Abstract: In various embodiments, a computer-implemented method includes collecting, using biometric sensors, stress data associated with a user of a virtual reality device. The method may also include determining a stress level of the user based on the stress data. The method may also include retrieving historical data of the user. The method may also include monitoring a current environment of the user during a current virtual session. The method may also include identifying a safety hazard during the current virtual session based on the stress data and the current environment. The method may also include determining, using the historical data, virtual scenarios that affect the stress level of the user. The method may also include generating, using the determined virtual scenarios, a safe virtual scenario to eliminate the safety hazard.

Abstract: In various embodiments, a computer-implemented method includes collecting, using biometric sensors, stress data associated with a user of a virtual reality device. The method may also include determining a stress level of the user based on the stress data. The method may also include retrieving historical data of the user. The method may also include monitoring a current environment of the user during a current virtual session. The method may also include identifying a safety hazard during the current virtual session based on the stress data and the current environment. The method may also include determining, using the historical data, virtual scenarios that affect the stress level of the user. The method may also include generating, using the determined virtual scenarios, a safe virtual scenario to eliminate the safety hazard.

Abstract: A respective volatility attribute associated with each of one or more tables of a computerized database is used to adjust an extension file size value associated with a database table file space. Various optional additional uses of a volatility attribute to manage a database are disclosed. Preferably, database parameters are automatically monitored over time and database table volatility state is automatically determined and periodically adjusted.

Abstract: A computer-implemented method for reusing deleted database records includes, receiving, by a database manager executing within a computing device, a first query request to insert, into a database table, a first set of database records. The database manager identifies a first set of entries within a journal log bundle. The database manager also determines, in response to identifying a first set of entries, that there is a third set of deleted database records located on a same page as a second set of database records. The database manager also, in response to determining that there is a third set of deleted database records located on a same page as the second set of database records, inserts into the database table the first set of database records using the third set of deleted database records.

Abstract: A respective volatility attribute associated with each of one or more tables of a computerized database is used to adjust an extension file size value associated with a database table file space. Various optional additional uses of a volatility attribute to manage a database are disclosed. Preferably, database parameters are automatically monitored over time and database table volatility state is automatically determined and periodically adjusted.

Abstract: A method for modifying a presentation of content. The method includes a computer processor determining whether a user of a computing device wears eyewear based, at least in part, on analyzing an image of the face of the user. The method further includes responding to determining that the user wears eyewear, by determining a set of characteristics of the eyewear of the user. The method further includes determining a set of environmental factors in proximity of the user and the computing device. The method further includes modifying a presentation of visual content on the computing device based, on the set of characteristics of the eyewear of the user and the determined set of environmental factors in proximity of the user and the computing device.

Abstract: A method for dynamically and cognitively generating and delivering web build layers for web applications is provided. The method may include receiving, by a computer, file requests associated with web applications. The method may further include, in response to receiving the file requests, identifying resource files associated with the file requests and the web applications by querying, by a computer, at least one application server for the resource files. Additionally, the method may include determining, by a computer, related resource files based on the identified resource files by tracking information and user activity associated with the identified resource files. The method may also include generating web build layers by grouping, by a computer, the determined related resource files. The method may further include delivering the generated optimized web build layers to the web applications based on the tracked information and user activity.

Abstract: A computer-implemented method for determining a query execution plan based on transaction state may include determining that a first set of database values in a database table are in a committed transaction state and that a second set of database values in the database table are in an uncommitted transaction state. In response to the determining, the first set of database values may have a first set of statistics generated and the second set of database values may have a second set of statistics generated. The first and second set of statistics may be for use in determining a query execution plan.

Abstract: A method for dynamically and cognitively generating and delivering web build layers for web applications is provided. The method may include receiving, by a computer, file requests associated with web applications. The method may further include, in response to receiving the file requests, identifying resource files associated with the file requests and the web applications by querying, by a computer, at least one application server for the resource files. Additionally, the method may include determining, by a computer, related resource files based on the identified resource files by tracking information and user activity associated with the identified resource files. The method may also include generating web build layers by grouping, by a computer, the determined related resource files. The method may further include delivering the generated optimized web build layers to the web applications based on the tracked information and user activity.

Abstract: A method for modifying a presentation of content. The method includes a computer processor determining whether a user of a computing device wears eyewear based, at least in part, on analyzing an image of the face of the user. The method further includes responding to determining that the user wears eyewear, by determining a set of characteristics of the eyewear of the user. The method further includes determining a set of environmental factors in proximity of the user and the computing device. The method further includes modifying a presentation of visual content on the computing device based, on the set of characteristics of the eyewear of the user and the determined set of environmental factors in proximity of the user and the computing device.

