Tom Kyte

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These are the most recently asked questions on Ask Tom
Updated: 1 day 4 hours ago

Nightly process slowing down.

Thu, 2019-11-21 11:50
Hi. We have a process that runs every night that is beginning to slow down and we need some help to find the resources to analyse the problem. In our setup, unfortunately both transaction schemas and warehousing (statistics) schemas are kept on...
Categories: DBA Blogs

Golden Signals for performance

Thu, 2019-11-21 11:50
Hello Tom I am a member of an site reliability team (SRE) and we are trying to develop SRE "golden signals" for an Oracle 11g/12c database. These signal are: 1) Throughput 2) Latency 3) Response Time 4) Error rate (not sure about this one...
Categories: DBA Blogs

Difference between DBRM and IORM

Thu, 2019-11-21 11:50
Dear Sir, Please help me to know below points. 1)difference between DBRM and IORM? 2)difference between ACFS,ADVM and DBFS? Thanks Pradeep
Categories: DBA Blogs

SQL*Loader-503 in 19c for UNC names

Thu, 2019-11-21 11:50
Hi TOM, next Month we are migrating from Oracle 12.1.0.2 to Oracle 19, so I installed the new Oracle Client 19c on my PC. Using SQLLDR with (all in one line) sqlldr userid=user/passwd@server control=\\server\share$\folder\controlfile.ini ...
Categories: DBA Blogs

future of dba

Thu, 2019-11-21 11:50
Dear, I am Core Oracle DBA. I do not have experience in RAC,Golden Gate. Sometimes I worried about future of oracle dba in upcoming years in India for all industry like medium and large company. Can you give some recommendation or new technology n...
Categories: DBA Blogs

questions about sampling

Thu, 2019-11-21 11:50
<b>a. how does sampling work internally ?</b> meaning: how is it determined by Oracle which blocks are read by a sample-query and which not ? <code>create table t as select level i, rpad('a', 1000, 'a') s from dual connect by level <= 1e5; cre...
Categories: DBA Blogs

Local temporary tablespace

Thu, 2019-11-21 11:50
Since Oracle 12.2, Oracle has introduced a new feature of local temporary tablespace. The documentation does not provide any information on the pros and cons of this new feature. Can you please provide some information on why this feature was introdu...
Categories: DBA Blogs

Joining two tables with time range

Mon, 2019-11-11 11:49
Dear AskTom-Team! I wonder whether it is possible to join two tables that have time ranges. E.g a table 'firmname' holds the name of a firm with two columns from_year and to_year that define the years the name is valid. Table 'address' holds the a...
Categories: DBA Blogs

TDE Encryption of local Oracle databases. KEK hosted on cloud service?

Mon, 2019-11-11 11:49
Hi, We want to encrypt some on-premise Oracle databases. If possible, we would like to avoid to use a physical HSM or to contract with a third party HSM cloud provider. Is this possible to store the KEK's in GCP or Azure, and to interface our lo...
Categories: DBA Blogs

Migration from oracle 6i and 11g to Oracle APEX

Mon, 2019-11-11 11:49
Dear all, i have oracle forms that are built on 6i and 11g and i want to migrate them to oracle apex, is it possible to create an application based on the oracle 6i form migrated, if so can you provide me with a document or a video showing the pro...
Categories: DBA Blogs

One way Encryption where no one can decrypt

Mon, 2019-11-11 11:49
Hi Tom, Kindly suggest some one way encryption for the data in table,where no one can decrypt it? Read few articles about this and not satisfied. Kindly help.
Categories: DBA Blogs

Connection retry when database services failover

Mon, 2019-11-11 11:49
Hello, Ask Tom, Team. I have a two-node RAC running a database service with one preferred instance and one available instance. It is supposed that RAC automatically failovers the services to available when preferred instance crashes. 1. Will ...
Categories: DBA Blogs

Best Practice using database services

Mon, 2019-11-11 11:49
Hello, Ask Tom Team. We have a two-node RAC running a database. The app connects to the database using scan name (best practice), so we are not using vip to connect to database directly. The tnsnames.ora is: DBPROD = (DESCRIPTION = (ADD...
Categories: DBA Blogs

Impact of Index Monitoring in production server

Mon, 2019-11-11 11:49
Hi, we are planning to change global index to local index for partitioned table in production. Since we need to drop an index and create it again and we don't know the time it will take, we decided to monitor the index which are being used by the app...
Categories: DBA Blogs

Generating DDL in Oracle SQL Developer

Mon, 2019-11-11 11:49
Dear AskTom-Team! Is there a possibility in the Oracle Developer to suppress duplicate DDL code? For example when generating the DDL from my relational model the foreign key constraint is generated twice, i.e. for both tables that are involved in th...
Categories: DBA Blogs

Clustered Indexes

Fri, 2019-11-08 02:48
Is clustered Index is faster than Non-clustered Index?
Categories: DBA Blogs

Platform list on whicb JAVA_JIT_ENABLED paramter can be enbaled

Fri, 2019-11-08 02:48
<b>Question:</b> As my application is using some JAVA function as UDF using <b>loadjava</b>. So, developers are suggesting to set <b>JAVA_JIT_ENABLED</b> parameter as <b>true</b>. I have read (https://docs.oracle.com/cd/B28359_01/server.111/b28320/in...
Categories: DBA Blogs

How can i extract data from a URL string in SQL?

Fri, 2019-11-08 02:48
Hi TOM, i am trying to extract some data from a URL and running into some issues. The URL's will look something like this: http://192.168.201.242:8000/express_get?time=$startDate&from=$phoneNumber&to=$CAMPAIGN&Id_agent=$idExternalUser&spent=$durat...
Categories: DBA Blogs

JAVA CLASSPATH Specificaiton

Fri, 2019-11-08 02:48
Hi, We have an Oracle 10g database running java on the database as java stored procedures. It is hosted on an IBM AIX frame. There are both 64bit and 32bit jvms installed. How do you specify the java classpath for java running in the database? W...
Categories: DBA Blogs

Cursors

Fri, 2019-11-08 02:48
Hi Tom, The Oracle users in the world should be thankful to you for all your help all the way .Many thanks for that. We are learning many things about Oracle that we could not learn by reading several Oracle books (other than your books) though ...
Categories: DBA Blogs

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