Lohengrin wagner imslp. An Opera by Richard Wagner Opera in three acts, by Richard Wagner. Lohengrin's premiere was in 1850 with Franz Liszt conducting. Wagner was in exile and could not attend the premiere. The first production was a disappointment, and Wagner began talking about a festival theatre built by himself, an idea that later manifested itself in the Bayreuth Festival House. Lohengrin prays and the swan turns into another form, a young Gottfried. He elects him as the Duke of Brabant. Ortrud sinks as she sees Gottfried and her plans thwarted.A dove descends from heaven and, taking the place of the swan at the head of the boat, leads Lohengrin to the castle of the Holy Grail. Wolfgang Windgassen's not-quite heldentenor is precisely right for Lohengrin, and he sings with sensitivity and authority, in both introspective and public moments.
- Tomcat-pool (which is NOT the default connection-pool in Tomcat) uses maxActive. Also, I am currently using both attributes maxActive and maxTotal in my current server.xml file, which does not appear to be causing any issues. If you use both, you should be all set for whichever pool you use at runtime.
- For some reason the docs are not making sense to me. MaxActive and maxIdle exist on both the apache dbcp and the tomact 7 jdbc-pool according to the docs at maxActive (int) The maximum number of active connections that can be allocated from this pool at the same time. The default value is 100.
Parameters: factory - the PoolableObjectFactory used by created pools. Lastpass security reddit download. MaxActive - maximum number of objects that can be borrowed from created pools at one time. WhenExhaustedAction - the action to take when the pool is exhausted. MaxWait - the maximum amount of time to wait for an idle object when the pool is exhausted. MaxIdle - the maximum number of idle objects in my pool.
Hello,
I am using Tomcat 8.5.11 with JDBC connection pooling. Based on the
documentation it is clear that DBCP pooling has changed the maxActive
attribute to maxTotal. However it is unclear, based on this document
https://tomcat.apache.org/tomcat-8.5-doc/jdbc-pool.html, if JDBC
pooling has also changed maxActive to maxTotal.
Also, I am currently using both attributes maxActive and maxTotal in my
current server.xml file, which does not appear to be causing any issues.
my question is which attribute should I be using?
Thanks
Dave
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Skip to end of metadataGo to start of metadataI am using Tomcat 8.5.11 with JDBC connection pooling. Based on the
documentation it is clear that DBCP pooling has changed the maxActive
attribute to maxTotal. However it is unclear, based on this document
https://tomcat.apache.org/tomcat-8.5-doc/jdbc-pool.html, if JDBC
pooling has also changed maxActive to maxTotal.
Also, I am currently using both attributes maxActive and maxTotal in my
current server.xml file, which does not appear to be causing any issues.
my question is which attribute should I be using?
Thanks
Dave
--
<https://www.primepoint.com/>
David Bothwell
Chairman of the Board, Chief technology Officer | Primepoint, LLC
Address: 2 Springside Road, Westampton, NJ 08060
Phone: 800-600-5257
<https://www.primepoint.com/>-
<https://www.facebook.com/Primepoint.Payroll.HR/>-
<https://www.instagram.com/primepointllc/>-
<https://www.linkedin.com/company/505608?trk=tyah&trkInfo=clickedVertical%3Acompany%2CclickedEntityId%3A505608%2Cidx%3A2-2-3%2CtarId%3A1447790586761%2Ctas%3Aprimepoint>
- <https://twitter.com/primepoint>- <https://vimeo.com/user55649759>
--
This communication, and any information or attachments contained within,
may contain privileged or confidential information that is intended for the
sole use of the recipient or recipients named above. If the reader of this
message is not an intended recipient, or authorized to receive such
messages for an intended recipient, you are hereby notified that any
review, use, dissemination, copying, or distribution of this communication,
or any of its contents is strictly prohibited. If you have received this
message in error, please notify us immediately of the error by return email
and permanently remove the original message, its contents, and any copies
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On this page:
Target audience:
CAST AI Administrators
Summary: it is possible to modify the connection configuration for the CAST Application Engineering Dashboard and the RestAPI to pool multiple CAST Dashboard Service schemas/databases in one resource 'domain'. In other words, you no longer have to configure one resource (in the context.xml) per CAST Dashboard Service 'schema/database', instead, one resource (in the context.xml) can function for multiple CAST Dashboard Service schemas/databases.
Tomcat Maxactive Vs Maxtotal
When configuring a connection for the CAST Application Engineering Dashboard or the RestAPI, each CAST Dashboard Service database/schema that you want to reference requires one UNIQUE<resource> entry in the context.xml file. For example, the following code block shows the configuration required for a Tomcat 7 application server to specify four Dashboard Service schemas (V82_CENTRAL1_CSS_A, V82_CENTRAL2_CSS_A, V81_CENTRAL1_CSS_B, V81_CENTRAL2_CSS_B), two on one CAST Storage Service server and two on another (note that each <resource> has a different 'name' attribute):
This configuration works well when you only need to reference a handful of CAST AIP schemas/RDBMS, however, if you need to reference tens or hundreds of CAST AIP schemas, then it can quickly become arduous to configure each resource manually. In addition, for each resource you configure in the context.xml, a database connection will be opened to the target RDBMS - if the CAST AIP schemas/databases are located on the SAME RDBMS, then multiple connections to that same RDBMS will be opened by the web application, which can impact performance.
