tree indexes.
Locks are briefly placed for the table over the prepare phase to set entries within the data dictionary and to make the index structure. Rebuilding an index online requires double the amount space on the current table is offline briefly in the prepare and merge phases. Bitmap, cluster, and secondary indexes that happen to be on index-organized tables may not rebuilt.
When you employ an application very often select rows depending on an expression, then this function based index an index on the function may help avoid full table scans. A function-based index will depend on expressions. Expressions can be arithmetic expressions, built-ins, or another user-defined expressions.
Without a function based index, you will see, that oracle performs an entire table scan.
SQL ALTER SESSION SET QUERYREWRITEENABLED TRUE;
SQL ALTER SESSION SET QUERYREWRITEINTEGRITY TRUSTED;
Check, that this function based index is used
SQL set autotrace on explain;
We use a credit application that deletes data with records over 20MB in the fact table.
This process currently takes nearly 2-3 hours everytime it runs. Is there a way we can speed this up? Note that 1 1 is of fixed length and a couple of 2 is of varying length and mixed case. The character when in front of 1 1 is.
Lets the 1 is following your first plus the 2 is following the second, up on the third. Then I would recommend a function-based index an index using a function a capability added Oracle8i. You can make an index on some function from the lastmodifiedby column that may allow you to locate all on the rows you intend to delete through index as opposed for the full scan which is occurring now. The index you wish to create would make form:
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