Abstract: Disclosed aspects relate to query hint management for a database management system. With respect to a hint for a query, a set of hint profile data is established. The database management system detects a triggering event. Based on the set of hint profile data, the database management system determines to perform a hint action in response to the triggering event. Performance of the hint action is initiated.

Abstract: Disclosed aspects relate to transforming a user-defined table function (UDTF) to a derived table in a database management system (DBMS). It may be detected by the DBMS that a query indicates the UDTF. A derived table may be constructed from the UDTF. The derived table may be derived from a set of statements of the UDTF. The derived table may be introduced to the query to fulfill the UDTF. A query plan may be generated for the query by the DBMS. The query plan may be generated in response to introducing the derived table in the query.

Abstract: Disclosed aspects relate to transforming a user-defined table function (UDTF) to a derived table in a database management system (DBMS). It may be detected by the DBMS that a query indicates the UDTF. A derived table may be constructed from the UDTF. The derived table may be derived from a set of statements of the UDTF. The derived table may be introduced to the query to fulfill the UDTF. A query plan may be generated for the query by the DBMS. The query plan may be generated in response to introducing the derived table in the query.

Abstract: A computer-implemented method for determining a query execution plan based on transaction state may include determining that a first set of database values in a database table are in a committed transaction state and that a second set of database values in the database table are in an uncommitted transaction state. In response to the determining, the first set of database values may have a first set of statistics generated and the second set of database values may have a second set of statistics generated. The first and second set of statistics may be for use in determining a query execution plan.

Abstract: A query is received. Based on statistics for a database, a first query access plan is generated for executing the query on the database. A first result set for the query is obtained by implementing the first query access plan on the database. Based on at least one trend in the statistics, a target time after which implementing the first query access plan will fail a set of criteria is forecasted. In response to the forecasting and based on the statistics, a replacement query access plan is generated prior to the target time. After the target time, a second result set for the query is obtained by implementing the replacement query access plan rather than the first query access plan.

Abstract: Disclosed aspects include a temporal relational database management system initiating a set of operations. A set of columns in a transaction time temporal table is identified for change categorization. A change categorization model is constructed. The change categorization model is based on a set of changes with respect to the set of columns in the transaction time temporal table. The change categorization model uses a cluster analysis technique. Based on the change categorization model, a group of change categories for a set of rows coupled with the set of columns in the transaction time temporal table is determined. Based on the change categorization model, a first change category of the group of change categories is established in a first row of the set of rows.

Abstract: A method for managing a database is disclosed. Managing the database includes managing a table of the database, the table having a set of fields including a first field in a first row of the table. Managing the table includes selecting, in the first field, a first input value configured to identify a first dynamic data function utilized to determine a first output value for the first field. Managing the table includes determining the first output value for the first field using the first dynamic data function. Managing the table includes returning (for a read request) the first output value for the first field.

Abstract: Disclosed aspects include a temporal relational database management system initiating a set of operations. A set of columns in a transaction time temporal table is identified for change categorization. A change categorization model is constructed. The change categorization model is based on a set of changes with respect to the set of columns in the transaction time temporal table. The change categorization model uses a cluster analysis technique. Based on the change categorization model, a group of change categories for a set of rows coupled with the set of columns in the transaction time temporal table is determined. Based on the change categorization model, a first change category of the group of change categories is established in a first row of the set of rows.

Abstract: A system and a computer program product for managing a database are disclosed. Managing the database includes managing a table of the database, the table having a set of fields including a first field in a first row of the table. Managing the table includes selecting, in the first field, a first input value configured to identify a first dynamic data function utilized to determine a first output value for the first field. Managing the table includes determining the first output value for the first field using the first dynamic data function. Managing the table includes returning (for a read request) the first output value for the first field.

Abstract: A method, a system, and a computer program product for managing a database are disclosed. Managing the database includes managing an index of a table of the database. Managing the index includes determining the table includes a first field having a first input value configured to identify a first dynamic data function utilized to determine a first output value for the first field. In embodiments, managing the index includes determining the first dynamic data function is deterministic, determining the first output value for the first field using the first dynamic data function, and storing the first output value for the first field. In embodiments, managing the index includes determining the first dynamic data function is nondeterministic, determining a first special value to represent the first output value for the first field, and storing the first special value for the first field.