In order to simplify the configuration of multiple database connections/resources in the context.xml file and as a direct response to the issues outlined above, CAST has introduced the ability to use a connection pooling feature. This feature is detailed below.
Note about pooling Measurement Service schemas
The connection pooling feature is aimed at pooling multiple CAST Dashboard Service schemas located on the same RDBMS. Whilst technically possible to pool multiple CAST Measurement Service schemas this is not recommended nor supported:
- The CAST Application Analytics Dashboard does NOT support the display of data from multiple Measurement Service schemas, i.e. the dashboard expects one resource named 'AAD'. which must correspond to one single CAST Measurement Service.
- The CAST Report Generator can technically support connections to multiple Measurement Service schemas, however, this configuration is not recommended nor supported.
The connection pooling feature is handled through two specific files in the deployed WAR file:
If you edit either of these files, ensure you restart the web application server so that the changes are taken into account.
domains.properties
The domains.properties file contains the configuration required for each domain. By default this is delivered as follows:
- DOMAIN refers to the name of the domain you are creating. You can use any domain name notation you want, but each domain name must be unique.
- MYRESOURCE refers to the name attribute used in the <resource> tag in the context.xml file. This identifies the connection parameters (as defined in the context.xml file) for the schema/database. This item can be repeated as many times as necessary - each schema that is located on the same RDBMS will use the same MYRESOURCE.
- SCHEMA refers to the name of the CAST Dashboard Service schema you want to connect to.
- The # is used to comment out a line. By default all configuration is commented out and therefore no connection pooling is in effect.
- To avoid database connections errors, please ensure that:
- any empty lines in the domains.properties file are removed
- any white spaces in the domain configuration are removed - for example a space after the comma as in 'DOMAIN1=MYRESOURCE, SCHEMA1' will cause an issue, whereas 'DOMAIN1=MYRESOURCE,SCHEMA1' will not.
In simple terms, you need to create one line (i.e. DOMAIN=MYRESOURCE,SCHEMA) per CAST Dashboard Service schema you need to access in the CAST Application Engineering Dashboard or in the CAST RestAPI. So if you have 200 CAST Dashboard Service schemas:
- you need to enter 200 lines
- if all 200 schemas are on the same RDBMS, then the MYRESOURCE will be identical in each line
- all DOMAIN entries must be unique
context.xml
In the context of the connection pooling feature, the context.xml is used only to define the connection parameters to an RDBMS and the MYRESOURCE item (name attribute used in the <resource> tag). The required format of the <resource> tag is very similar to the format used for a standard connection without connection pooling, except that the CAST Dashboard Service schema/database is not defined at all (i.e. the initConnectionSqls (Tomcat 7) or connectionInitSqls (Tomcat 8/8.5) attributes are not defined). The schema/database is instead defined in the domains.properties file:
Tomcat 7
Tomcat 8 / 8.5
maxActive and maxTotal attributes
Apache Tomcat Maxactive
When configuring connection pooling, CAST highly recommends that you tune the maxActive (Tomcat 7) and maxTotal (Tomcat 8/8.5) attributes in each <resource> tag according to your consumption use case and the number of schemas you are pooling. These parameters govern the maximum number of active connections that can be allocated at the same time. The default value is 20.
Remember that when connection pooling is in use, there is only one <resource> tag for each target RDBMS, so you can increase/decrease the number of active connections to fit your need.
When using the combined CAST-AAD-AED.war file
If you are using the combined CAST-AAD-AED.war file (where you have both Measurement Service and Dashboard Service schemas configured in the context.xml) and you want to use connection pooling for your Dashboard Services, you must ensure you configure the Measurement Service schema connection via the connection pooling mechanism as well otherwise it will be ignored.
For example, you have the following configuration in your context.xml for a Tomcat 7 application server prior to invoking connection pooling:
When you invoke connection pooling for the two Dashboard Service schemas on the FRED CSS server, you need to do the following for the Measurement Service schema:
domain.properties
Note that the DOMAIN for a Measurement Service schema MUST be set to 'AAD' as shown above, otherwise the CAST Application Analytics Dashboard will not function correctly.
context.xml
This example will configure the following four Dashboard Service schemas via connection pooling:
Dasboard Service schema name | CSS name |
---|---|
V82_CENTRAL1_FRED | FRED:2280 |
V82_CENTRAL2_FRED | FRED:2280 |
V81_CENTRAL1_BILL | BILL:2280 |
V81_CENTRAL2_BILL | BILL:2280 |
Standard configuration without connection pooling
Without connection pooling (Tomcat 7/CSS2) you would need to configure the following in the context.xml - one unique <resource> per Dashboard Service schema:
Connection pooling configuration
To convert the above standard configuration to connection pooling:
domain.properties with connection pooling
Ensure each line is uncommented (except for the first) and then configure four unique domains (one for each CAST Dashboard Service schema) and ensure that the MYRESOURCE item is correctly defined: in the example below, there are two MYRESOURCE items, AED1 and AED2 which refer to each RDBMS:
context.xml with connection pooling
You can see that there are now only two <resource> elements:
Tomcat Maxactive Vs Maxidle
- The first one defines MYRESOURCE 'AED1' pointing to the CSS called 'FRED' - two schemas V82_CENTRAL1_FRED and 82_CENTRAL2_FRED are hosted on this CSS
- The second <resource> defines the MYRESOURCE 'AED2' called 'BILL' - two schemas V82_CENTRAL1_BILL and 82_CENTRAL2_BILL are hosted on this CSS